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1. COMMAND PARAMETER DESCRIPTION CHannel 1 Selects the channel module CHannel NONE Returns the current channel e g 8 or 9 Channel all COHerence ON OFF Enables Disables the Coherence Control in all modules COHerence NONE Returns the status of the Coherence Control CONDition NONE Returns the Condition Status Register ENAB COND 1 Sets the enable register for Conditions ENAB COND NONE Returns the Condition Enable Register ENAB EVENT 1 Sets the enable register for Events ENAB EVENT NONE Returns the Event Enable Register ERRors NONE Returns errors generated since last error query EVEnt NONE Returns the Event Status Register FREQuency 1 Internal modulation setpoint in KHz FREQuency NONE Returns the internal modulation frequency in kHz MESsage 1 Used to enter a string message of up to 16 characters MESsage NONE Returns a previously stored ASCII message MODulation ON OFF Turns internal modulation on or off MODulation NONE Returns status of internal modulation OUTput ON OFF Turns all channel outputs on or off OUTput NONE Returns status channel output RADix 1 Used to set the radix type for numerical data RADix NONE Used to return the radix type for numerical data SECURE 1 Used by service personnel to access PUD SOURCE 1 Used to set the source of the modulation signal SOURCE NONE Returns the source of the modulation signal TERM TRUE FALS
2. FIGURE 8 11 FOM 7900B Status Reporting Schematic Diagram Command Timing and Completion This section describes for each device dependent command whether that command is performed in an overlapped or sequential manner In other words it states whether the next command may begin while the present command is being executed or if the next command must wait until the present command is completed before its execution begins All FOM 7900B device dependent commands are executed in an overlapped manner using the operation complete flag The WAI common command is an example of a sequential command which forces the next command to wait until the no operation pending flag is true This is essentially the same as waiting for the OPC flag to become true because the no operations pending flag is used to set the OPC flag bit O of the Standard Event Status Register CHAPTER 8 GPIB Remote Operation and Common Commands Status Reporting 8 25 ILX Lightwave 70032603 Revision 00 In normal operation the overlapped commands execute faster than would appear by querying the OPC flag This is due to the nature of the non volatile memory storage process This is done to ensure that the OPC flag is never set prematurely However in most cases the individual operation will be completed immediately Whenever there is response data in the Output Queue bit 4 is set in the Status Byte R
3. 12 1 Parser Errors renes e arene 12 2 Execution Control Errors 12 3 GPIB Errors d e he fed 12 4 Mainframe Specific Errors 12 4 Module Specific 12 5 FOS 79710 Switch Error Messages 12 5 System 02 2 13 1 GPIB Troubleshooting 13 2 ILX Lightwave 70032603 Revision 00 LIST OF TABLES CONTINUED Table 13 3 FOS 79710 Switch Module Errors Table 13 4 FOS 79800E Source Module Errors Table 13 5 DPM 79810 Dual Power Meter Module Errors XX CHAPTER 1 ILX Lightwave 70032603 Revision 00 INTRODUCTION COMPANY AND TECHNOLOGY OVERVIEW ILX Lightwave is a market and technology leader in the manufacture of photonic test and measurement instrumentation ILX Lightwave s global customer base is comprised of leading manufacturers of fiber optic telecommunications systems and components ILX Lightwave serves customers from five strategically located manufacturing sales and service centers in the United States Canada Japan and Europe In keeping with its commitment to product leadership and business growth ILX Lightwave continuously introduces new products that are designed to offer customers long term benefits such as manufacturing yield enhancement greater
4. CAUTION Do not insert or remove any module while the FOM 7900B is powered up This could damage the module and or mainframe Be sure the module is properly installed before applying power to the FOM 7900B CAUTION RISK OF ELECTRICAL SHOCK DO NOT OPEN VORSICHT HOCHSPANNUNG NICHT OFFNEN ATTENTION RISQUE D ELECTROCUTION NE PAS OUVRIR ATTENZIONE RISCHIO DI SHOCK ELECTRICO NON APRIRE CONNECT THE INSTRUMENT TO A PROPERLY EARTH GROUNDED THREE PRONG RECEPTACLE ANSHLIESS DAS INSTRUMENTIERE BIS EIN ANGEBRACHT ERDE GROUNDED DREIPRONG RECEPTACLE ABOUCHENT LA INSTRUMENT POUR CONVENABLE EARTH GROUNDED TROIS PRONG RECEPTACLE CONNECT GLI STRUMENTANO A UN PROPER TERRA GROUNDED TRE PRONG RICETTACOLO CHAPTER 11 Maintenance 11 1 ILX Lightwave 70032603 Revision 00 FUSE REPLACEMENT Fuses are accessed from the rear panel of the FOM 7900B Before replacing the fuses turn the power off and disconnect the power cord Then remove the fuse holder with a regular screwdriver Only use fuses rated for the power line voltage in your area as indicated on the rear panel LINE VOLTAGE FUSE 5 X 20mm a T 2 0A 250V 1 1 6A 250V NOTE FOR CONTINUED PROTECTION REPLACE FUSE ONLY WITH SPECIFIED TYPE AND RATING ZUM FORTBESTEHENDEN SCHUTZ ERSETZEN SIE DIE SICHERUNG NUR MIT DEM SPEZIFIZIERTEM TYP AND NENNWE
5. External Trigger Specification Parameter Level TTL Normally high 5 volts Edge Active Low triggers on high to low transition Pulse Width 100 ns minimum Latency 500 ms absolute maximum time between trigger edge amp complete stability of optical signal Switching Frequency 2 0 Hz maximum triggers above this rate will produce maximum switching frequency For every trigger pulse or TRIG command sent to the FOM 7900B the switch will move to the next port in the switch sequence array Trigger pulses occurring at a frequency higher than the maximum will produce the maximum switch rate CHAPTER 6 FOS 79710 Module External Trigger Specifications 6 9 ILX Lightwave 70032603 Revision 00 6 10 Table 6 4 FOS 79710 1 x 4 Switch Module Commands NAME PARAMETER DESCRIPTION ERR NONE Returns an error code See CHAPTER 12 IDN NONE Returns a string that identifies the module INTERVAL Sets the timer interval in seconds INTERVAL NONE Returns the timer interval in seconds PORT Sets the port that is switched to the common port PORT NONE Returns the currently selected switch port SEQ DEFAULT NONE Initializes the Trigger Timer switch sequence SEQ SWn Sets the nth position in the switch sequence array SEQ SWn NONE Returns the nth position from the sequence array SEQ TMR ON OFF Enables or Disables the Interval Time
6. 8 4 hlto s rente RR 8 4 PROGRAM MESSAGE TERMINATOR 8 5 PROGRAM MESSAGE UNIT SEPARATORS 8 5 PROGRAM HEADER SEPARATOR 8 6 compound command program header 8 6 PROGRAM DATA Parameters 8 7 ARBITRARY BLOCK PROGRAM DATA 8 8 PROGRAM DATA SEPARATORS 8 8 Power On Conditions 8 9 Default Parameters 5 ett ge eia Ee eden 8 9 xiii ILX Lightwave 70032603 Revision 00 Getting Started with GPIB ssssesem em 8 10 Overview of the FOM 7900B Syntax 8 10 Using Commands with Parameters 8 11 Substitute Parameter 8 11 QUICTIOS 2 t pedis uU qe de b peu 8 12 x2 rie eon EUM 8 12 Common Commands and Queries sess 8 13 Error Messages i i e e eU a E ee RR M ec LL ode 8 24 Status Reporting itte tte tr ete tee de etat 8 24 Device Dependent Event and Condition Registers 8 24 Operation Complete Definition 8 25 Command Timing and Com
7. 5 9 Mode of Operation 2 5 10 Display POWO oiii te Ue En e coa see Een I oe EARLIER 5 10 Operating Parameters Setup 5 11 Recall Stored Setup Parameters 5 11 Source Wavelength eese netten nnns 5 12 xi ILX Lightwave 70032603 Revision 00 CHAPTER 6 xii Filtering Value Averaging Rate 5 12 Measurement Units 5 12 Reference Power Reading 5 13 Range Setting recondit 5 13 User Calibration bud 5 14 Save Setup Parameters 5 14 Request End Setup 5 14 Warnings 5 15 OPERATING IN REMOTE CONTROL 5 15 Remote 5 15 Terminology e ep eos 5 15 COMMAND REFERENCE 1 4 eee mere 5 16 FOS 79710 MODULE FOS 79710 Parameters 6 3 Module Identification 6 4 Select Switch Port 6 4 Select External Trigger 6 4 Enable External 6 5 Initialize Trigger Switch Sequence 6 5 Customize Trig
8. 1 Module 1 Present 256 Modulation On 2 Module 2 Present 512 Sources On 4 Module 3 Present 1024 Not Used 8 Module 4 Present 2048 Not Used 16 Module 5 Present 4096 Not Used 32 Module 6 Present 8192 Not Used 64 Module 7 Present 16384 Not Used 128 Module 8 Present 32768 Not Used The condition enable register can be read using the ENABle COND query The condition status register can be monitored using the COND query If any of the enabled bits in the Condition Register are true bit 1 of the Status Byte is set Refer to the Status reporting diagram in FIGURE 8 11 The enable registers retain their values at power up unless the power on status clear flag is set true see PSC in CHAPTER 8 ENAB COND 513 Allows an SRQ interrupt to be sent to the computer when any Sources are turned on or if Module 1 is present CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 Front Panel ENABle COND Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The ENABle COND query returns the value of the FOM 7900B status condition enable register Oe PARAMETERS None SYNTAX DIAGRAM RESPONSE lt response data gt lt response terminator gt where the response data is the binary sum of the following 1 Module 1 Present 256 Modulation On 2 Module 2 Present 512 Sources On 4 Module 3 Pres
9. 3 40 8 16 CHAPTER 8 GPIB Remote Operation and Common Commands Common Commands and Queries ILX Lightwave 70032603 Revision 00 OPC The OPC command causes the device to generate the OPERATION COMPLETE message in the Standard Event Status Register when all pending commands have been completed Refer to FIGURE 8 9 HS SYNTAX OPC The OPERATION COMPLETE QUERY places an ASCII character 1 into the FOM 7900B s Output Queue when all pending operations have been finished RESPONSE 1 when all overlapped commands complete SYNTAX CHAPTER 8 GPIB Remote Operation and Common Commands Common Commands and Queries 8 17 ILX Lightwave 70032603 Revision 00 8 18 SYNTAX PSC The POWER ON STATUS CLEAR command controls the automatic power on clearing of the Service Request Enable Register SRE Standard Event Status Enable Register ESE Event Status Enable Register ENAB EVE Condition Status Enable Register ENAB COND ENAB EVE ENAB COND This may be used to avoid undesirable service requests when the device is powered up e where the lt integer nrf gt is a boolean value 0 Power on status clear flag is set false therefore allowing SRQ interrupts after power on 1 Power on status clear flag is set true therefore clearing all enable registers and disallowing SRQ interrupts to be asserted after power on CHAPTER 8 GPIB Remote Operation
10. 401 Channel number out of range 0 to 9 legal 402 Bank address number out of range 0 to 24 legal 403 Internal modulation frequency out of range 1 to 500 kHz legal 404 Command or query sent to empty channel no module installed in channel CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 23 ILX Lightwave 70032603 Revision 00 POINTS OF INTEREST EXAMPLES SYNTAX DIAGRAM PARAMETERS RESPONSE The response data is a list of the current error codes represented by numbers and separated by commas A response of zero indicates that there are no errors to report The response is sent as character data The error query should be directed to the mainframe or specific module by issuing the CHan command first When the error queue is active errors exist bit 7 in the Status Byte is set to one ERR 0 there are no errors to report ERRORS 403 the internal modulation frequency is out of range Front Panel EVEnt Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The EVEnt query returns the value of the FOM 7900B status event register pope None response data response terminator 9 24 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 where the response data is the binary sum of the following VALUE
11. PARAMETER SPECIFICATION Fiber Type 9 125 SMF 28 Wavelength Range 1280 1650 nm Connector Type FC APC Insertion Loss 1 2 dB typical 1 7 dB maximum Crosstalk 80 dB Polarization Dependent Loss lt 9 05 dB Repeatability4 0 03 dB Switching Time 16 ms channel 300 ms maximum Maximum CW Input Power 24 dBm Return Loss gt 55 dB Switch Life 10 million cycles minimum Operating Temperature 15 C to 35 C Operating Humidity lt 85 relative humidity non condensing Storage Temperature 20 C to 70 C Dimensions H W D 12 8 x 3 5 x 29 0 cm 5 x 1 4 x 11 4 in Module Weight 0 8 kg 1 8 Ib 1 Measured at 23 5 C 2 Maximum insertion loss any module output port 3 Measured at 1550 nm 4 Sequential switching 100 cycles measured at constant temperature after module warm up 5 Excluding GPIB and mainframe processor latency When enabled the FOS 79710 Fiber Optic Switch Module responds to an external trigger signal on the rear panel of the FOM 7900B Mainframe CHAPTER 6 FOS 79710 Module ILX Lightwave 70032603 Revision 00 FOS 79710 PARAMETERS For FOM 7900B system commands refer to Mainframe Parameter Menu on page 3 4 The FOS 79710 1 x 4 Fiber Optic Switch Module menu is shown in Table 6 2 A selection is made by repeatedly pressing the PARAM key until the des
12. In Trigger or Timer modes the port number shown reflects the last manually selected port This menu can be used to override the current output port in these modes However this action may have unintended consequences for your particular application and we suggest you avoid overriding the Trigger or Timer modes Select External Trigger CH1 TRIGGERED MODE PRESS ENTER Press the ENTER key to proceed to the secondary menu structure specific to the control of the external triggering features of the Switch Module 6 4 CHAPTER 6 FOS 79710 Module FOS 79710 Parameters ILX Lightwave 70032603 Revision 00 Enable External Trigger CH1 TRIGGER ENABLE ENABLE Use this parameter to enable or disable the effects of the external trigger signal from the FOM 7900B rear panel Use the UP or DOWN arrow keys to ENABLE or DISABLE the external trigger then press ENTER to activate the change For laser safety reasons the FOS 79710 Switch Module always powers up with Trigger mode disabled When the external trigger is enabled the module will automatically move the switch position to the next port in the sequence whenever a trigger signal is received at the FOM 7900B rear panel or when the TRIG command is sent through GPIB The Trigger and Timer Modes are mutually exclusive if the Trigger Mode is ENABLEd the Timer Mode will be DISABLEd Initialize Trigger Switch Sequence CH1 SEQUENCE 1 gt 4 PRESS ENTER Press the EN
13. Module 3 Present amp gt 6 Module 4 Present Ne L N A Module 5 Present N A Module 6 Present N A Module 7 Present N A Module 8 Present N A Modulation On Modulation On Off Sources On Sources On Off N A N A N A N A N A N A 15 401312 11010 213 N A hshapash2nhhoreTeDz e 5 4 T3 T2 To N A Event Status Enable Register 15 N A ENAB EVE ENAB EVE Power Condition Status Enable Register N A ENAB COND ENAB COND Standard Event Status Register ESR Status Byte Register STB 716 15 l4 31211 Operation Complete Request Control Event Summary 25 3 Query Error amp T Condition Summary 95 Device Dependant Error amp amp Execution Error Message Available Command Error ENG User Request TUNE Event Status Summary Power On Request Service Master 7 6 5 s 2 1 To Status Summary 514 0 Standard Event Status Error Available Enable Register Service Request Enable Register ESE ESE SRE Output SRE Queue
14. SHUTTER 1 The source shutter is opened SHUTTER OFF The source shutter is shut SHUTTER 0 The source shutter is shut X Front Panel SHUTTER Remote FOM 7900B x4 FOS 79800E FOS 79710 DPM 79810 The SHUTTER query returns the state of the source shutter 1 for open and 0 for shut The SHUTTER command is used to open and shut the source shutter option The normal state upon power up of the source shutter is OPEN SYNTAX DIAGRAM RESPONSE response data response terminator where the response data represents the state of the source shutter 1 for OPEN and 0 for SHUT CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 55 ILX Lightwave 70032603 Revision 00 POINTS OF INTEREST This command returns state of the source shutter The state of the shutter is set with the SHUTTER command and the laser is energized with the OUT command EXAMPLES SHUTTER 1 means the source shutter is open SHUTTER 0 means the source shutter is shut v Front Panel SHUTPRES Remote FOM 7900B Y FOS 79800E FOS 79710 DPM 79810 The SHUTPRES query is used to determine if a shutter has been installed in a module present or not present The SHUTTER query returns the state of the source shutter open or shut The SHUTTER command is used to open and shut the source shutter option The normal state upon power up of the source shutter is open SYNTAX DIAGRAM RESPONSE response dat
15. 3 Contact ILX Lightwave for packing and shipping instructions The original shipping container must be used NOTE The shipping box and packing material have been designed specifically for each product and should be saved for possible transportation at a later date Claims for Shipping Damage 4 Send the instrument transportation pre paid to ILX Lightwave refer encing the return authorization number We suggest that you insure the shipment Repairs will be made and the instrument returned transportation pre paid Repairs are warranted for the remainder of the original warranty or for 90 days whichever is greater When you receive the instrument inspect it immediately for any damage or shortages on the packing list If the instrument is damaged file a claim with the carrier ILX Lightwave can supply you with a quotation for estimated costs of repair You must negotiate and settle with the carrier for the amount of damage ILX Lightwave 70032603 Revision 00 ILX Lightwave 70032603 Revision 00 Copyright This document and the software described in it are copyrighted by ILX Lightwave with all rights reserved The document may not be copied in whole or in part without the written consent of ILX Lightwave No Warranty This document has been prepared for use by ILX Lightwave customers as a guide to the proper use and operation of its products and no warranty or representation either expressed or im
16. OPMn RECALL Restores the saved bin contents from the storage bin indicated by the parameter The valid parameter range for this command is 1 10 CHAPTER 5 DPM 79810 MODULE COMMAND REFERENCE CHAPTER 6 ILX Lightwave 70032603 Revision 00 FOS 79710 MODULE Refer to CHAPTER 2 System Overview for installation instructions CAUTION Do not insert or remove any module while the FOM 7900B is powered up This could damage the module and or mainframe Be sure the module is properly installed before applying power to the FOM 7900B CAUTION The Fiber Optic Source Module is a static sensitive device Installing or removing any module from the FOM 7900B System should take place at an ESD protected workbench The operator should be properly earth grounded The FOS 79710 Fiber Optic Switch Module must be used with the FOM 7900B Mainframe It is designed to connect a single fiber optic signal to one of four possible channels The modules are optically transparent to signal formats and bandwidths as well as being bi directional in operation Random sequential or triggered switching modes enhance switch module functionality The optical and mechanical performance specifications for the FOS 79710 Fiber Optic Switch Module are shown in Table 6 1 CHAPTER 6 FOS 79710 Module 6 1 ILX Lightwave 70032603 Revision 00 6 2 Table 6 1 FOS 79710 Performance Specification
17. System Troubleshooting Guide GPIB Troubleshooting Guide ILX Lightwave 70032603 Revision 00 XV ILX Lightwave 70032603 Revision 00 page left blank intentionally xvi LIST OF FIGURES xvii FIGURE 2 1 FIGURE 5 1 FIGURE 7 1 FIGURE 8 1 FIGURE 8 2 FIGURE 8 3 FIGURE 8 4 FIGURE 8 5 FIGURE 8 6 FIGURE 8 7 FIGURE 8 8 FIGURE 8 9 FIGURE 8 10 FIGURE 8 11 FIGURE 9 1 ILX Lightwave 70032603 Revision 00 FOM 7900B Fiber Optic System Rear Panel 2 4 Sample Detector Response 5 2 FOM 7900B Stacked 7 3 White Space Syntactic 8 4 Suffix Syntactic 8 4 PROGRAM MESSAGE TERMINATOR 8 5 PROGRAM MESSAGE UNIT SEPARATOR 8 5 compound command program headers 8 6 compound query program gt 8 7 ARBITRARY BLOCK PROGRAM 8 8 PROGRAM DATA gt 8 8 Standard Event Status Status Enable Register 8 15 Service Request Enable Register 8 22 FOM 7900B Status Reporting Schematic Diagram 8 25 Command Format sss 9 3 ILX Lightwave 70032603 Rev
18. 8 4 lt white space gt lt nrf value gt lt suffix unit gt White space is defined by the syntactic diagram shown in FIGURE 8 1 where lt white space character gt is defined as a single ASCll encoded byte in the range 00 09 0 20 0 9 11 32 decimal This range includes the ASCII control characters carriage return and the space but excludes the new line character In most practical programming situations the space character space bar would be used as white space White space is generally used to separate syntactic elements and is processed without interpretation character gt FIGURE 8 1 White Space Syntactic Diagram The symbol lt nrf value gt refers to the flexible numeric representation as defined by the IEEE 488 2 standard This means that numbers may be represented in one of three forms integer floating point or engineering scientific notation All of the following are equal nrf values 20 20 20 0 20 0 2 0E 1 2 0E 1 2 0e 1 2 0e 1 The symbol lt suffix unit gt refers to the suffix program data that may follow an lt nrf value gt If the suffix is not used a default suffix is assumed The device interprets any alpha characters following decimal data as a suffix without regard to upper lower case Suffixes are not utilized in the FOM 7900B System FIGURE 8 2 Suffix Syntactic Diagram lt white space gt CHAPTER 8 GPIB Remote Operation and Common Commands ANSI IEEE 488 2
19. FIGURE 5 1 Sample Detector Response 5 2 CHAPTER 5 DPM 79810 MODULE ILX Lightwave 70032603 Revision 00 The detector response is shown as photodetector current amperes per unit of optical power watts If you are familiar with normal InGaAs detector responsivity values you may also note that these values are reduced by the loss in the DPM 79810 integrating cavity Note also The highest detector current greatest sensitivity is at the longer wave lengths normally used for telecom work Changes in detector response are significant enough that the meter must use the wavelength in order to display calibrated optical power The flatness or steepness of the curve at any point is a measure of how much effect an error in wavelength input will have on the measure ment result Detector response is less at shorter wavelengths CHAPTER 5 DPM 79810 MODULE 5 3 ILX Lightwave 70032603 Revision 00 DPM 79810 SPECIFICATIONS Performance specifications for the DPM 79810 Dual Power Meter Module are shown Table 5 1 In keeping with our commitment to continuing improvement ILX Lightwave Corporation reserves the right to change specifications without notice or liability for such changes Table 5 1 DPM 79810 MODULE SPECIFICATIONS SPECIFICATIONS DPM 79810 DUAL POWER METER MODULE Wavelength range 850 to 1650nm Power range Measurement Damage Threshold 30 to 40dBm gt 40dBm Accur
20. POINTS OF INTEREST EXAMPLES ILX Lightwave 70032603 Revision 00 BOTH REF 0 0 Indicates that both optical power meters are not operating in reference mode OPM1 REF 1 The first optical power meter is operating in reference mode X Front Panel RELative Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The OPM1 RELative query returns the current optical power difference between the first optical power meter and the second optical power meter None The response is lt nrf value gt When using OPM2 with this command the optical power will be reported as the difference between the second optical power meter and the first optical power meter In dBm mode the response will be indicated with a suffix of DB OPM1 REL 13 584DB Indicates that the mode for first optical power meter is set to DBM and the measured optical power between OPM1 and 2 is 13584dB OPM1 REL 2 79565E 006 The mode for the first optical power meter is set to WATTS and the measured optical power between OPM1 OPM2 is 2 79565mW CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 47 ILX Lightwave 70032603 Revision 00 SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES 9 48 X Front Panel SAVE Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The OPM1 SAVE command stores the user settings for the selected optical power meter to a storage bin for recall an
21. ing rails on the top and bottom of the mainframe bay 4 Press the module firmly into the bay The module should snap securely into place 5 Secure the module using the screw at the bottom left corner of the front panel CHAPTER 11 Maintenance Module replacement 11 3 ILX Lightwave 70032603 Revision 00 FOS 79800E AND FOS 79710 MODULE MAINTENANCE The FOS 79800E Fiber Optic Source Module and the FOS 79710 1 x 4 Fiber Optic Switch Module should not require maintenance however the fiber optic connectors may become contaminated with foreign material Cleaning Fiber Optic Connectors 1 2 11 4 Turn off the power switch and unplug the main frame Loosen the module front panel screw at the bottom center of the mod ule and grasp the module handle Pull the module outward from the mainframe chassis Remove the two 2 sockethead cap screws that hold the fiber con nector bulkhead on the front panel of the module Remove the bulk head and allow the internal fiber connector to protrude through the hole in the front panel where the bulkhead was located Unscrew one of the internal fiber connectors from the connector bulk head It is recommended that only one fiber be disconnected at a time to avoid getting the fibers in the wrong place after cleaning Clean the fiber ferrule by gently wiping the end with a soft tissue wet ted with methanol or similar fiber optic cleaning equipment Screw the fiber ferrule to the connec
22. 70032603 Revision 00 page left blank intentionally 1 4 CHAPTER 1 INTRODUCTION Summary of Instruction Manual CHAPTER 2 SYSTEM OVERVIEW FOM 7900B SYSTEM CHARACTERISTICS Power Input Rack Mounting Weight Height Depth Width Maximum Relative Humidity Operating temperature range Storage temperature range Maximum altitude Chassis Ground ILX Lightwave 70032603 Revision 00 100 120VAC 50Hz 60Hz 1 5 220 240VAC 50 2 60 2 0 8 19 48 3cm 28165 12 7Kg 5 5 14 0cm 17 5 44 5cm 17 75 45 1 lt 90 relative humidity non condensing 0 C to 40 C 40 C to 70 C 3 000 meters 4mm Banana jack Suitable for continuous operation Ordinary Protection Not protected against harmful ingress of moisture Class 1 Equipment Grounded Type Indoor use only NOTE The mains supply voltage is factory set and cannot be changed by the user If a change is required contact ILX Lightwave Customer Service 1 Permitted fluctuations in rated line voltage of 6 and 10 2 Operating temperature range may vary for individual modules CHAPTER 2 System Overview 2 1 ILX Lightwave 70032603 Revision 00 FOM 7900B SYSTEM SPECIFICATIONS Internal Modulation Waveform Frequency Duty Cycle Modulation Depth Rise Fall time Channel to Channel Synchronization Modulation In Level Frequency Duty Cycle Polarity Optical Delay Channel to Chan
23. ILX Lightwave 70032603 Revision 00 SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES SYNTAX DIAGRAM PARAMETERS 9 12 X Front Panel CAL WAVE Remote FOM 7900B x4 FOS 79800E FOS 79710 DPM 79810 The CAL WAVE command is used to field calibrate the wavelength setting The nrf value is the actual measured wavelength from the module The User Calibration can be used when the measured wavelength does not match the front panel setting Use the CAL WAVE command to enter the measured wavelength in nanometers The effects of the User Calibration are removed with the CAL RESET command CAL WAVE 1555 230 The measured wavelength is 1555 230 nm X Front Panel CHannel X Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The CHannel command is used to select a module channel number for future commands queries The nrf value is an integer between 0 and 249 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 POINTS OF INTEREST Zero is the channel selection for mainframe specific commands to bank address zero Select channel 0 to set parameters specifically to the mainframe The channel numbers for the FOM 7900B System are determined as shown in Table 9 5 Table 9 5 FOM 7900B Channel Numbers BANK CHANNEL NOTES 0 0 Bank 0 mainframe only commands 0 1 8 Specific modules in bank 0 0 9 All channels
24. and must be used to separate the command header from the first parameter or program data For more information refer to the IEEE 488 2 standard definition lt white space gt on page 8 4 Examples of valid syntax for commands with the FOM 7900B are shown in Table 8 3 Table 8 3 Valid Syntax for Commands ENAB COND 256 enable event 256 IDN CHAPTER 8 GPIB Remote Operation and Common Commands Getting Started with GPIB ILX Lightwave 70032603 Revision 00 Examples of invalid syntax for commands are shown in Table 8 4 These command strings would produce an error Table 8 4 Invalid Syntax for Commands INVALID SYNTAX ERROR VALID SYNTAX ENAB COND 13 Missing colon between ENAB COND 13 program headers CHAN 2 LEVEL Missing semicolon CHAN 2 LEVEL between commands ERR Space not allowed before ERR question mark LVL Letters must be in the LEVEL correct order Using Commands with Parameters Some commands expect a parameter For example to adjust the internal modulation frequency to 100 kHz the command would be FREQ 100 00 If a single parameter is expected it should follow the command with one space between the command and the parameter Substitute Parameter Names For clarity in programming the Boolean values of one and zero may also be represented by the appropriate substitute parameter names as shown in Table 8 5
25. command Refer to the Status reporting diagram in FIGURE 8 11 ENAB EVE 512 the Sources ON or OFF events are allowed to be summarized in the Status Byte X Front Panel ERRor X Remote Y FOM 7900B Y FOS 79800E Y FOS 79710 DPM 79810 The ERRor query returns a list of command execution and device errors which have occurred since the last ERRor query or CLS command The error codes are listed in Table 9 6 Table 9 7 and Table 9 8 Each module has its own separate error queue Soro None lt response data gt lt response terminator gt 9 22 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 where each lt response data gt consists of an error code value Table 9 6 Error Codes for the FOS 79710 1 X 4 Switch Module ERROR CODE DESCRIPTION 123 Command Syntax Error 201 Value Out of Range Error 220 Parameter Missing Error 504 Switch Mechanism has failed Table 9 7 Error Codes for the FOS 79800E Source Module ERROR CODE DESCRIPTION 123 Command Syntax Error 501 Laser Diode Case Temperature Control Error 502 Laser Diode Internal Temperature Control Error 503 Laser Diode Current Limit Error 508 Calibration Data Error 509 Set point Data Error Table 9 8 Mainframe Specific Errors ERROR CODE EXPLANATION
26. response terminator where the response data is an ASCII string 16 bytes long POINTS OF INTEREST The response data will be a 16 byte long string If there is no previously stored message the response will be all spaces The message is entered using the MESsage command EXAMPLES MES Test3 the previously stored message was Test3 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 33 ILX Lightwave 70032603 Revision 00 X Front Panel MODE X Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The MODE sets the optical power meters to operate in absolute or relative mode SYNTAX DIAGRAM PARAMETERS An lt nrf value 1 Absolute 2 Relative OPM1 OPM2 3 Relative 2 1 POINTS INTEREST This feature only modifies how the front panel will display the measured power All three measurements are available through GPIB regardless of the mode setting EXAMPLES MODE 2 Sets the front panel to display the difference in optical power between the first optical power meter and the second optical power meter X Front Panel MODE X Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The MODE query returns the current mode of operation for the front panel displayed power SYNTAX DIAGRAM core 9 34 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference PARAMETERS POINTS OF INTEREST EXAMPLES SYNTAX DIAGRAM PARAMETERS POINTS OF I
27. 2 79565E 006 The mode for the first optical power meter is set to WATTS and the measured optical power is 2 79565uW CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 Front Panel RADix Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The RADix command allows the programmer to select the radix type for status condition and event query response data Decimal binary hexadecimal and octal are allowed SYNTAX DIAGRAM PARAMETERS Character program data is expected as shown above POINTS OF INTEREST DECimal is the default type Only the first three letters of the words decimal hexadecimal binary or octal are required When the RADIX is selected all status condition and event queries will return values in the new radix In the cases where the radix is not DECimal the flexible numeric type nrf value as shown in the Command Reference diagrams will be replaced by HEX BIN or OCT representation All of the above radixes may be used to enter program data at any time without the need for issuing the RADix command The proper prefix must also be used with Hex binary B or octal 0 This command may be useful for setting up status reporting blocks The bit wise status representation may be more easily read in BIN HEX or OCT EXAMPLES RAD DEC the decimal radix is selected rad hex ESR 42H80 hexadecimal radix is selected and power o
28. 79810 Dual Power Meter Module occupies two bays CAUTION Do not insert or remove any module while the FOM 7900B is powered up This could damage the module and or mainframe Be sure the module is properly installed before applying power to the FOM 7900B CAUTION The Fiber Optic Source Module is a static sensitive device Installing or removing any module from the FOM 7900B System should take place at an ESD protected workbench The operator should be properly earth grounded The DPM 79810 Dual Power Meter Module contains two individual optical power meters Each power meter can be operated independently or the meters can be set to operate in a relative mode providing the difference in optical power between the two Each individual meter is capable of measuring a maximum of 1 Watt of optical power Annual factory calibration is recommended for best performance of the DPM 79810 Dual Power Meter Module Warm up and Environmental Considerations To achieve rated accuracy let the DPM 79810 warm up for at least five minutes before use Operate the meter within the environmental limits specified in Table 5 1 Measuring Higher Power The DPM 79810 will accurately measure input power up to 1W The best way to measure higher power is to use a calibrated attenuator To set a compensating factor into the DPM 79810 so it displays the correct power of the source use USER CALIBRATION CHAPTER 5 DPM 79810 MODU
29. 8192 Not Used 64 Module 7 Present 16384 Not Used 128 Module 8 Present 32768 Not Used POINTS OF INTEREST The condition status may be constantly changing This register is not cleared set to zero when queried or when the CLS command is sent In other words this register always reflects the real time condition of the instrument The conditions above are filtered by the condition enable register See ENABle COND before being summarized in the status byte Refer to the status reporting diagram in FIGURE 8 11 EXAMPLES COND 97 Modules 1 6 and 7 are present Front Panel ENABle Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The ENABle command path is used to access the FOM 7900B status enable commands The following commands can be reached by first specifying the ENABle command path ENABle CONDENABle EVEnt ENABle COND ENABle EVEnt CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 17 ILX Lightwave 70032603 Revision 00 SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES 9 18 Front Panel ENABle COND Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The ENABle COND command sets the condition status enable register This register is a filter which is logically ANDed to the condition register If the result is non zero bit 1 in the Status Byte is set The nrf value whose sum represents the enabled bits below
30. 9 7 ILX Lightwave 70032603 Revision 00 Table 9 4 DPM 79810 Module Commands NAME PARAMETERS FUNCTION OPMn REFerence NONE Returns the reference power BOTH REFerence measurement 0 0 is the default value and indicates no stored reference is being used OPMn RELative NONE Returns the relative power difference between and the other optical power meter OPMn UNITS DBM 1 Sets the optical power meter to BOTH UNITS DBM display and respond in dBm units or Watts OPMn UNITS DBM NONE Returns the current unit setting for the BOTH UNITS DBM optical power meter OPMn WAVEIength 1 Sets the input wavelength that the BOTH WAVElength optical power meter is reading OPMn WAVElength NONE Returns the current wavelength BOTH WAVElength setting for the optical power meter OPMn ZERO NONE Zeros the optical detector and BOTH ZERO electronics for the optical power meter OPMn ZERO NONE Returns the status of the zeroing BOTH ZERO operation on the optical power meter OPMn SAVE 1 Saves the current meter settings for both OPM1 and OPM2 to a storage bin indicated by the parameter The valid parameter range for this command is 1 10 OPMn RECALL Restores the saved bin contents from the storage bin indicated by the parameter The valid parameter range for this command is 1 10 9 8 CHAPTER 9 Command Reference Device Specific Commands ILX Lightwave 70
31. Front Panel SEQ TRG X Remote FOM 7900B FOS 79800E Y FOS 79710 DPM 79810 The SEQ TRG command is used to enable or disable the external trigger mode SYNTAX DIAGRAM PARAMETERS The nrf value is a 1 or a 0 to enable or disable the external trigger POINTS OF INTEREST Use this command to enable or disable the effects of the external trigger signal When the external trigger is enabled the module will automatically move the switch position to the next switch in the sequence whenever a trigger signal is received at the FOM 7900B rear panel or when the TRIG command is sent through GPIB 9 52 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 EXAMPLES SEQ TRG 0 The external trigger is disabled SEQ TRG ON The external trigger is enabled X Front Panel SEQ TRG X Remote FOM 7900B FOS 79800E x FOS 79710 DPM 79810 The SEQ TRG query returns the state of the external trigger mode enabled or disabled PO gt PARAMETERS None SYNTAX DIAGRAM RESPONSE lt response data gt lt response terminator gt where the lt response data gt is a 0 or 1 if the external trigger is disabled or enabled POINTS OF INTEREST Use this command to query the status of the external trigger When the trigger is enabled the module will automatically move to the next switch in the sequence whenever a trigger signal is received at the FOM 7900B rear pan
32. Instructs the first optical power meter to abort the zeroing operation CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES ILX Lightwave 70032603 Revision 00 X Front Panel ZERO Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The BOTH ZERO and OPM1 ZERO queries return the status of the zeroing operation None The response is an nrf value 1 in process 0 complete Once a zeroing operation is initiated it is necessary to ensure that it has been completed before continuing on to make measurements The Zero Operation takes approximately 10 seconds BOTH ZERO 1 0 Indicates that the first optical power meter is in the process of the zeroing operation and the second optical power meter is not in the process of the zeroing operation OPM1 ZERO 1 The first optical power meter is in the process of the zeroing operation CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 73 ILX Lightwave 70032603 Revision 00 page left blank intentionally 9 74 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 CHAPTER10 PROGRAMMING EXAMPLES This section provides examples of programming the FOM 7900B using GPIB These examples are written in QuickBASIC for the National Inst
33. L4 Listener Functions SR1 Service Request complete capability RL1 Remote Local Function complete capability PPO Remote Configuration Parallel Poll no capa bility DCO Device Clear no capability DT1 Device Trigger complete capability CO Controller Function no capability E1 E2 Three state bus drivers with automatic switch to open collector during Parallel Poll Other GPIB features include A concise and straightforward command set Full serial poll capability with SRQ Full local remote capability including LOCAL LOCKOUT This chapter is divided into three parts The first part contains information for getting started using GPIB It also contains the syntax for each 488 2 common command which is supported by the FOM 7900B The second part contains information on status reporting The third part contains information on remote interface messages which generally transparent to the user CHAPTER 8 GPIB Remote Operation and Common Commands 8 1 ILX Lightwave 70032603 Revision 00 7900 AND GPIB CONTROLLER SYNCHRONIZATION To ensure that the 7900 instrument is synchronized with the computer while under GPIB control follow each command with a query It is imperative that the response to the query is read by the computer This effectively forces the computer to wait for the response to the query before transmitting the next command Since every 7900 command is sequential the instrument will not return a quer
34. Operation Mainframe Parameter Menu ILX Lightwave 70032603 Revision 00 CHAPTER 4 FOS 79800E MODULE Refer to CHAPTER 2 System Overview for installation instructions CAUTION Do not insert or remove any module while the FOM 7900B is powered up This could damage the module and or mainframe Be sure the module is properly installed before applying power to the FOM 7900B CAUTION The Fiber Optic Source Module is a static sensitive device Installing or removing any module from the FOM 7900B System should take place at an ESD protected workbench The operator should be properly earth grounded The 79800E Source Modules with version 6 1 or higher firmware should be used in the FOM 7900B Mainframes running version 3 4 or higher firmware Each module provides a stable laser source at a user specified maximum power and center wavelength Annual factory calibration is recommended for best performance of the FOS 79800E Source Modules CHAPTER 4 FOS 79800E Module 4 1 ILX Lightwave 70032603 Revision 00 FOS 79800E SPECIFICATIONS 4 2 A list of wavelength and power levels for source modules is shown in Table 4 1 Performance specifications for the series of FOS 79800E Precision Fiber Optic Source Modules are shown in Table 4 2 In keeping with our commitment to continuing improvement Corporation reserves the right to change specifications without notice or liability for such changes
35. PROGRAM DATA more than one exponential indica tor E 110 lt SUFFIX PROGRAM DATA must have digit following sign 111 SUFFIX PROGRAM DATA must have alpha character following operator 113 ARBITRARY BLOCK PROGRAM DATA length less than digit count 114 DEFINITE LENGTH BLOCK PROGRAM DATA premature end of data 115 PLACEHOLDER PROGRAM DATA identifier not valid 116 Parser syntax error character was not expected 120 program mnemonic gt Lookup word as part of a header path has no commands 121 program mnemonic gt Lookup word as part of a header path is not found 122 program mnemonic gt Lookup cannot find a null entry CHAPTER 12 Error Messages FOM 7900B FIBER OPTIC SYSTEM ERRORS ILX Lightwave 70032603 Revision 00 Table 12 2 Parser Errors EXPLANATION 123 lt program mnemonic gt Lookup word within context of current path is not found 124 lt program mnemonic gt Lookup failed because query command type match failed 125 lt program mnemonic gt Lookup word within context of common command path is not found 126 Too few or too many program data elements Table 12 3 Execution Control Errors R EXPLANATION 201 lt PROGRAM DATA gt value out of range 202 lt PROGRAM DATA gt will not convert to valid type 203 Security violation command is not available withou
36. Pending flag is true This allows the programmer to make the FOM 7900B wait for the completion of an operation before continuing TOPO SYNTAX CHAPTER 8 GPIB Remote Operation and Common Commands Common Commands and Queries 8 23 ILX Lightwave 70032603 Revision 00 ERROR MESSAGES Error messages may appear on the display These errors are also held for retrieval through GPIB The error queue can be read by issuing the ERR command This command returns a string containing up to ten error messages from the error message queue If ERR is sent when the error queue is empty an ASCII zero 0 is returned If the error queue is active bit 7 in the Status Byte is also set to one 1 Each installed module has its own error queue CHAPTER 12 contains an explanation of the error messages which may be reported remotely by the FOM 7900B STATUS REPORTING FIGURE 8 11 shows the status reporting scheme for the FOM 7900B Fiber Optic System Each of the internal status reporting registers which may be accessed by a command or query have the appropriate GPIB command or query written above or below the register definition For example the Condition Register may be queried with the COND query as shown by its register heading in FIGURE 8 11 The condition or event registers are logically ANDed with their respective enable registers e g ENAB COND These bits are then logically ORed to form a summary message in the status byt
37. The ON parameter name could be used in place of the 1 The commands OUT 1 OUT ON and OUT TRUE are equal Table 8 5 Substitute Parameter Names SUBSTITUTE NAME VALUE ON 1 OFF 0 TRUE 1 FALSE 0 CHAPTER 8 GPIB Remote Operation and Common Commands Getting Started with GPIB 8 11 ILX Lightwave 70032603 Revision 00 Queries A query has no space between the mnemonic and the question mark as in OUT Terminators The FOM 7900B uses a terminator of lt NL gt lt END gt new line EOI In almost all cases these terminators are automatically inserted by the system controller or GPIB driver For more information refer to the IEEE 488 2 standard definition lt PROGRAM MESSAGE TERMINATOR gt 8 12 CHAPTER 8 GPIB Remote Operation and Common Commands Getting Started with GPIB ILX Lightwave 70032603 Revision 00 COMMON COMMANDS AND QUERIES This section contains a list of the common commands and queries which are supported by the FOM 7900B These commands are distinguished by the asterisk which begin each mnemonic The common commands and queries are listed in alphabetical order and a brief description of their functions and syntax is given below For more information on these commands refer to the ANSI IEEE 488 2 1987 standards reference Table 8 6 GPIB Common Commands COMMAND DESCRIPTION CLS Clears existing errors ESE Set
38. Use this parameter to open or shut the Source Shutter Use the UP or DOWN arrow keys to select OPEN or SHUT Then press the ENTER key to implement the change The green LED on the front of the module indicates the presence of light The green LED will only illuminate if the Output is ON and the Shutter is OPEN This parameter is displayed only when the shutter option has been detected in the module Set Power Level SET LEVEL 1 23 DBM Use this parameter to set the output power in dBm The number displayed on the bottom line indicates the present power level Use the LEFT and RIGHT arrow keys to move the cursor and the UP and DOWN arrow keys to adjust the level Then press the ENTER key to implement the change CHAPTER 4 FOS 79800E Module FOS 79800E Source Module Parameter menu ILX Lightwave 70032603 Revision 00 Set Wavelength CH1 SET WAVELENGTH 1552 456 NM Use this parameter to set the wavelength in nanometers The number displayed on the bottom line indicates the present wavelength setting Use the LEFT and RIGHT arrow keys to move the cursor and the UP and DOWN arrow keys to adjust the wavelength Allow time for wavelength to stabilize after resetting User Calibration CH 1 CAL MODE PRESS ENTER Press the ENTER key to proceed to the secondary menu structure specific to the field calibration of the FOS 79800E Fiber Optic Source Module Calibrate Power Level CAL LEVEL 1 55 DBM The Cal Level fe
39. When the timer is enabled the module will automatically move the switch position to the next port in the sequence at the rate determined by the timer interval The Timer mode is convenient for conducting long term tests in situations where remote control of the switch by a host computer is not possible Note that the Timer and Trigger modes are mutually exclusive if the Timer mode is ENABLEd the Trigger mode will be DISABLEd 6 6 CHAPTER 6 FOS 79710 Module FOS 79710 Parameters ILX Lightwave 70032603 Revision 00 Set Interval Time CH 1 TIME INTERVAL 3 21 SEC This parameter sets the internal timer interval in seconds Use the LEFT and RIGHT arrow keys to move the cursor and the UP and DOWN arrow keys to adjust the interval time Then press the ENTER key to activate the change The timer interval is can be set from 1 00 to 60 00 seconds The resolution of the internal timer itself is 10 ms however it should be kept in mind that the absolute resolution of the switch is 16 ms Initialize Timer Switch Sequence CH1 SEQUENCE 1 gt 4 PRESS ENTER Press the ENTER key to initialize the four element timer switch sequence default 11 gt 253544 Customize Timer Switch Sequence STEP 1 PORT 3 Use this and the next three menu items to customize the switch sequence for the Timer mode Use the UP or DOWN arrow keys to select the next port in the sequence and press ENTER to activate the change Pressing ENTER here
40. and Common Commands Common Commands and Queries ILX Lightwave 70032603 Revision 00 PSC The POWER ON STATUS CLEAR QUERY allows the programmer to query the FOM 7900B s power on status clear flag RESPONSE 0 The Standard Event Status Register 5 Service Request Enable Register SRE Event Status Enable Register ENAB EVE Condition Status Enable Register ENAB COND Power Event Status Enable Register ENAB EVE Power Condition Status Enable Register retain their values when power is cycled to the FOM 7900B SYNTAX 1 The registers listed above are cleared set to zero when the FOM 7900B power is cycled PUD The PROTECTED USER DATA command stores data unique to the FOM 7900B such as calibration date and serial number The PUD data is entered by the factory and protected from change by the SECURE command The arbitrary block program data is 25 bytes long white arbitrary block 4 space data SYNTAX CHAPTER 8 GPIB Remote Operation and Common Commands Common Commands and Queries 8 19 ILX Lightwave 70032603 Revision 00 SYNTAX RESPONSE 8 20 PUD The PROTECTED USER DATA QUERY allows the user to retrieve the contents of the PUD storage area The response is the contents of the unique data which was last entered The factory set response to the PUD is 22 1nnnnnnnnvvgrMMDDYYABC where Unit Serial number v Firmware Revision numb
41. available BOTH FILT 50 Sets both optical power meters to average a reading over 50 individual measurement samples OPM1 FILT 1 Sets the first optical power meter to report each individual measurement sample without averaging X Front Panel FILTer X Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The BOTH FILTer and 1 queries return the current filter settings None The response is an nrf value A setting of 1 disables all filtering BOTH FILT 1 0 1 0 Indicates both optical power meters have no filtering OPM1 FILT 2 The user has requested to average a reading over 2 measurement samples CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 Front Panel FREQuency Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The FREQuency command is used to set the internal modulation frequency SYNTAX DIAGRAM PARAMETERS The lt nrf value is a floating point value representing the internal modulation frequency in KHz POINTS OF INTEREST The internal modulation signal is common to all modules This signal can be set between 1 kHz and 500 kHz EXAMPLES FREQ 100 00 sets the internal modulation frequency to 100 00 kHz Front Panel FREQuency Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The FREQuency query returns the modulation frequency in KHz POPC PARAMETERS None SYNTAX DIAGRAM CHAPTE
42. cycle 50 rear panel TTL level input Some rising edge ring above 100kHz See FOM 7900B System Mainframe specifications for more information Other connector types available Some specifications may be degraded Also available PANDA PM fiber aligned to slow axis Table 4 3 Module General Specifications GENERAL SPECIFICATION Operating Temperature 15 C to 35 C Storage Temperature 40 C to 70 C Humidity lt 90 relative humidity non condensing Module Dimensions H W D 12 8 x 3 5 x 29 0cm 5 x 1 4 x 11 4in Weight 0 5kg 1 116 55 810 SOURCE SHUTTER OPTION 4 4 The SS 810 source shutter is a thermally stabilized optical 1x1 switch which is used to block the light from the laser in the FOS 79800E Source Module When the shutter is shut light is blocked but the laser remains on The shutter can be controlled through both the front panel and the GPIB interface Table 4 4 SS 810 Source Shutter Specifications 55 810 SOURCE SHUTTER SPECIFICATIONS Power stability 24 hr 25 1 lt 0 07dB Power stability 15 min 25 1 lt 0 005 rms Wavelength stability 24 hr 3441 C x0 005nm Minimum switch cycle speed 240 msec Shutter ON OFF power repeatability 0 05dB CHAPTER 4 FOS 79800E Module SS 810 Source Shutter OPTION ILX Lightwave 70032603 Revision 00 FOS 79800E SOURCE MODULE PARAMETER MENU For FOM 7900B syste
43. does not change the actual switch position but merely places the new port position into the chosen element of the sequence array It is possible to select None to skip a switch position or to shorten the executed sequence by repeating a port position For instance to switch repeatedly between ports 2 and 4 choose the sequence 2 gt 452544 CHAPTER 6 FOS 79710 Module FOS 79710 Parameters 6 7 6 8 ILX Lightwave 70032603 Revision 00 Return to Main Menu CH 1 USER MODE PRESS ENTER Press the ENTER key to return to the main menu structure Error Display CH 1 ERROR 504 INVALID SWITCH This parameter is displayed only when an error condition has been detected within the module The parameter cannot be modified and the arrow keys and ENTER key are disabled Error messages are defined in CHAPTER 12 CHAPTER 6 FOS 79710 Module FOS 79710 Parameters ILX Lightwave 70032603 Revision 00 EXTERNAL TRIGGER SPECIFICATIONS When Trigger mode is enabled the FOS 79710 Fiber Optic Switch Module responds to an external trigger signal on the rear panel of the FOM 7900B Mainframe The same effect may be accomplished by sending the TRIG command using GPIB or RS 232 communication protocol The TRIG command is particularly useful for switching several FOS 79710 s simultaneously The electrical specifications of the external trigger interface are shown in Table 6 3 Table 6 3 External Trigger Specifications
44. in bank 0 1 10 Bank 1 mainframe only commands 1 11 18 Specific modules in bank 1 1 19 All channels in bank 1 2 20 Bank 2 mainframe only commands The scheme above is valid up through Bank 24 Channel 249 EXAMPLES CH 0 selects channel 0 of bank 0 mainframe only commands CHANNEL 22 selects channel 22 module 2 in bank 2 CHAN 79 selects channel 79 all modules in bank 7 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 13 ILX Lightwave 70032603 Revision 00 X Front Panel CHannel Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The CHannel query is used to determine which channel has been selected SYNTAX DIAGRAM COPE PARAMETERS None RESPONSE lt response data gt lt response terminator gt where the response data is an integer between 0 249 representing the channel number EXAMPLES CHannel 4 the module in channel four is selected 9 14 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 X Front Panel COHerence Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The COHerence command is used to turn on or off the coherence control feature in compatible modules SYNTAX DIAGRAM PARAMETERS lt nrf gt is a 1 0ON or 0 OFF POINTS OF INTEREST This command will turn the coherence control feature on or off Some modules may not
45. modulation frequency in kHz The value on the bottom line indicates the present modulation frequency Use the LEFT and RIGHT arrow keys to move the cursor and the UP and DOWN arrow keys to adjust the frequency Then press the ENTER key to implement the change Modulation Source CH ALL MOD SOURCE INTERNAL Use this parameter to set the modulation source as INTERNAL or EXTERNAL The value on the bottom line indicates the present source of the modulation signal Use the UP and DOWN arrow keys to select the source of the modulation signal Then press the ENTER key to implement the change When the modulation source is INTERNAL the signal generated by an internal function generator is sent down the FOM 7900B backplane and to the MODULATION OUT connectors on the rear panel When the modulation source is EXTERNAL the modulation signal provided at the MODULATION IN connector on the FOM 7900B rear panel is sent down the backplane and to the MODULATION OUT connectors The modulation is then enabled and disabled in the modules using the Modulation command Return to Main Menu CH ALL USER MODE PRESS ENTER Press the ENTER key at this display to return to the main menu structure CHAPTER 3 FOM 7900B Mainframe Operation Mainframe Parameter Menu 3 5 ILX Lightwave 70032603 Revision 00 Modulation ON OFF CH ALL MODULATION ON Use this parameter to enable or disable the modulation in the modules Use the UP or DOWN arrow
46. numeric notation IEEE488 2 Integer exponential or floating point may be used with the decimal radix Alternate radices may be selected in remote operation POINTS OF INTEREST Has special information about the command EXAMPLES Shows typical statements using the command Front Panel BOTH WAVElength or OPM1 WAVElength Remote FOM 7900B DPM 79810 FOS 79800E FOS 79710 he BOTH WAVElength and OPM1 WAVElength commands set the wavelengt of the optical power that is being measured SYNTAX DIAGRAM white space gt lt nrf value gt PARAMETERS AN lt NRF VALUE POINTS OF Changes in the detector response are significant enough INTEREST that the optical power meter must know the wavelength of the source signal in order to properly display the optical power The default unit of nanometers is assumed when entering this value The operating range for this optical power meter is 850 000nm to 1700 000nm EXAMPLES BOTH WAVE 1550 000 action Sets both optical power meters to calculate the optical power based on the responsivity of the detector at 1550 000nm OPM1 WAVE 1480 000 action Sets the first optical power meter to calculate the optical power based on the responsivity of the detector at 1480 000nm FIGURE 9 1 Command Format CHAPTER 9 Command Reference Commands and Queries 9 3 ILX Lightwave 70032603 Revision 00 Table 9 1 FOM 7900B Mainframe Specific Commands
47. perform as expected It is not a service manual rather a guide to alleviate basic problems which may arise during operation Some of the common causes and corrective actions for problems are listed in this chapter If additional symptoms persist contact your ILX Lightwave representative SYSTEM TROUBLESHOOTING GUIDE Table 13 1 System Troubleshooting SYMPTOM CAUSES AND CORRECTIVE ACTIONS FOM 7900B will not 1 Check the power cord to make sure that it power up is properly connected Check the fuse for integrity and the proper rating 2 Ifthe above suggestion fails verify the line voltage selection is compatible for your area Channel Output will not 1 Check to be certain the channel output has turn on or will not stay been turned on and that the output level on setpoint is correct 2 Make sure an appropriate fiber patch cord has been correctly installed to the output connector 3 A TEC open circuit Current Limit or Power Limit condition could be disabling the output CHAPTER 13 Troubleshooting 13 1 ILX Lightwave 70032603 Revision 00 GPIB TROUBLESHOOTING GUIDE 13 2 If you have difficulty operating the FOM 7900B through GPIB refer to the symptoms listed here Table 13 2 GPIB Troubleshooting SYMPTOM CAUSES AND CORRECTIVE ACTIONS No response from the 1 Check that a GPIB or RS232 cable is FOM 7900B upon a GPIB connected between the FOM 7900B and command re
48. trigger signal that is 9 available at the rear panel TRIGGER OUT connector The mice Electrical specifications are the same at the trigger input A trigger input signal is duplicated at the trigger output connector Sending the GET or TRIG GPIB commands also generates a signal at the TRIGGER OUT connector Modulation Input Connector External Modulation It is possible to modulate the sources within the FOM 7900B using an external signal This signal must be in the form of a TTL signal between 1kHz and 500kHz applied to the MODULATION IN connector on the rear panel When the TTL signal is high 5 volts the source s will be turned on When the TTL signal is low 0 volts the source s will be turned off The input signal is also available at the MODULATION OUT connectors on the rear panel To use this feature the FOM 7900B must be configured for external modulation by choosing EXTERNAL from the Mod Source menu Refer to CHAPTER 3 FOM 7900B Mainframe Operation for explanation of mainframe menu selections CHAPTER 2 System Overview Rear Panel 2 5 ILX Lightwave 70032603 Revision 00 Modulation Output Connectors The signal used to modulate the sources internal or external is available as differential outputs from the rear panel of the instrument The non inverted signal is high 5 volts when the sources are turned on and low 0 volts when the sources are turned off The inverted signal has the opposite polarity The Mo
49. wavelength of the source signal in order to properly display the optical power The wavelength is always reported in nanometers EXAMPLES BOTH WAVE 1550 000 1560 00 Indicates that the first optical power meter is using 1550 000nm and the second optical power meter is using 1560 00nm to calculate the optical power measurement OPM1 WAVE 1550 000 The first optical power meter is using 1550 000 to calculate the optical power measurement CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 69 ILX Lightwave 70032603 Revision 00 X Front Panel WAVEMAX X4 Remote FOM 7900B V FOS 79800E FOS 79710 DPM 79810 The WAVEMAX query returns the maximum wavelength setting in nanometers SYNTAX DIAGRAM RESPONSE response data response terminator where the response data represents the wavelength in nanometers POINTS OF INTEREST The wavelength is set with the WAVE command and cannot be greater than the WAVEMAX value EXAMPLES WAVEMAX 1551 256 the maximum wavelength is set to 1551 256 nm 9 70 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 WAVEMIN Remote FOM 7900B x4 FOS 79800E FOS 79710 DPM 79810 The WAVEMIN query returns the minimum wavelength setting in nanometers SYNTAX DIAGRAM RESPONSE response data response terminator where the response data represents the wavelengt
50. you keep your ILX Lightwave instrumentation at peak performance ILX Lightwave 70032603 Revision 00 PRODUCT SAFETY INFORMATION Definition of symbols Important operating and maintenance servicing instructions Risk of electrical shock Static sensitive device use proper grounding provisions Power ON symbol Standby Symbol c e Cautions and Warnings CAUTION NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL gt WARNING The operating line voltage of the 7900B is set at the factory The voltage setting is marked on the back panel Changing the line voltage requires disassembly of the mainframe In addition to voiding the warranty removing the back panel may expose the user to the risk of electrical shock gt WARNING Equipment may produce high leakage currents when the safety ground is faulty Ensure that the power supply cord is connected to a properly grounded mains receptacle gt WARNING TO PREVENT FIRE OR SHOCK HAZARD DO NOT EXPOSE THIS EQUIPMENT TO MOISTURE vi ILX Lightwave 70032603 Revision 00 LASER SAFETY FOR THE FOS 79800E There are laser and electrical safety issues that must be considered during the operation of the FOS 79800E laser source modules The FOS 79800E laser source modules must be used as intended in this manual Any other use not specified in this manual may result in a hazard T
51. 0 Front Panel TERM Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The TERM query returns a 1 if the GPIB response terminator is CR LF EO and returns a 0 if the response terminator is LF EOI PARAMETERS None SYNTAX DIAGRAM RESPONSE lt response data gt lt response terminator gt where the response data is a 1 ON or 0 OFF POINTS OF INTEREST Use TERM to verify the state of the GPIB termination characters EXAMPLES TERM 0 GPIB response terminator is LF EO which is the IEEE 488 2 standard 9 60 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference SYNTAX DIAGRAM PARAMETERS RESPONSE POINTS OF INTEREST EXAMPLES ILX Lightwave 70032603 Revision 00 Front Panel TIME Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The TIME query allows the programmer to determine how much time has passed since the FOM 7900B System was last powered up lt response data gt lt response terminator gt where the response is character data in the form hours minutes seconds The TIME clock is independent of the TIMER clock The clock turns over after approximately 1193 hours TIME 0 01 02 36 1 minute and 2 36 seconds have passed since the FOM 7900B was powered up CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 61 ILX Lightwave 70032603 Revision 00 Front Panel
52. 0 Setup Mode CH ALL SETUP MODE PRESS ENTER Press the ENTER key to proceed to GPIB remote setup Set GPIB Address CHALL GPIB ADDRESS 01 Use this parameter to adjust the GPIB Talk Listen address Use the LEFT and RIGHT arrow keys to move the cursor and the UP and DOWN arrow keys to adjust the GPIB address to a value from 1 through 31 Then press the ENTER key to implement the change Set Bank Address CHALL BANK ADDRESS 2 It is possible to link several FOM 7900B Systems together to control up to 200 channels from one GPIB Address Each FOM 7900B in the linked system must have a unique Bank Address Use this parameter to adjust the Bank Address Use the LEFT and RIGHT arrow keys to move the cursor and the UP and DOWN arrow keys to adjust the Bank Address to a value from 0 through 24 Then press the ENTER key to implement the change Return to Main Menu CH ALL USER MODE PRESS ENTER Press the ENTER key at this display to return to the main menu structure CHAPTER 3 FOM 7900B Mainframe Operation Mainframe Parameter Menu 3 7 3 8 ILX Lightwave 70032603 Revision 00 Error Display CH 1 ERROR 123 SYNTAX ERROR This parameter is displayed only when an error condition has been detected within the mainframe The parameter cannot be modified and the arrow keys and the ENTER key are disabled Error messages are defined in CHAPTER 12 Error Messages CHAPTER 3 FOM 7900B Mainframe
53. 032603 Revision 00 FOM 7900B MAINFRAME AND MODULE COMMAND REFERENCE SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES X Front Panel CALibration X Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The BOTH CALibration and OPM1 CALibration commands set the user calibration constant An nrf value 0 500 to 2 000 The most common application of user calibration is to calibrate the optical power meter to read correctly with an external attenuator For example if you attach a calibrated 3dB attenuator only 5096 of the input signal gets to the meter In this situation set the user calibration factor to 2 000 and the meter will then display correctly Remember to consider the accuracy of the attenuator as well as the meter in attenuated measurements BOTH CAL 2 0 Sets both optical power meters user calibration constant to 2 OPM1 CAL 0 5 Sets the first optical power meter user calibration constant to 0 5 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 9 ILX Lightwave 70032603 Revision 00 X Front Panel CALibration X Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The BOTH CALibration and OPM1 CALibration queries return the current user calibration constant SYNTAX DIAGRAM PARAMETERS None The response is an nrf value POINTS OF INTEREST A setting of 1 000 disables the affects of a user calibration constant EXAMPLES BOTH CAL 1 0 1 0 Means that a user
54. 10 Module Commands BOTH REFerence NAME PARAMETERS FUNCTION MODE 1 Sets the display mode to 1 absolute 2 relative OPM1 OPM2 3 relative OPM2 OPM1 MODE NONE Returns the current mode of operation 1 absolute 2 relative OPM1 OPM2 3 relative OPM2 OPM2 OPMn CALibration 1 Sets the user calibration constant BOTH CALibration valid values are 0 500 to 2 000 OPMn CALibration NONE Returns the user calibration constant BOTH CALibration 1 000 is the default OPMn FILTer 1 Sets the number of samples that are averaged to generate a measurement valid range is 1 to 50 OPMn FILTer NONE Returns the current number of BOTH FILTer samples that are being averaged to generate a measurement 1 is the default OPMn POWer NONE Returns the current power measurement for optical power meter OPMn RANGE 1 Sets the range value for the optical BOTH RANGE power measurement valid range is 0 8 Where 0 Auto Range 1 1W 2 100mW 3 10mW 4 1mW 5 100yuW 6 10 uW 7 1 8 100nW OPMn RANGE NONE Returns the current setting for the BOTH RANGE range value 0 is the default OPMn REFerence 1 Sets the current power measurement as a reference value The remaining measurements when a reference is recorded become the difference in power The valid parameter for this command is ON or OFF CHAPTER 9 Command Reference Device Specific Commands
55. 230 END IF 240 IF Ibsta AND Timo THEN PRINT 7900B GPIB TIMEOUT Did the bus timeout 250 EXIT SUB 260 Handler Did the software bomb 270 PRINT MISC SOFTWARE GENERATED ERRORS IN 7900B DRIVER SUP 280 END SUB Table 10 2 Display Calibration 10 SUB Cal Display Device id Level Wave 20 Enters the level and wavelength display cal points for a 79800E Fiber Optic Source Module 30 40 CALL 7900dvr Device id CH 1 Response Err Set the channel number 50 CALL 7900dvr Device id CAL LEVEL Level Response Err Cal the output display 70 CALL 7900dvr Device id LEVEL 1 00 Response Err Set output level to 1 00 dBm 60 CALL 7900dvr Device id CAL WAVE Wave Response Err Cal the wavelength disp 80 CALL 7900dvr Device_id LEVEL Response Err Verify level setpoint 90 Lev VAL Response 100 PRINT The current output level setpoint is Lev 110 END SUB 10 2 CHAPTER 10 Programming Examples ILX Lightwave 70032603 Revision 00 CHAPTER 11 MAINTENANCE This chapter describes how to maintain the FOM 7900B System Included are sections covering fuse replacement and line voltage information WARNING To avoid electrical shock hazard connect the FOM 7900B System to a properly earth grounded three prong receptacle only Failure to observe this precaution can result in severe injury or death
56. 900B FOS 79800E FOS 79710 DPM 79810 The SOURCE query returns the source of the modulation signal as either internal or external Opes lt response data gt lt response terminator gt where the response data is a 0 for internal and a 1 for external modulation Source Use SOURCE to verify the source of the modulation signal as internal or external SOURCE 0 The source of the modulation signal is internal 9 58 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 Front Panel TERM Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The TERM command is used to add a carriage return to GPIB response termination from the FOM 7900B SYNTAX DIAGRAM PARAMETERS The lt nrf gt is 1 true or 0 false POINTS OF INTEREST The IEEE 488 2 standard for GPIB requires all commands and responses to be terminated with LF EOI The FOM 7900B is IEEE 488 2 compliant however some older GPIB control cards still expect the termination sequence to be CR LF EO Sending the TERM TRUE command will add a carriage return to the termination sequence TERM FALSE will remove the carriage return from the termination EXAMPLES TERM TRUE The GPIB termination sequence is CR LF EOl TERM FALSE The GPIB termination sequence is LF EOI CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 59 ILX Lightwave 70032603 Revision 0
57. 900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 X Front Panel OUT X Remote FOM 7900B x4 FOS 79800E FOS 79710 DPM 79810 The OUT command is used to turn the source on or off SYNTAX DIAGRAM PARAMETERS The lt nrf value of ON or 1 to turn the laser on OFF or 0 to turn the source off POINTS OF INTEREST f this command is sent to channel or 9 then all sources within the mainframe are turned ON OFF If sent to a specific module 1 8 in the mainframe then only that channel is turned ON OFF The green LED on the front of the module indicates the state of the source When the output is turned on there is a three second safety startup During the startup period the front panel ON LED blinks rapidly EXAMPLES OUT 0 Turns the laser source off OUT ON Turns the laser source on CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 37 ILX Lightwave 70032603 Revision 00 X Front Panel OUTput X Remote Y FOM 7900B Y FOS 79800E FOS 79710 DPM 79810 The OUTput query returns the ON OFF status of the sources SYNTAX DIAGRAM PARAMETERS None RESPONSE data response terminator where the response data is a 1 ON or 0 OFF EXAMPLES OUT 0 The selected channel is turned off Y Front Panel PORT Remote FOM 7900B FOS 79800E Y FOS 79710 DPM 79810 The PORT command is used to switch any port to the common port SYNTAX DIAGRAM 9 38 CHAPTE
58. CHAN 13 LEVEL 5 WAVE 1550 0 CHAN 22 LEVEL WAVE CHAN 23 LEVEL WAVE There are three errors above 1 Mixing commands to multiple channels on the same command line 2 Sending a message that does not contain a query the first line 3 Not using the correct method of selecting a channel Correct command lines CHAN 12 OPC LEVEL 5 OPC CHAN 13 OPC LEVEL 5 WAVE 1550 0 OPC CHAN 22 OPC LEVEL WAVE CHAN 23 OPC LEVEL WAVE If a non existent bank is addressed and sent a query the response Bank not found n will be returned in approximately 10 seconds where n is the bank number channel number divided by 10 This time out period can be changed with the TIMEOUT command described in CHAPTER 9 CHAPTER 7 RS 232 Interface Communication with multiple FOM 7900B systems 7 5 ILX Lightwave 70032603 Revision 00 page left blank intentionally 7 6 CHAPTER 7 RS 232 Interface Communication with multiple FOM 7900B systems ILX Lightwave 70032603 Revision 00 CHAPTER 8 GPIB REMOTE OPERATION AND COMMON COMMANDS A GPIB IEEE 488 2 interface is installed in the FOM 7900B System to allow fast and efficient remote operation This interface complies with the IEEE 488 2 1987 standard to the extent shown below Table 8 1 GPIB Capability IEEE 488 INTERFACE SPECIFICATIONS SH1 Source Handshake complete compatibility AH1 Acceptor Handshake complete capability T6 Talker Functions
59. COND 9 19 ENABle EVEnt 9 20 ENABle EVEnt 9 21 ERRor 9 22 EVEnt 9 24 FREQuency 9 27 FREQuency 9 27 MESsage 9 32 MESsage 9 33 MODulation 9 35 MODulation 9 36 OUTput 9 38 RADix 9 41 RADix 9 42 SECURE 9 48 SOURCE 9 57 SOURCE 9 58 TERM 9 59 TERM 9 60 TIME 9 61 TIMEOUT 9 62 L TIMEOUT 9 63 TIMER 9 64 TRIGger 9 65 FOS 79710 Module ERRor 9 22 IDN 9 28 INTERVAL 9 29 INTERVAL 9 30 PORT 9 38 PORT 9 39 SEQ DEFAULT 9 49 SEQ SWn 9 49 SEQ SWn 9 50 SEQ TMR 9 51 SEQ TMR 9 51 SEQ TRG 9 52 SEQ TRG 9 53 FOS 79800E Module CAL LEVEL 9 10 CAL RESET 9 11 CAL WAVE 9 12 ERRor 9 22 IDN 9 28 LEVEL 9 31 LEVEL 9 31 OUT 9 37 OUTput 9 38 SERNUM 9 54 SHUTTER 9 54 SHUTTER 9 55 9 56 WAVE 9 67 WAVE 9 67 WAVEMAX 9 70 WAVEMIN 9 71 Line Voltage Selection 11 2 Module Installation 2 7 Module replacement 11 3 P Power Up 2 8 ILX Lightwave 70032603 Revision 00 R Rear Panel 2 4 Connector GPIB 2 5 Modulation Input 2 5 Modulation Output 2 6 RS 232 2 5 Trigger Input Output 2 5 Fuse 2 4 Power Entry Module 2 4 S Specifications Computer Interface GPIB IEEE 488 2 2 3 RS 232 2 3 External Trigger Input Output 2 3 FOM 7900B 2 1 Internal Modulation 2 2 Modulation In 2 2 Modulation Out 2 2 T Troubleshooting GPIB 13 2 System 13 1 Warm up 2 8 Index 3 ILX Lightwave 70032603 Revision 00 page left blank intentionally Index 4 ILX Lightwave 70032603 Revis
60. Definitions ILX Lightwave 70032603 Revision 00 lt PROGRAM MESSAGE TERMINATOR gt When a command is sent using the standard format the host computer or GPIB driver usually puts a NL END line feed EOI on the data bus following the command string The IEEE 488 2 standard requires NL END however many GPIB drivers utilize lt CR gt lt NL gt lt 4END gt or NL FOM 7900B accepts lt LF gt lt END gt lt CR gt lt NL gt lt END gt NL or END as an acceptable PROGRAM MESSAGE TERMINATOR The FOM 7900B always terminates its query responses with CR NL END unless changed by the TERM command FIGURE 8 3 PROGRAM MESSAGE TERMINATOR PROGRAM MESSAGE UNIT SEPARATOR gt A PROGRAM MESSAGE UNIT SEPARATOR is used to separate sequential PROGRAM MESSAGE UNIT elements commands from one another within a PROGRAM MESSAGE The syntax for a PROGRAM MESSAGE UNIT SEPARATOR is shown in FIGURE 8 4 message unit message unit FIGURE 8 4 PROGRAM MESSAGE UNIT SEPARATOR gt CHAPTER 8 GPIB Remote Operation and Common Commands ANSI IEEE 488 2 Definitions 8 5 ILX Lightwave 70032603 Revision 00 8 6 lt PROGRAM HEADER SEPARATOR gt The PROGRAM HEADER SEPARATOR separates the COMMAND PROGRAM HEADER GPIB command from the PROGRAM DATA first parameter after the command A single white space must be used to separate the command from the first parameter
61. E Used to add a CR to GPIB terminations TIME NONE Returns elapsed time since power up TIMEOUT 1 Sets the response time out for banked remote systems TIMEOUT NONE Returns the response time out for banked remote systems TIMER NONE Returns elapsed time since last TIMER TRIGger NONE Used to trigger compatible modules 9 4 CHAPTER 9 Command Reference Commands and Queries ILX Lightwave 70032603 Revision 00 DEVICE SPECIFIC COMMANDS The CHAN command must be sent before a device specific command shown in Table 9 2 and Table 9 3 so that the proper module will be addressed An example of the use of the CHAN command is shown below CHAN 3 Future commands except common commands are directed to the module in channel 3 CHAN Returns the active channel number CHANNEL 6 Future commands are directed to channel 6 Table 9 2 FOS 79800E Module Commands COMMAND PARAMETERS DESCRIPTION CAL LEVEL HHHH Sets the Power User Calibration CAL RESET HHHH Resets the User Calibration CAL WAVE THHHE HHH Sets the Wavelength User Calibration ERRor NONE Returns an error code See CHAPTER 12 IDN NONE Returns a string that identifies the module LEVEL XH I Sets the output power level LEVEL NONE Returns the output power level OUT Turns the output on and off OUT NONE Returns the ON OFF status of the laser SHUTPRES NONE Returns the presence of the shutter option SHUTTE
62. Everything you can do from the front panel can also be done remotely The following sections show you the fundamentals of operating your DPM 79810 Dual Power Meter module remotely through the GPIB or RS 232 interfaces Remote Configuration Refer to CHAPTER 7 RS 232 Interface and CHAPTER 8 GPIB Remote Operation and Common Commands for information concerning setup of RS 232 or GPIB remote communications Terminology Terminology required to successfully communicate with the DPM 79810 using GPIB is described in CHAPTER 8 GPIB Remote Operation and Common Commands The terms frequently used in this chapter are repeated below white space refers to ASCII characters such as Space Bar which are used as separators in the command syntax lt nrf value gt refers to the IEEE 488 2 standard for numeric format notation It is a generic label that means either integer floating point or scientific notation number representation CHAPTER 5 DPM 79810 MODULE Warnings 5 15 ILX Lightwave 70032603 Revision 00 COMMAND REFERENCE 5 16 Table 5 4 lists the commands for the DPM 79810 module It uses the nomenclature OPMn in places to indicate that a command can be sent either to the OPM1 optical power meter to the OPM2 optical power meter To send a command to the first optical power meter replace OPMn with OPM1 2 will cause a command to go to the second optical power meter Refer to CHAPTER 9 Command Reference fo
63. FOM 7900B DEFAULT CONFIGURATION GPIB LOCAL indicator is off unless RST is sent through GPIB Channel Modulation Ch 1 OFF Modulation Frequency 1 kHz Source Output OFF Coherence Control OFF CHAPTER 8 GPIB Remote Operation and Common Commands ANSI IEEE 488 2 Definitions 8 9 ILX Lightwave 70032603 Revision 00 GETTING STARTED WITH GPIB This section is intended as a quick guide to the GPIB syntax and commands used by the FOM 7900B The FOM 7900B module device dependent commands are described in CHAPTER 9 Command Reference Overview of the FOM 7900B Syntax 8 10 Generally a command or query is entered as shown in Table 8 1 The command query must contain all of the letters which are shown in upper case in FIGURE 8 2 and Table 8 1 However the command parser is not case sensitive so either upper or lower case may be used in any combination The lower case letters shown with the commands are optional and may be used for software clarity The commands FREQ and FREQuency are equal The syntax of the FOM 7900B commands follow the rules laid out in the IEEE 488 2 standard Colons indicate the start of a new command path Semicolons indicate a separation of commands within a string A leading semicolon may be used to return the FOM 7900B command parser to the command path root Spaces may be placed anywhere in a command string after the command header or query question mark
64. IDN 79800E means the module at the channel defined by the CHAN command is a 79800E Precision Fiber Optic Source Module X Front Panel INTERVAL X4 Remote FOM 7900B FOS 79800E Y FOS 79710 DPM 79810 The INTERVAL command sets the time interval used in the timer mode When the time interval has elapsed the module automatically moves the Switch to the next port in the sequence array The nrf value is the interval time value in seconds When the timer is enabled the module will automatically move the switch position to the next port in the sequence at the rate determined by the timer interval The switch sequence is described by the SEQ SWn commands The time interval range is 1 00 to 60 00 seconds The resolution of the timer itself is 10 ms however the absolute resolution of the switch is 16 ms INTERVAL 10 50 The interval timer is set to 10 50 seconds CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 29 ILX Lightwave 70032603 Revision 00 X Front Panel INTERVAL X Remote FOM 7900B FOS 79800E x FOS 79710 DPM 79810 The INTERVAL query returns the value of the internal timer in seconds porque PARAMETERS None SYNTAX DIAGRAM RESPONSE response data response terminator where the response data represents the interval time value in seconds POINTS OF INTEREST When the timer is enabled the module will automatically move the switch 9 30 positio
65. LE 5 1 ILX Lightwave 70032603 Revision 00 Understanding the Calibration Certificate The DPM 79810 is supplied with a certificate for calibration from ILX Lightwave s laboratory The following discussion explains the meaning of the information on your calibration certificate Photodetector Responsivity The DPM 79810 Dual Power Meter module is a stable low noise current meter with a photodetector inside a special optical cavity The cavity randomizes light input so changes in input polarization and pattern orientation have little net effect on the detector Factory calibration is a process of recording detector current while varying wavelength and holding light power constant The result is a table of detector responses every 10 nanometers in mA per mW When you connect input light the DPM 79810 measures detector current then uses your wavelength setting to look up the conversion factor on the calibration table Interpolation algorithms are used for wavelengths between these calibration points A sample of detector response plotted as a function of wavelength based on data from DPM 79810 meter calibrations performed at ILX Lightwave is shown in FIGURE 5 1 Detector Responses 79810 1A 79810 1B 79810 2 79810 2B 79810 3A 79810 3B lt gt 2 c o 2 850 950 1050 1150 1250 1350 1450 1550 1650 Wavelength nm
66. MAIN level menu structure Press the ENTER key to modify the displayed optical power meter s setup parameters NOTE Both the first optical power meter OPM1 and the second optical power meter OPM2 will be set to the same operating parameters when using the SETUP BOTH menu Recall Stored Setup Parameters CH1 1 RECALL 1 Use this parameter to recall previously configured setup parameters from a bin location Select Recall using the PARAM key from the SETUP menu Use the UP or DOWN arrow key or the numeric keypad to enter the recall bin number Press the ENTER key to recall the stored settings NOTE EMPTY BIN will be displayed if the user attempts to recall a bin number that does not contain previously stored setup parameters CHAPTER 5 DPM 79810 MODULE Operating Parameters Setup 5 11 ILX Lightwave 70032603 Revision 00 Source Wavelength CH 1 OPM1 WAVLNGTH 1550 00 NM NOTE Source wavelength must be entered in order for the DPM 79810 to display the correct optical power Select WavIngth using the PARAM key from the SETUP menu Use the or DOWN arrow key or the numeric keypad to enter the source wavelength Press the ENTER key The range of available wavelength settings is 850nm to 1650nm with a default value of 1550 00nm If the source wavelength is out of range the power reading will not be accurate Filtering Value Averaging Ra
67. NTEREST EXAMPLES ILX Lightwave 70032603 Revision 00 None The response is an lt nrf value gt 1 Absolute 2 Relative OPM1 OPM2 3 Relative OPM2 OPM1 This is a convenient method to verify that the mode has changed after issuing the mode command MODE 2 Indicates that module is displaying the difference in measured optical power of the first meter and the second meter OPM1 OPM2 X Front Panel MODulation X Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The MODulation command is used to turn the internal modulation on or off The lt nrf gt is a 1 ON or 0 OFF This command is used to enable or disable the internal modulation in the selected mainframe MOD 1 turns the internal modulation on MODULATION ON turns the internal modulation on CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 35 ILX Lightwave 70032603 Revision 00 X Front Pane MODulation X Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The MODulation query returns the ON OFF status of the internal modulation PARAMETERS None SYNTAX DIAGRAM RESPONSE lt response data gt lt response terminator gt where the response data is a 1 ON or 0 OFF POINTS OF INTEREST Use MODulation to verify the ON OFF status of the internal modulation EXAMPLES MOD 0 the FOM 7900B internal modulation is turned off 9 36 CHAPTER 9 Command Reference FOM 7
68. OINTS OF INTEREST The available range settings are AUTO 1W 100mW 10mW 1mW 100uW 10uW 1uW and 100nW mapped respectively to the values 0 to 8 When AUTO is selected the optical power meter automatically changes to the appropriate range setting based on the measured power The user can force the meter to a fixed maximum range by entering one of the eight available power ranges EXAMPLES BOTH RANGE 0 Sets both optical power meters to automatically set their range based on the measured optical input power OPM1 RANGE 1 Sets the first optical power meter to the 1 Watt range for measuring optical power in the range of 1Watt to 100milliwatts CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 43 ILX Lightwave 70032603 Revision 00 SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES X Front Panel RANGE X Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The BOTH RANGE and OPM1 RANGE queries return the current optical power measurement range setting None The response is an nrf value 0 to 8 The available range settings are AUTO 1W 100mW 10mW 1mW 100uW 10uW 1uW 100nW mapped respectively to the values 0 to 8 When AUTO is selected the optical power meter automatically changes to the appropriate range setting based on the measured power The user can force the meter to a fixed range maximum range by entering one of the eight available power ranges BOTH RANGE 0 0 Indi
69. PIB USING RS 232 Bank 0 Channels 0 9 Bank 1 Channels 10 19 GPIB E21 A Bank 2 CIB Channels 20 29 GPIB 0 A Bank 3 CIA To RS 232 A To RS 232 A of next 7900B of next 7900B COMMUNICATION WITH MULTIPLE FOM 7900B SYSTEMS The following issues are important when communicating with a stacked FOM 7900B System All of the GPIB common commands listed in CHAPTER 8 and device specific commands listed in CHAPTER 9 respond normally with multiple FOM 7900B systems All GPIB commands and queries including 488 2 common commands and queries are sent to the FOM 7900B mainframe or module selected by the CHAN command This includes the reset command RST Use the following formula to determine the channel number of a module in a multiple FOM 7900B system CHAN Bank Address x 10 Slot number NOTE unique Bank Address must be assigned to each FOM 7900B in the chain The unit connected to the GPIB interface must be assigned a bank address of 0 FIGURE 7 1 shows the addressing scheme for all FOM 7900B modules CHAPTER 7 RS 232 Interface Communication with multiple FOM 7900B systems 7 3 ILX Lightwave 70032603 Revision 00 7 4 EXAMPLE EXAMPLE EXAMPLE The fourth channel in the second mainframe would be CHAN 14 The sixth channel in the eleventh mainframe would be CHAN 106 All CHAN x0 commands e g CHAN 0 10 20 240 are directed to the appropriate mainframe This i
70. Power Level i rr ter etc 4 7 Calibrate Wavelength sse 4 8 Reset User 2 0 ee 4 8 Return to Main 44 4 8 Error DISplay inte eR ae 4 9 External Trigger ete e eet b tae 4 9 Error IndIGator 3 2 er E Safi carded 4 9 On Indicator e oot coe co cet M 4 9 Modulation nee ae recte ah en dee s 4 9 Coherence Control 2 040 4 10 5 DPM 79810 MODULE Warm up and Environmental Considerations 5 1 Measuring Higher Power 5 1 Understanding the Calibration Certificate 5 2 Photodetector Responsivity 5 2 DPM 79810 Specifications 00 5 4 DPM 79810 DUAL POWER METER MODULE 5 5 Connecting to the Power Meter Input Port 5 6 Measurements Using a Connector 5 6 Protecting the 5 6 DPM 79810 Dual Power Meter Module Parameter Menu 5 7 Module Identification 5 9 Request Zero Operation
71. R 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 PARAMETERS The lt nrf value is the port number to be switched to the common port POINTS OF INTEREST The nrf value can range from 0 to 4 Zero is the optically off position EXAMPLES PORT 3 Port 3 is switched to the common port X Front Panel PORT Remote FOM 7900B FOS 79800E Y FOS 79710 DPM 79810 The PORT query returns the current port number that is switched to the common port ons PARAMETERS None SYNTAX DIAGRAM RESPONSE lt response data gt lt response terminator gt where the lt response data gt represents the port number POINTS OF INTEREST The response is the port number that is switched to the common port Port zero is the optically off position EXAMPLES PORT 0 The common port is switched to the optically terminated position CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 39 ILX Lightwave 70032603 Revision 00 SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES 9 40 X Front Panel POWer X Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The OPM1 POWer query returns the current optical power measurement reading Open omo None The response is an nrf value In dBm mode the response will be indicated with a suffix of DBM The response time for new readings is dependant on the filter setting OPM1 POW
72. R 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 27 ILX Lightwave 70032603 Revision 00 RESPONSE lt response data gt lt response terminator gt where the response data is a floating point value equal to the internal modulation frequency setpoint in kHz POINTS OF INTEREST The internal modulation signal is common to all modules This signal can be set between 1 kHz and 500 kHz EXAMPLES FREQ 3 50 means the modulation frequency is 3 50 kHz FREQUENCY 100 00 means the modulation frequency is 100 kHz X Front Panel IDN X4 Remote FOM 7900B Y FOS 79800E Y FOS 79710 DPM 79810 The IDN query returns a string identifying the module i e 79800E With the DPM 79810 Dual Power Meter Module the module serial number is also returned For example the string 79810PP04 identifies the DPM 79810 Dual Power Meter Module with the module serial number 4 POPC PARAMETERS None SYNTAX DIAGRAM RESPONSE lt response data gt lt response terminator gt 9 28 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference POINTS OF INTEREST EXAMPLES SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES ILX Lightwave 70032603 Revision 00 Use this command to verify the identification and location of each module This command has the same effect as repeatedly pressing the PARAM key until the module title parameter is displayed
73. R ON OFF or 1 0 Opens ON and closes OFF the shutter SHUTTER NONE Returns the state of the shutter WAVE HERH HHH Sets the wavelength WAVE NONE Returns the wavelength setting WAVEMAX NONE Returns the maximum wavelength setting WAVEMIN NONE Returns the minimum wavelength setting CHAPTER 9 Command Reference Device Specific Commands 9 5 ILX Lightwave 70032603 Revision 00 Table 9 3 FOS 79710 1 x 4 Switch Module Commands COMMAND PARAMETERS DESCRIPTION ERR NONE Returns an error code See CHAPTER 12 IDN NONE Returns a string that identifies the module INTERVAL Sets the timer interval in seconds INTERVAL NONE Returns the timer interval in seconds PORT Sets the port that is switched to the common port PORT NONE Returns the currently selected switch port SEQ DEFAULT NONE Initializes the Trigger Timer switch sequence SEQ SWn Sets the nth position in the switch sequence array SEQ SWn NONE Returns the nth position from the sequence array SEQ TMR ON OFF Enables or Disables the Interval Timer 1 or 0 SEQ TMR NONE Returns the state of the Timer Mode 1 or 0 SEQ TRG ON OFF Enables or Disables the External Trigger 1 or 0 SEQ TRG NONE Returns the state of the Trigger Mode 1 or 0 9 6 CHAPTER 9 Command Reference Device Specific Commands ILX Lightwave 70032603 Revision 00 Table 9 4 DPM 798
74. RESPONSE VALUE RESPONSE 1 Not Used 256 Modulation ON OFF 2 Not Used 512 Sources ON OFF 4 Not Used 1024 Not Used 8 Not Used 2048 Not Used 16 Not Used 4096 Not Used 32 Not Used 8192 Not Used 64 Not Used 16384 Not Used 128 Not Used 32768 Not Used POINTS OF INTEREST The events which are summarized in bit 0 of the Status Byte can be set EXAMPLES SYNTAX DIAGRAM by using the ENABle EVEnt command The event status register is cleared when this query is sent or when the CLS command is issued Refer to the Status reporting diagram in FIGURE 8 11 EVE 256 internal modulation has been turned ON OFF X Front Panel FILTer 4 Remote FOM 7900B FOS 79800E FOS 79710 Y DPM 79810 The BOTH FILTer and OPM1 FILTer commands set the number of samples to average a measurement over PARAMETERS An lt nrf value 1 to 50 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 25 ILX Lightwave 70032603 Revision 00 POINTS OF INTEREST EXAMPLES SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES 9 26 Increasing the filtering allows the module to average numerous samples before providing a measurement This has the advantage of integrating out the affects of noisy signals A value of 1 will provide a measurement every 150msec each increase in filter count will add an additional 150msec Therefore when the filter setting is 50 it will take 7 5 seconds before a new reading is
75. ROR 501 when the laseris 1 The laser is being turned on before the first turned on laser case temperature has stabilized The error should reset when the system has warmed up adequately The output power may not be stable during this warm up period Unstable power level from the 1 It may be necessary to clean the fiber module optic bulkhead connectors on the front panel of the module 2 Make sure the FOM 7900B system has warmed up adequately 3 It may be necessary to turn on the Coherence Control ERROR 503 1 The laser source is being overdriven Reduce the output level and try again ERROR 508 1 The calibration data stored in the 79800E non volatile memory EEPROM has become invalid 2 The module must be recalibrated or reprogrammed with the original calibration data ERROR 509 1 The values of the user adjustable setpoints such as level and wavelength currently stored in non volatile memory EEPROM have become invalid These values will be set to the factory defaults based on the module calibration and the error condition will be cleared 2 Ifthis happens frequently the external AC power supplied to the FOM 7900B may not be within specification CHAPTER 13 Troubleshooting GPIB Troubleshooting Guide 13 5 ILX Lightwave 70032603 Revision 00 13 6 Table 13 4 FOS 79800E Source Module Errors SYMPTOM CAUSES AND CORRECTIVE ACTIONS Output power is substanti
76. RT POUR ASSURER LA PROTECTION FUTURE LE FUSIBLE DE REMPLACEMENT DOIT ETRE AUX MEMES SPECIFICATIONS PER UNA CORRETA PROTEZIONE SOSTITUIRE IL FUSIBILE SOLO CON UNO DI IDENTICO TIPO E POTENZA LINE VOLTAGE SELECTION The AC line voltage is preset at the factory and cannot be changed in the field Permitted fluctuations from rated line voltages are 6 and 10 Contact ILX Lightwave should it be necessary to change the AC line voltage 11 2 CHAPTER 11 Maintenance Fuse Replacement ILX Lightwave 70032603 Revision 00 MODULE REPLACEMENT Use the following instructions when replacing modules into the FOM 7900B Mainframe 1 Make sure the power to the FOM 7900B Mainframe is turned off CAUTION Do not insert or remove any module while the FOM 7900B is powered up This could damage the module and or mainframe Be sure the module is properly installed before applying power to the FOM 7900B CAUTION The Fiber Optic Source Module is a static sensitive device Installing or removing any module from the FOM 7900B System should take place at an ESD protected workbench The operator should be properly earth grounded 2 Select any available mainframe channel and if necessary remove the blank plate that covers that channel The plate is removed by loosening the screw at the bottom left corner 3 Position the module upright and guide it into the bay using the mount
77. Remote Operation and Common Commands Remote Interface Messages 8 27 ILX Lightwave 70032603 Revision 00 page left blank intentionally 8 28 CHAPTER 8 GPIB Remote Operation and Common Commands Remote Interface Messages CHAPTER 9 TERMINOLOGY ILX Lightwave 70032603 Revision 00 COMMAND REFERENCE This chapter is a guide to the syntax and usage of the various device dependent commands for the FOM 7900B System It contains a reference for all of the FOM 7900B mainframe and module commands in alphabetical order The device dependent commands are denoted by the Y next to the device label in the command description The commands which emulate local front panel operation are denoted by the Y next to the Front Panel label in the upper left corner of the command description The DPM 79810 module is a dual power meter Commands to control a parameter in one of the power meters are the same as commands for the other power meter they are differentiated by the use of the OPM1 or OPM2 header OPMn will sometimes be used to mean OPM1 or 2 Also included is the BOTH header this allows the user to set a parameter in both optical power meters to the same value with a single command FIGURE 9 1 shows the format for the command descriptions in this chapter The error messages which may be displayed on the FOM 7900B front panel are listed in CHAPTER 13 Terminology required to successfully communicate with the FOM 7900B Mainf
78. SE 8 15 ESR 8 16 IDN 8 16 OPC 8 17 OPC 8 17 PSC 8 18 PSC 8 19 PUD 8 19 PUD 8 20 RST 8 20 SRE 8 21 SRE 8 21 STB 8 22 TRG 8 23 WAI 8 23 ILX Lightwave 70032603 Revision 00 GPIB Commands DPM 79810 Module BOTH CALibration 9 9 BOTH CALibration 9 10 BOTH FILTer 9 25 BOTH FILTer 9 26 BOTH RANGE 9 43 BOTH RANGE 9 44 BOTH REFerence 9 45 BOTH REFerence 9 46 BOTH UNITS DBM 9 65 BOTH UNITS DBM 9 66 BOTH WAVEIength 9 68 BOTH WAVElength 9 69 BOTH ZERO 9 72 BOTH ZERO 9 73 IDN 9 28 MODE 9 34 MODE 9 34 OPM1 CALibration 9 9 OPM1 CALibration 9 10 OPM1 FILTer 9 25 OPM1 FILTer 9 26 OPM1 POWer 9 40 OPM1 RANGE 9 43 OPM1 RANGE 9 44 OPM1 RECALL 9 45 OPM1 REFerence 9 45 OPM1 REFerence 9 46 OPM1 RELative 9 47 OPM1 SAVE 9 48 OPM1 UNITS DBM 9 65 OPM1 UNITS DBM 9 66 OPM1 WAVElength 9 68 OPM1 WAVElength 9 69 OPM1 ZERO 9 72 OPM1 ZERO 9 73 OPM 2 CALibration 9 9 Index 1 ILX Lightwave 70032603 Revision 00 Index 2 OPM2 CALibration 9 10 2 9 25 2 9 26 OPM2 POWer 9 40 OPM2 RANGE 9 43 OPM2 RANGE 9 44 OPM2 RECALL 9 45 OPM2 REFerence 9 45 OPM2 REFerence 9 46 OPM2 RELative 9 47 OPM2 SAVE 9 48 OPM2 UNITS DBM 9 65 OPM2 UNITS DBM 9 66 OPM2 WAVElength 9 68 OPM2 WAVElength 9 69 OPM2 ZERO 9 72 OPM2 ZERO 9 73 FOM 7900B Mainframe CHannel 9 12 CHannel 9 14 COHerence 9 15 COHerence 9 15 CONDition 9 16 ENABle 9 17 ENABle COND 9 18 ENABle
79. TER key to initialize the four element trigger switch sequence to the following default sequence 15253544 Customize Trigger Switch Sequence STEP 1 PORT 4 Use this and the next three menu items to customize the switch sequence for the external trigger mode Use the UP or DOWN arrow keys to select the next port in the sequence and press ENTER to activate the change Pressing ENTER does not change the current switch position but merely places the new port position into the chosen element of the sequence array It is possible to select None to skip a switch position or to shorten the executed sequence by repeating a port position For instance to switch repeatedly between ports 1 and 3 choose the sequence 1 gt 35 153 4 CHAPTER 6 FOS 79710 Module FOS 79710 Parameters 6 5 ILX Lightwave 70032603 Revision 00 Return to Main Menu CH 1 USER MODE PRESS ENTER Press the ENTER key to return to the main menu structure Select Timed Mode CH 1 TIMED MODE PRESS ENTER Press the ENTER key to proceed to the menu for controlling the Timed Mode interval switching feature Enable Interval Timer CH 1 TIMER ENABLE ENABLE Use this parameter to enable or disable the automatic switching of the built in timer Use the UP or DOWN arrow keys to ENABLE or DISABLE the timer then press ENTER to activate the change For laser safety reasons the FOS 79710 Switch Module always powers up with Timer mode disabled
80. TIMEOUT Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The TIMEOUT command selects a time out value in milliseconds to use in detecting other 7900 systems in a banked RS232 configuration If a particular channel does not respond to a query within this time the query response Bank not found lt banknumber gt will be returned The default value for the time out is 10000 milliseconds 10 seconds SYNTAX DIAGRAM PARAMETERS lt nrf value is an integer between 0 2 147 483 647 EXAMPLES TIMEOUT 20000 remote unit response time out is set to 20 seconds TIMEOUT 500 remote unit response time out is set to 1 2 second TIMEOUT 10000 remote unit response time out is set to the default of 10 seconds 9 62 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 Front Panel TIMEOUT Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The TIMEOUT query is used to determine which the query response time out for banked remote units ores PARAMETERS None SYNTAX DIAGRAM RESPONSE lt response data gt lt response terminator gt where the response data is an integer between 0 and 2 147 483 647 representing the response time out in milliseconds EXAMPLES TIMEOUT 15000 Query response time out is 15 seconds CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 63 ILX Lightwave 70032603 Revisio
81. Table 4 1 DFB Source Modules ILX Lightwave MAXIMUM Service Channels MODULE CENTER WAVELENGTH POWER LEVEL STABILITY FOS 79800E 315C1 1527 98 1564 26nm C band 9 10mW note FOS 79800E 315L1 1564 27 1610 L band 9 10 mW note FOS 79800E 315C2 1527 98 1564 26 C band gt 10 upto 20mW note FOS 79800E 315L2 1564 27 1610nm L band gt 10 up to 20mW note FOS 79800E 315S 1475 1527 97 nm S band 9 20 mW note FOS 79800E 315EL 1610 01 1625nm 9 20 mW note Extended L band FOS 79800E SERV 1310 1480 1510 1625 5 9 20mW note FOS 79800E CUST Customer supplied lasers non standard product FOS 79800E 000 Special product for non standard wavelength 1 After 1 hour warm up typical Some modules may require longer warm up time For short term stability assume ambient temperature constant within 0 1 C For long term stability assume ambient temperature constant within 1 C 2 After warm up of up to 6 hours For short term stability assume ambient temperature constant within 0 1 C For long term stability assume ambient temperature constant within 1 C CHAPTER 4 FOS 79800E Module FOS 79800E Specifications Table 4 2 79800E Performance Specifications ILX Lightwave 70032603 Revision 00 OUTPUT POWER SPECIFICATION Level at full power Refer to Table 4 1 Stability 15 minutes spec 0 005dB r
82. The mainframe and each module contain their own error queue Direct the ERR query to a specific module or mainframe by issuing the CH x command first The error codes are numerically divided into areas of operation Refer to Table 12 1 Table 12 1 Error Code Classification ERROR CODE RANGE AREA OF OPERATION 001 to 099 Internal Program Errors 100 to 199 Parser Errors 200 to 299 Execution Control Errors 300 to 399 GPIB Errors 400 to 499 Mainframe Specific Errors 500 to 599 Module Specific Errors Table 12 2 Table 12 3 Table 12 4 Table 12 5 and Table 12 6 contain all of the error messages that may be generated by the device Not all of these messages may appear on the front panel display Some refer to GPIB communication only CHAPTER 12 Error Messages 12 1 ILX Lightwave 70032603 Revision 00 FOM 7900B FIBER OPTIC SYSTEM ERRORS 12 2 Table 12 2 Parser Errors ERROR CODE EXPLANATION 101 program mnemonic gt is too long 102 PROGRAM MESSAGE UNIT is too long 103 lt DEFINITE LENGTH ARBITRARY BLOCK PROGRAM DATA length too long 104 lt NON DECIMAL NUMERIC PROGRAM DATA type not defined 105 DECIMAL PROGRAM DATA exponent not valid 106 DECIMAL PROGRAM DATA digit expected 107 DECIMAL PROGRAM DATA digit not expected 108 DECIMAL PROGRAM DATA more than one decimal point 109 DECIMAL
83. UR ASSURER LA PROTECTION FUTURE LE FUSIBLE DE REMPLACEMENT DOIT ETRE AUX MEMES SPECIFICATIONS PER UNA CORRETA PROTEZIONE SOSTITUIRE IL FUSIBILE SOLO CON UNO DI IDENTICO TIPO E POTENZA 2 4 CHAPTER 2 System Overview Rear Panel ILX Lightwave 70032603 Revision 00 GPIB Connector The GPIB connector is located adjacent to the fan on the right hand side of the rear panel It is compliant with ANSI IEEE Standard 488 1 1987 Interface specifications are listed in Table 8 1 It is possible to link several FOM 7900B Mainframes together and control them all from one GPIB address RS 232 Connectors The FOM 7900B can be controlled remotely through a serial link between a computer COM port and the FOM 7900B The commands described in CHAPTER 8 GPIB Remote Operation and Common Commands and CHAPTER 9 Command Reference can be sent via GPIB or RS 232 It is possible to link several FOM 7900B Mainframes together and control them all from one RS 232 interface Refer to CHAPTER 7 RS 232 Interface for details regarding RS 232 communications to the FOM 7900B Trigger Input Output Connectors E The TRIGGER IN may be used to externally signal modules to execute a predetermined set of instructions The input signal is active low edge triggered TTL with a minimum pulse width of 100ns All modules will receive the trigger pulse but not all modules support the external trigger Some modules are capable of generating a
84. US User s Guide ulti Channel Fiber Optic Test System FOM 7900B D also includes S 79800E Fiber Optic Source Module NL Lic oves Photonic Test amp Measurement Instrumentation Lightwave Corporation O Box 6310 Bozeman MT U S A 59771 U S amp Canada 1 800 459 9459 International Inquiries 406 586 1244 Fax 406 586 9405 E mail support ilxlightwave com www ilxlightwave com 70032603 1 02 ILX Lightwave 70032603 Revision 00 FEEDBACK To ensure that you get the most out of your ILX Lightwave product we ask that you direct any product operation or service related questions or comments to ILX Lightwave Customer Support You may contact us in whatever way is most convenient Telephone 800 459 9459 FAX 406 586 9405 E mail support ilxlightwave com CS webpage _http ilx custhelp com cgi bin ilx cfg php enduser home php Mail 31950 East Frontage Road Bozeman Montana USA 59715 When you contact us please have the following information Model Number Serial Number End user name and telephone fax Name Company Phone Fax Description or sketch of what is connected to the ILX Lightwave instrument Description of the problem If ILX Lightwave determines that a return to the factory will be necessary you will be issued a Return Authorization RA number Please mark this number on the outside of the shipping box NOTE The shipping bo
85. a response terminator where the response data represents the presence of the source shutter 1 for installed and 0 for not installed 9 56 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 POINTS OF INTEREST This command returns presence of the source shutter The state of the shutter is set with the SHUTTER command and the laser is energized with the OUT command EXAMPLES SHUTPRES 1 means the source shutter option is installed SHUTPRES 0 means the source shutter option is not installed X Front Panel SOURCE X Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The SOURCE command is used to select the modulation source as INTERNAL or EXTERNAL SYNTAX DIAGRAM PARAMETERS The lt nrf gt is a 0 for internally generated modulation or a 1 for external modulation POINTS OF INTEREST This command is used to select the source of the modulation signal that goes to each module INTERNAL modulation is generated within the FOM 7900B Mainframe EXTERNAL modulation is provided to the mainframe through a rear panel BNC connector EXAMPLES SOURCE 0 The modulation source is internal SOURCE 1 The modulation source is external CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 57 ILX Lightwave 70032603 Revision 00 SYNTAX DIAGRAM RESPONSE POINTS OF INTEREST EXAMPLES X Front Panel SOURCE Remote FOM 7
86. acy NIST traceable calibration Reference conditions 2 5 Operating conditions 5 0 Polarization dependent response 0 002dB Measurement repeatability 0 003dB Compatible connector types FC SC Sensor type Temperature controlled InGaAs Noise 150pW p p no filtering Sample rate 150msec Linearity 0 08dB Environment Operating temperature Storage temperature Humidity 10 C to 40 C 40 C to 70 C lt 85 relative humidity non condensing 1 Temperature 23 C 2 C 1000 1600nm spot diameter 1 1mm power 100W 2 Within operating power and temperature ranges specified above Add 1 for NA 20 2 Maximum NA lt 0 30 3 Variation in response from removing and replacing the fiber or connector into the adapter Includes effects of variation in fiber orientation Add 0 003dB for NA gt 0 20 5 4 CHAPTER 5 DPM 79810 MODULE DPM 79810 Specifications ILX Lightwave 70032603 Revision 00 DPM 79810 DUAL POWER METER MODULE The DPM 79810 module contains two optical power meters The top connector on the front of the module is for the first optical power meter called OPM1 and the bottom connector is for the second optical power meter called OPM2 Initial factory settings are shown in Table 5 2 It is recommended that these initial settings are saved in the setup menu Table 5 2 DPM 79810 Module Initial Factory Settings DUAL POWER METER FILTERING 1 No averaging 150msec s
87. ally different than the displayed output level 1 Make sure the patch cord is clean free of defects and properly connected to the 79800E 2 The internal fiber ferrule may be contaminated It may be necessary to clean the fiber optic bulkhead 3 The display calibration may not be accurate Perform a user calibration Try resetting the User Calibration first Measured wavelength is sub stantially different than the displayed setting or the wave length will not tune 1 The display calibration may not be accurate Perform a user calibration Try resetting the User Calibration first Table 13 5 DPM 79810 Dual Power Meter Module Errors EE1 Error Calibration Data corrupted on OPM1 EE2 Error Calibration Data corrupted on OPM2 User Cal1 Active 1 User Cal value set to value other than 1 User Cal2 Active OPM2 User Cal value set to value other than 1 OPM1 ZERO Fail Last Zero operation since power up failed OPM2 ZERO Fail Last Zero operation since power up failed CHAPTER 13 Troubleshooting GPIB Troubleshooting Guide INDEX Calibration Power 11 5 Wavelength 11 5 Customer Service 1 1 v F Front Panel Channel Selection 3 2 Display 3 1 Local Remote 3 2 Parameter Adjustment 3 3 Entry 3 3 Selection 3 2 Sweeping Values 3 3 Fuse Replacement 11 2 G GPIB Commands Common CLS 8 14 ESE 8 14 E
88. ampling MODE 1 Absolute meters operating independently REFERENCE 0 No reference reading stored UNIT Watts WAVELENGTH 1550 000nm RANGE AUTO USER CALIBRATION 1 000 CHAPTER 5 DPM 79810 MODULE DPM 79810 DUAL POWER METER MODULE 5 5 ILX Lightwave 70032603 Revision 00 CONNECTING TO THE POWER METER INPUT PORT Measurements Using a Connector With adapters available from ILX Lightwave the DPM 79810 can make measurements through most common fiber optic connectors To install an adapter screw it onto the front panel detector mount Take care not to contaminate the internal cavity To remove an adapter unscrew the four fasteners Once the adapter is in place you can connect patchcords repeatedly to the meter There is no need to remove the adapter unless you need to use a different connector type NOTE Always clean the tip of the connector ferrule before a measurement using proper tools and good technique The core of a single mode telecom grade fiber is only about 9um in diameter so even the smallest contaminant can cause large errors if it happens to be over the fiber core Protecting the Cavity 5 6 The detector cavity entrance is small 2 5 mm so it will not tend to pick up debris However over time dust and pollution in normal air can degrade measurement accuracy After using the detector protect the detector cavity by covering the entrance with the plastic shipp
89. arameter value by pressing either the UP or DOWN arrow key and the ENTER key simultaneously This provides the capability to sweep over a range of parameter values CHAPTER 3 FOM 7900B Mainframe Operation Front Panel Controls 3 3 ILX Lightwave 70032603 Revision 00 MAINFRAME PARAMETER MENU The FOM 7900B Fiber Optic System Mainframe menu is shown in Table 3 1 Pressing the CHAN UP or CHAN DOWN key until Ch All is shown in the upper left corner of the display accesses the mainframe parameter menu A selection is made by repeatedly pressing the PARAM key until the desired parameter is displayed Table 3 1 Mainframe Parameter Menu Mod Setup Mod Freq Mod Source User Mode Modulation Coherence Ctl Source Output Setup GPIB Address Bank Address User Mode E RROR 3 1 Pressing ENTER at this parameter passes control to the secondary menu 2 Pressing ENTER at this parameter passes control back to the main menu 3 Error messages are displayed only when an error condition exists within the mainframe Modulation Setup CH ALL MOD SETUP PRESS ENTER Press the ENTER key to proceed to the secondary menu structure specific to the setup of the internal external modulation 3 4 CHAPTER 3 FOM 7900B Mainframe Operation Mainframe Parameter Menu ILX Lightwave 70032603 Revision 00 Modulation Frequency CH ALL MOD FREQ 100 00 KHZ Use this parameter to set the internal
90. ature can be used when the measured output power does not match the front panel setting or to compensate for losses induced by patch cords Use the steps below to enter a Power User Calibration This calibration generates a single point offset that is applied to all future power levels 1 Connect an optical power meter to the end of a fiber optic patch cord Program the power meter to the wavelength of the FOS 79800E Pre cision Fiber Optic Source Zero the power meter 2 Setthe FOS 79800E Precision Fiber Optic Source Module to a level near that of the test application Turn the source on 3 Proceed to the Cal Level display 4 Give the system one hour to warm up and stabilize Measure the out put power with the power meter Then use the LEFT and RIGHT arrow keys to move the cursor and the UP and DOWN arrow keys to enter the measured power from the power meter Then press the ENTER key CHAPTER 4 FOS 79800E Module FOS 79800E Source Module Parameter menu 4 7 ILX Lightwave 70032603 Revision 00 Calibrate Wavelength CH1 CAL WAVELENGTH 1554 001 NM The Cal Wavelength feature can be used when the measured wavelength does not match the front panel setting Use the steps below to enter a Wavelength User Calibration The cal generates a single point offset that is applied to all future wavelength settings 1 Connect a wavelength meter to the end of a fiber optic patch cord 2 Setthe FOS 79800E Fiber Optic Source Module to a wa
91. calibration is not active OPM1 CAL 2 0 The user needs the actual measurement value doubled X Front Panel CAL LEVEL X Remote FOM 7900B Y FOS 79800E FOS 79710 DPM 79810 The CAL LEVEL command is used to field calibrate the output power SYNTAX DIAGRAM PARAMETERS nrf value is the actual measured output power from the module 9 10 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference POINTS OF INTEREST EXAMPLES SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES ILX Lightwave 70032603 Revision 00 The User Calibration can be used when the measured output power does not match the front panel setting or to compensate for losses induced by patch cords Use the CAL LEVEL command to enter the measured power in dBm for a particular channel The effects of the User Calibration are removed with the CAL RESET command CAL LEVEL 1 12 Resets the measurement to 1 12 dBm X Front Panel CAL RESET X Remote FOM 7900B x4 FOS 79800E FOS 79710 DPM 79810 The CAL RESET command removes the effects of the Power and Wavelength User Calibrations POP POs None The User Calibration is an offset that is applied to all future power levels and wavelength settings Resetting the User Calibration returns these offsets to 0 00 dB and 0 000 nm CAL RESET Removes the effects of the User Calibrations CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 11
92. cates that both optical power meters are set to automatically range based on their measured optical input power OPM1 RANGE 1 The range for the first optical power meter is fixed to measure optical powers in the range from 1Watt to 100milliwatts 9 44 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 X Front Panel RECALL Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The OPM1 RECALL command restores the user settings for the selected optical power meter stored at the indicated bin location SYNTAX DIAGRAM white space PARAMETERS An nrf value values 1 10 indicating the storage bin POINTS OF INTEREST The user can restore stored settings that have been previously been saved to a storage bin It will be necessary for the user to remember where each of the desired settings have been previously saved EXAMPLES OPM1 RECALL 1 Restores the user settings for the first optical power meter previously stored in bin number 1 X Front Panel REFerence Remote FOM 7900B FOS 79800E FOS 79710 Y DPM 79810 The BOTH REFerence and OPM1 REFerence commands enable or disable a reference measurement in which the optical power meters measures a delta in optical power The established reference power will be measured and stored when the reference command is received and the remaining measurements will be reported as the delta in the current optical p
93. compound command program header Some of the FOM 7900B remote commands require a compound structure This is done to distinguish between different commands of the same type The compound command structure is similar to a directory path structure as found in DOS For example commands which deal with FOM 7900B calibration have the path CAL as in the command to calibrate the display to a known output power CAL LEVEL 0 5 A compound command program header is a compound command heading which may be followed by program data parameters A compound command or compound command program header is similar to a path for a file that starts with the root directory and lists the intermediate subdirectories The syntax for a compound command program header is shown in FIGURE 8 5 The syntax diagram for a compound query program header is shown in FIGURE 8 6 E program J lt program mnemonic gt FIGURE 8 5 lt compound command program header gt CHAPTER 8 GPIB Remote Operation and Common Commands ANSI IEEE 488 2 Definitions ILX Lightwave 70032603 Revision 00 Re lt mnemonic is mnemonic FIGURE 8 6 lt compound query program header gt A lt program mnemonic gt is a command or command path identifier For example the lt PROGRAM MESSAGE gt ENABLE COND 256 consists of the command COND and the path identifier ENABLE All of the legal lt compound command pr
94. d use latter An nrf value values 1 10 indicating the storage bin This feature allows users to save their specific settings to be recalled and used at a latter time The user must remember which of the ten bins in which the settings have been saved OPM1 SAVE 1 Saves the current user settings for the first optical power meter to storage bin number 1 Front Panel SECURE X Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The SECURE command allows the service technician access to the protected user data command PUD This data is normally changed at the factory so the SECURE command is not needed by the user CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES SYNTAX DIAGRAM PARAMETERS ILX Lightwave 70032603 Revision 00 X Front Panel SEQ DEFAULT X4 Remote FOM 7900B FOS 79800E Y FOS 79710 DPM 79810 The SEQ DEFAULT command initializes the switch sequence array to its default sequence None This command initializes the trigger timer switch sequence array to the following default sequence 1225354 SEQ DEFAULT Initializes the trigger timer switch sequence X Front Panel SEQ SWn X Remote FOM 7900B FOS 79800E x FOS 79710 DPM 79810 The SEQ SWn command is used to set the nth switch position in the trigger timer sequence array where the array index n is between 1 and 4 n is the array i
95. ds gt gt REMOTE lt lt and the front panel is disabled Press the LOCAL key to return to local front panel control When the instrument is in local mode pressing the LOCAL key causes the GPIB address to be displayed The GPIB address can then be changed by pressing the UP and DOWN arrow keys to select the desired address The new address is implemented when the ENTER key is pressed Use the CHAN UP or CHAN DOWN keys to select one of the eight modules in the FOM 7900B Mainframe When a module is selected parameters for that module are displayed on the FOM 7900B front panel Repeatedly press the PARAM key to view the adjustable parameters for the selected module CHAPTER 3 FOM 7900B Mainframe Operation Front Panel Controls ILX Lightwave 70032603 Revision 00 Parameter Adjustment The LEFT and RIGHT arrow keys are used to place the cursor at a specific position in the adjustable parameter The UP and DOWN arrow keys are used to increase decrease the value of the displayed parameter highlighted by the cursor Changes made to the parameter are not implemented until the ENTER key is pressed e efe e Parameter Entry The ENTER key must be pressed after editing to apply ENTER changes to the displayed parameter Editing sessions are automatically cancelled if the ENTER key is not pressed within 3 seconds of changing the parameter Sweeping Parameter Values It is possible to rapidly adjust and implement changes to a p
96. dulation Out signal can be used as an external signal to synchronously modulate other FOM 7900B mainframes or to trigger peripheral test equipment 2 6 CHAPTER 2 System Overview Rear Panel ILX Lightwave 70032603 Revision 00 MODULE INSTALLATION Use the following instructions when installing modules into the FOM 7900B Mainframe PEN 1 Make sure the power to the FOM 7900B Mainframe is turned off CAUTION Do not insert or remove any module while the FOM 7900B is powered up This could damage the module and or mainframe Be sure the module is properly installed before applying power to the FOM 7900B CAUTION The Fiber Optic Source Module and the Dual Power Meter are static sensitive devices Installing or removing any module from the FOM 7900B System should take place at an ESD protected workbench The operator should be properly earth grounded 2 Select any available mainframe channel and if necessary remove the blank plate that covers that channel The plate is removed by loosening the screw at the bottom left corner NOTE The DPM 79810 occupies two channels 3 Position the module upright and guide it into the bay using the mount ing rails on the top and bottom of the mainframe bay 4 Press the module firmly into the bay The module should snap securely into place 5 Secure the module using the screw at the bot
97. e current power BOTH REFerence measurement as a reference value The remaining measurements when a reference is recorded become the difference in power The valid parameter for this command is ON or OFF OPMn REFerence NONE Returns the reference power BOTH REFerence measurement 0 0 is the default value and indicates no stored reference is being used OPMn RELative NONE Returns the relative power difference between OPMn and the other optical power meter OPMn UNITS DBM 1 Sets the optical power meter to BOTH UNITS DBM display and respond in dBm units or Watts OPMn UNITS DBM NONE Returns the current unit setting BOTH UNITS DBM for the optical power meter OPMn WAVEIength 1 Sets the input wavelength that BOTH WAVElength the optical power meter is reading OPMn WAVElength NONE Returns the current wavelength BOTH WAVEIength setting for the optical power meter OPMn ZERO NONE Zeros the optical detector and BOTH ZERO electronics for the optical power meter CHAPTER 5 DPM 79810 MODULE COMMAND REFERENCE 5 17 ILX Lightwave 70032603 Revision 00 5 18 Table 5 4 DPM 79810 Module Commands NAME PARAMETERS FUNCTION OPMn ZERO NONE Returns the status of the BOTH ZERO zeroing operation on the optical power meter OPMn SAVE 1 Saves the current meter settings for both OPM1 and 2 to a storage bin indicated by the parameter The valid parameter range for this command is 1 10
98. e current power reading When displaying the power reading the reference power will be contained in parenthesis The lack of a displayed reference reading indicates the measurement is in absolute non referenced mode Select Reference using the PARAM key from the SETUP menu Use the UP or DOWN arrow key to cycle between ON and OFF When ON is selected the power reading when the ENTER key is pressed becomes the new reference power To disable the reference power select OFF and press the ENTER key Reference value is stored when power is turned off Range Setting CH 1 OPM1 RANGE RANGE AUTO The optical power meter provides eight individual settings to cover the full optical power measurement range Select Range using the PARAM key from the SETUP menu Use the UP or DOWN arrow key to select the range setting Press the ENTER key The available range settings are AUTO 1W 100mW 10mW 1mW 100mW 10mW 1mW and 100nW When AUTO is selected the optical power meter automatically changes to the appropriate range setting based on the measured power The user can force the meter to a fixed range maximum range by entering one of the eight available power ranges Within each range accuracy is 5 0 CHAPTER 5 DPM 79810 MODULE Operating Parameters Setup 5 13 ILX Lightwave 70032603 Revision 00 User Calibration CH 1 OPM1 USERCAL 1 000 The user calibration sets a multiplication factor that is applied to the measurements Select U
99. e for that particular type of register For example suppose the internal modulation on condition is enabled and that condition occurs then bit 1 of the Status Byte Register would be set Device Dependent Event and Condition Registers 8 24 The Event Registers are used to report events which occur during the operation of the instrument Events differ from conditions in that events signal an occurrence once and are not reset until the Event Register is queried or the FOM 7900B is powered off Conditions reflect the current state of the device and therefore may change many times during operation Querying a Condition Register does not change its contents CHAPTER 8 GPIB Remote Operation and Common Commands Error Messages ILX Lightwave 70032603 Revision 00 Operation Complete Definition Note that bit 0 of the Standard Event Status Register contains the Operation Complete flag see OPC on page 8 17 This bit may be used to signal an SRQ to the controlling software for more efficient interrupt driven software Enable the SRQ by setting bit 0 in the Standard Event Status Enable Register ESE and bit 5 in the Service Request Enable Register SRE This may be used to initiate service request routines which depend on the completion of all previous commands Condition Status Register COND 4 Event Status Register EVE Module 1 Present 15413121110 o e 716 5 4 13 211 Jo NIA Module 2 Present N A
100. eal damage The ANSI publication Z 136 1 The Safe Use of Lasers lists Maximum Permissible Exposure MPE levels for direct or intrabeam viewing of laser beams From the MPE levels a hazard zone may be computed for a particular laser and exposure time For more information concerning lasers and laser diode safety contact the Center for Devices and Radiological Health or ILX Lightwave CHAPTER 2 System Overview Power Up CHAPTER 3 ILX Lightwave 70032603 Revision 00 FOM 7900B MAINFRAME OPERATION FRONT PANEL CONTROLS Display Three modules are available for use in the FOM 7900B mainframe the FOS 79800E Fiber Optic Source module the FOS 79710 Fiber Optic Switch and the DPM 79810 Dual Power Meter All are controlled using the mainframe keypad Details unique to individual modules are described in the corresponding module chapter BnF q Lightwave 7900BSYSTEM GPIB PARAMETER SETUP ae ee om es POWER The selected module channel number is always shown in the upper left corner of the display A description of the selected parameter is provided in the upper right corner of the display CHAPTER 3 FOM 7900B Mainframe Operation 3 1 ILX Lightwave 70032603 Revision 00 3 2 Local Remote Control GPIB Channel Selection CHAN UP DOWN CHAN Parameter Selection When the 7900 is addressed remotely by a host computer the display rea
101. egister Whenever there is any error message in the Error Queue bit 7 is set in the Status Byte Register INPUT BUFFER AND OUTPUT DATA The input buffer is 256 bytes long and the lt PROGRAM MESSAGE gt must not exceed this length The output buffer is also 256 bytes long The user may enter as many queries as is desired in a single input message and the FOM 7900B responds to all of them in the same output message if possible All query responses are evaluated at the time the query is parsed and not at the time the response message is sent In most cases this does not create a problem since the time between parsing a query and sending its response is small unless the GPIB controller takes a long time to request the response REMOTE INTERFACE MESSAGES 8 26 The following sections are intended as a reference for using the FOM 7900B with the GPIB option when an understanding of the lower level interface messages is required These sections deal with the remote interface messages which are available with the instrument and they contain a list of the Interface Function subsets This information is generally not required by the user unless there is a question of compatibility of the instrument with a specific controller A list of interface messages which are not supported by the FOM 7900B is shown in Table 8 8 These messages will be ignored by the FOM 7900B The interface messages listed in this chapter are handled by the National Instru
102. el or whenever the TRIG command is sent through GPIB EXAMPLES SEQ TRG 0 The external trigger mode is disabled SEQ TRG 1 The external trigger mode is enabled CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 53 ILX Lightwave 70032603 Revision 00 Front Panel SERNUM X Remote FOM 7900B Y FOS 79800E FOS 79710 DPM 79810 The SERNUM query returns the serial number of the source module To query the mainframe serial number refer to the common command IDN on page 8 16 To query the power meter serial number refer to the device dependent command IDN on page 9 28 vor ere PARAMETERS None SYNTAX DIAGRAM RESPONSE response data response terminator where the response data is the serial number of the module EXAMPLES SERNUM F109 The module serial number if F109 X Front Panel SHUTTER X Remote FOM 7900B Y FOS 79800E FOS 79710 DPM 79810 SYNTAX DIAGRAM 9 54 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 PARAMETERS lt nrf value is the desired state of the source shutter 1 0ON for open and 0 OFF for shut POINTS OF INTEREST Use this command to set the state of the source shutter The laser is energized by using the OUT command The laser must be energized and the source shutter must be open for light to emit from the connector EXAMPLES SHUTTER ON The source shutter is opened
103. ent 1024 Not Used 8 Module 4 Present 2048 Not Used 16 Module 5 Present 4096 Not Used 32 Module 6 Present 8192 Not Used 64 Module 7 Present 16384 Not Used 128 Module 8 Present 32768 Not Used POINTS OF INTEREST The condition enable register can be set by using the ENABle COND command The condition status can be monitored by the COND command Refer to the Status reporting diagram in FIGURE 8 11 EXAMPLES ENAB COND 144 the presence of module 5 and 8 are allowed to be summarized in the Status Byte CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 19 ILX Lightwave 70032603 Revision 00 SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES 9 20 Front Panel ENABle EVEnt Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The ENABle EVEnt command sets the event status enable register This register is a filter which is logically ANDed to the event register If the result is non zero bit 0 in the Status Byte is set to one The nrf value whose sum represents the enabled bits below 1 Not Used 256 Modulation ON OFF 2 Not Used 512 Sources ON OFF 4 Not Used 1024 Not Used 8 Not Used 2048 Not Used 16 Not Used 4096 Not Used 32 Not Used 8192 Not Used 64 Not Used 16384 Not Used 128 Not Used 32768 Not Used The event enable register can be read using the ENABle EVEnt query The event status register can be m
104. er gr GPIB enabled RS232 enabled MMDDYY Date of factory calibration ABC Initials of calibrating technician RST The RESET command performs a device reset The Operation Complete Command Idle State OCIS is the state which the FOM 7900B is in when it is no longer waiting for any operation to complete after an DPC command has been executed The Operation Complete Query Idle State OQIS is the state which the FOM 7900B is in when it is no longer waiting for any operation to complete after an OPC query has been executed These idle states allow the FOM 7900B to complete it s reset process before continuing with any other commands after the RST is executed Table 8 2 describes the state of the FOM 7900B following the RST command CHAPTER 8 GPIB Remote Operation and Common Commands Common Commands and Queries ILX Lightwave 70032603 Revision 00 SYNTAX HS SRE The SERVICE REQUEST ENABLE command sets the Service Request Enable Register bits to allow the FOM 7900B to generate the user selectable service requests SRQ The Service Request Enable Register is logically ANDed to the Status Byte If the result is non zero then bit 6 of the Status Byte is set to 1 and an SRQ interrupt is initiated where the lt integer nrf gt is the binary integer sum of the enabled bits FIGURE 8 10 SYNTAX SRE The SERVICE REQUEST ENABLE QUERY allows the user to deter
105. er User Calibration can be used when the measured output power does not match the front panel setting or to compensate for losses induced by patch cords Use the steps below to enter a Power User Calibration This calibration generates a single point offset that is applied to all future power levels 1 Connect an optical power meter to the end of a fiber optic patch cord that is also connected to the 79800E Precision Fiber Optic Source Program the power meter to the wavelength of the 79800E Zero the power meter Set the 79800E Precision Fiber Optic Source Module to a level near that of the test application Turn the source on Proceed to the Cal Level display Give the system enough time to warm up and stabilize Measure the output power with the power meter Enter this power measurement as the Cal Level value CHAPTER 11 Maintenance User Calibration of the FOS 79800E Module 11 5 ILX Lightwave 70032603 Revision 00 page left blank intentionally 11 6 CHAPTER 11 Maintenance User Calibration of the FOS 79800E Module CHAPTER 12 ILX Lightwave 70032603 Revision 00 ERROR MESSAGES Error messages may appear on the display when problems occur within the FOM 7900B Error messages are shown on the front panel display In remote operation the current error list can be read by issuing the ERR query When this is done a string is returned containing all of the error messages that are currently in the error message queue
106. er is configured properly Bus hangs 1 Place a software timeout around the command in question to prevent the hang 2 Check the syntax of the command that is causing the hang especially if the command is a query and software is waiting for a response 3 Make sure the controlling software is not requesting information from the FOM 7900B without first sending the proper query 4 Make sure the GPIB controller card in the host computer is configured properly 5 Check the GPIB cables and the GPIB address CHAPTER 13 Troubleshooting GPIB Troubleshooting Guide 13 3 ILX Lightwave 70032603 Revision 00 13 4 Table 13 3 FOS 79710 Switch Module Errors SYMPTOM CAUSES AND CORRECTIVE ACTIONS Persistent ERROR 504 1 Power down the FOM 7900B Remove the Switch module and reinsert it Ensure the module is seated well into the FOM 7900B Mainframe Power up the FOM 7900B and recheck the switch module for ERROR 504 2 Call ILX Lightwave customer service Unstable power levels or 1 It may be necessary to clean the fiber unequal power from differ optic bulkhead connectors on the front ence ports panel of the module 2 Make sure the input source to the switch module is stable CHAPTER 13 Troubleshooting GPIB Troubleshooting Guide ILX Lightwave 70032603 Revision 00 Table 13 4 FOS 79800E Source Module Errors SYMPTOM CAUSES AND CORRECTIVE ACTIONS ER
107. ger Switch Sequence 6 5 Return to Main m 6 6 Select Timed Mode 6 6 Enable Interval 6 6 Set Interval Time a o eit ett Repo 6 7 Initialize Timer Switch Sequence 6 7 Customize Timer Switch Sequence 6 7 Return to Main 6 8 Error Display feed ede ee mb M 6 8 External Trigger Specifications 2 1 0808 6 9 ILX Lightwave 70032603 Revision 00 CHAPTER7 RS 232 INTERFACE RS 232 Communications 7 1 Linking Multiple FOM 7900B Systems 7 1 Communication with multiple FOM 7900B systems 7 3 CHAPTER8 GPIB REMOTE OPERATION AND COMMON COMMANDS 7900 and GPIB Controller Synchronization 8 2 Preparation for GPIB Control 8 2 LOCAL Control 8 2 REMOTE Conttoll eae 8 2 GPIB AddreSS 2i rtc ratte Has eeu Le 8 3 ANSI IEEE 488 2 Definitions 8 3 syntax Diagrams 8 3 white SDaCe eda e tate ha Lie oca age ca Ya 8 4 nr Value etude oe i inane ade ces
108. guide for front panel operation of the mainframe CHAPTER 4 FOS 79800E Module This chapter is a guide for front panel operation of the source module CHAPTER 5 DPM 79810 MODULE This chapter is a guide for front panel operation of the dual power meter module CHAPTER 6 FOS 79710 Module This chapter is a guide for front panel operation of the 1 x 4 switch module CHAPTER 7 RS 232 Interface This chapter is an overview of the RS 232 interface CHAPTER 8 GPIB Remote Operation and Common Commands This chapter is a guide to the syntax and usage of the various IEEE 488 2 common commands It also includes hardware diagrams and other information relating to remote operation 1 2 CHAPTER 1 INTRODUCTION Summary of Instruction Manual ILX Lightwave 70032603 Revision 00 CHAPTER 9 Command Reference This chapter is a guide to the syntax and usage of the various device dependent commands for the FOM 7900B System CHAPTER 10 Programming Examples This chapter provides FOM 7900B programming examples using GPIB commands CHAPTER 11 Maintenance This chapter describes how to maintain the FOM 7900B System CHAPTER 12 Error Messages This chapter provides information on error messages and warnings CHAPTER 13 Troubleshooting This chapter is intended to be used as a guide when the FOM 7900B mainframe or modules do not perform as expected CHAPTER 1 INTRODUCTION Summary of Instruction Manual 1 3 ILX Lightwave
109. h Parameter Menu 6 3 External Trigger Specifications 6 9 FOS 79710 1 x 4 Switch Module Commands 6 10 RS 232 Parameter 7 1 RS 232 Connector 7 2 GPIB Capability 8 1 FOM 7900B Default 8 9 Valid Syntax for 8 10 Invalid Syntax for 5 8 11 Substitute Parameter Names 8 11 GPIB Common 8 13 FOM 7900B Allowed GPIB Interface Messages 8 27 GPIB Interface Messages Not Supported 8 27 FOM 7900B Mainframe Specific Commands 9 4 FOS 79800E Module Commands 9 5 FOS 79710 1 x 4 Switch Module Commands 9 6 DPM 79810 Module Commands 9 7 FOM 7900B Channel Numbers 9 13 Error Codes for the FOS 79710 1 X 4 Switch Module 9 23 Error Codes for the FOS 79800E Source Module 9 23 Mainframe Specific Errors 9 23 GPIB Drivers air REPRE 10 1 Display 10 2 Error Code
110. h in nanometers POINTS OF INTEREST The wavelength is set with the WAVE command and cannot be less than the WAVEMIN value EXAMPLES WAVEMIN 1549 308 the minimum wavelength is set to 1549 308 nm CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 71 ILX Lightwave 70032603 Revision 00 SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST 9 72 EXAMPLES X Front Panel ZERO Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The BOTH ZERO and OPM1 ZERO commands instruct the meter to perform a zeroing operation to calibrate both optical and electronic offsets An nrf value 1 start zero operation 0 abort zero operation in process This feature applies an offset correction factor to the internal amplifiers that eliminates detectable fixed errors These errors can be from internal effects such as detector dark current as well as from external effects such as ambient light The concept is similar to shorting the lead of a voltmeter and making sure the meter reads zero Best results will always be obtained by minimizing external influences because they are rarely stable For this reason the DPM 79810 limits the amount of acceptable zero offset Caution should be exercised when using this command the optical input must be sealed from ambient light and no optical source signal can be present BOTH ZERO 1 Instructs both optical power meters to perform the zeroing operation OPM1 ZERO 0
111. have this feature and will not be affected EXAMPLES COH 1 turns the coherence control feature on COHERENCE OFF turns the coherence control feature off Front Panel COHerence X Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The COHerence query returns the ON OFF status of the coherence control feature PARAMETERS None SYNTAX DIAGRAM CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 15 ILX Lightwave 70032603 Revision 00 RESPONSE lt response data gt lt response terminator gt where the response data is a 1 ON or 0 OFF POINTS OF INTEREST Use COHerence to verify the state of the coherence control feature EXAMPLES COH 0 coherence control is turned off Front Panel CONDition X Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The COND query returns the value of the FOM 7900B condition status register SYNTAX DIAGRAM TORORO PARAMETERS None RESPONSE lt response data gt lt response terminator gt 9 16 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 where the response data is the binary sum of the following 1 Module 1 Present 256 Modulation On 2 Module 2 Present 512 Sources On 4 Module 3 Present 1024 Not Used 8 Module 4 Present 2048 Not Used 16 Module 5 Present 4096 Not Used 32 Module 6 Present
112. he high brightness sometimes invisible light output of laser diodes and other laser sources pose a definite eye hazard Direct viewing of the laser output can produce retinal or corneal damage Absorption of the laser light by the eye causes localized heating and denaturing of tissue proteins The ANSI publication Z 136 1 The Safe Use of Lasers lists Maximum Permissible Exposure MPE levels for direct or intrabeam viewing of laser beams From the MPE levels a hazard zone may be computed for a particular laser and exposure time For more information concerning lasers and laser diode safety contact the Center for Devices and Radiological Health or ILX Lightwave Laser Warning Label IEC Triangle Visible and or invisible laser radiation Avoid direct eye exposure to the beam vii ILX Lightwave 70032603 Revision 00 page left blank intentionally viii ILX Lightwave 70032603 Revision 00 CONTENTS Calibration and V PRODUCT SAFETY INFORMATION eee mene vi LASER SAFETY FOR THE 79800 vii Laser Warning vii CHAPTER1 INTRODUCTION Company and Technology Overview 1 1 Product QOVOrVIeW tbe LEG Ra RE 1 1 Available edet etre Ree tte ER 1 1 Summary of Instruction Manua
113. ing protector over the connector or leave the connection in place Cavity contamination can also happen if you are doing environmental testing where humidity causes condensation If you suspect the cavity has been contaminated contact ILX Lightwave Customer Service In most cases we will be able to clean it and recalibrate it for you CHAPTER 5 DPM 79810 MODULE Connecting to the Power Meter Input Port ILX Lightwave 70032603 Revision 00 DPM 79810 DUAL POWER METER MODULE PARAMETER MENU Both optical power meters OPM1 and OPM2 in the module should be programmed before operation The various measurement parameters can be set the same for both OPM1 and or OPM2 via the SETUP BOTH menu which is accessed through the first level menus when the PARAM key is pressed with the power meter channel selected Alternatively the control parameters for each individual optical power meter can be set independently with the SETUP OPM1 and SETUP OPM2 channel setup menus which are accessed with the PARAM key when the power meter channel has been previously selected You can move between the multiple parameter options of any setup menu by first selecting the desired optical power meter SETUP then pushing the PARAM key to cycle through each of the individual options The selected parameter value can be adjusted using the UP or DOWN arrow keys The ENTER key must be pressed after entering a new value or the value will revert to the previous value To step back
114. ion 00 page left blank intentionally ILC LAS nia ILX Lightwave Corporation 31950 East Frontage Road Bozeman Montana USA 59715 Phone 406 586 1244 Fax 406 586 9405 www ilxlightwave com
115. ired parameter is displayed Table 6 2 FOS 79710 1 x 4 Switch Parameter Menu 79710 Ver 2 0 Output Port Triggered Trigger Enable Sequence 1 gt 4 Step 1 Port Step 2 Port Step 3 Port Step 4 Port User Mode Timed Timer Enable Time Interval Sequence 1 4 Step 1 Port Step 2 Port Step 3 Port Step 4 Port User Mode XE RROR 3 1 Pressing ENTER at this parameter passes control to the secondary menu 2 Pressing ENTER at this parameter passes control back to the primary menu 3 Error messages are displayed only when an error condition exists in the module CHAPTER 6 FOS 79710 Module FOS 79710 Parameters 6 3 ILX Lightwave 70032603 Revision 00 Module Identification CH 1 79710 VER 2 0 1 X 4 FIBER SWITCH This parameter displays the model number firmware version number and a description of the module The parameter is not adjustable The arrow keys and ENTER key are disabled Select Switch Port OUTPUT PORT 2 This menu is used to determine which port 1 4 or None is switched to the common port top connector The number displayed on the bottom line indicates the current port Use the UP and DOWN arrow keys to select a new port then press the ENTER key to activate the change Selecting None places the switch into the optically off blocked position For laser safety reasons the FOS 79710 Switch Module always powers up in the None position
116. ision 00 page left blank intentionally xviii LIST OF TABLES xix Table 1 1 Table 3 1 Table 4 1 Table 4 2 Table 4 3 Table 4 4 Table 4 5 Table 4 6 Table 5 1 Table 5 2 Table 5 3 Table 5 4 Table 6 1 Table 6 2 Table 6 3 Table 6 4 Table 7 1 Table 7 2 Table 8 1 Table 8 2 Table 8 3 Table 8 4 Table 8 5 Table 8 6 Table 8 7 Table 8 8 Table 9 1 Table 9 2 Table 9 3 Table 9 4 Table 9 5 Table 9 6 Table 9 7 Table 9 8 Table 10 1 Table 10 2 Table 12 1 Table 12 2 Table 12 3 Table 12 4 Table 12 5 Table 12 6 Table 12 7 Table 13 1 Table 13 2 ILX Lightwave 70032603 Revision 00 Module Options 1 1 Mainframe Parameter 3 4 DFB Source Modules 4 2 79800E Performance Specifications 4 3 Module General 4 4 55 810 Source Shutter Specifications 4 4 FOS 79800E Parameter 4 5 FOS 79800E Module Commands 4 10 DPM 79810 MODULE SPECIFICATIONS 5 4 DPM 79810 Module Initial Factory Settings 5 5 DPM 79810 Parameter 5 7 DPM 79810 Module Commands 5 16 FOS 79710 Performance Specification 6 2 FOS 79710 1 x 4 Switc
117. keys to select ON or OFF Then press the ENTER key to implement the change Coherence Control ON OFF In single mode fiber applications light from narrow linewidth sources will remain coherent even after traveling long distances This coherence can cause interference between reflective surfaces such as FC PC interfaces downstream from the optical source This interference is most noticeably seen as power instability Enabling coherence control broadens the linewidth of the laser thus decreasing the source s coherence length and minimizing the associated interference effects The coherence control feature also minimizes the nonlinear effects seen in fiber optic systems due to Brillouin scattering CHALL COHERENCE CTL ON Use this parameter to enable or disable coherence control in all source modules Use the UP or DOWN arrow keys to select ON or OFF Then press the ENTER key to implement the change Sources ON OFF 3 6 CH ALL SOURCE OUTPUT OFF Use this parameter to turn all source module outputs on or off Use the UP or DOWN arrow keys to select ON or OFF Then press the ENTER key to implement the change The green LEDs on the front of all source modules indicate the state of the sources There is a three second safety startup when the outputs are turned on During the startup period the front panel ON LEDs blink rapidly CHAPTER 3 FOM 7900B Mainframe Operation Mainframe Parameter Menu ILX Lightwave 70032603 Revision 0
118. l 1 2 CHAPTER2 SYSTEM OVERVIEW FOM 7900B System Characteristics 2 1 FOM 7900B System Specifications 2 2 Internal Modulation ertet eden bet 2 2 eR 2 2 Modulation 2 2 2 External Trigger 2 3 Computer Interface 2 3 GPIB IEEE 488 2 iva a ne iden 2 3 9 232 5 udi etu deste keen eei te Ron 2 3 IearPanel cdi 2 4 Power Entry Module and Fuse eem 2 4 Fise Rating cene attese eee Lecco leat saecu 2 4 GPIB Connector iacente pet eeu onn tea 2 5 RS5 232 Connectors 2 omnino note int ee 2 5 Trigger Input Output Connectors 2 2 2 00 2 5 Modulation Input Connector External Modulation 2 5 Modulation Output Connectors 2 6 Module Installation sse 2 7 Power Up ne Hale attests das pean auo 2 8 Warm up and Environmental Considerations 2 8 ILX Lightwave 70032603 Revision 00 CHAPTER 3 FOM 7900B MAINFRAME OPERATION Front Panel Controls 3 roc eee bleed 3 1 Display cette cuss en t et emendet 3 1 Local Remote Control essen 3 2 Channel Selectioh 7 nod emi 3 2 Pa
119. level in dBm The level is set with the LEVEL command EXAMPLES LEVEL 0 50 means the power level is 0 50 dBm Front Panel MESsage Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The MESsage command allows the user to enter an ASCII string of up to 16 non zero characters plus enclosing quotes This command may be useful for storing messages which relate to a test or configuration SYNTAX DIAGRAM PARAMETERS An ASCII string which is 1 to 16 bytes in length POINTS OF INTEREST The message may contain any ASCII character but will be terminated when a NULL terminator character is received If the message has less than 16 bytes the FOM 7900B will fill the remaining message space with the space character After 16 bytes have been entered the FOM 7900B will null terminate the string EXAMPLES MESSAGE This is a test The string This is a test will be stored in non volatile memory MES Test3 The string Test3 will be stored in non volatile memory 9 32 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 Front Panel MESsage Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The MESsage query returns the previously stored message This message will always be 16 bytes long and enclosed in quotes Do not include quotes when counting the characters per PARAMETERS None SYNTAX DIAGRAM RESPONSE response data
120. m commands refer to Mainframe Parameter Menu on page 3 4 The FOS 79800E Precision Fiber Optic Source Module menu is shown in Table 4 5 A selection is made by repeatedly pressing the PARAM key until the desired parameter is displayed Table 4 5 FOS 79800E Parameter Menu 79800E Ver 6 1 Output Source Shutter OPEN SHUT Set Level dBm Set Wavelength nm Cal Cal Level Cal Wavelength Default Cal User Mode E RROR 3 1 Pressing ENTER at this parameter passes control to the secondary menu 2 Pressing ENTER at this parameter passes control back to the main menu 3 Error messages are displayed only when an error condition exists in the module Module Identification CH3 79800E SN XXXX FiberOptic Src 6 1 This parameter displays the model number module serial number and the firmware version The parameter is not adjustable The arrow keys and ENTER are disabled CHAPTER 4 FOS 79800E Module FOS 79800E Source Module Parameter menu 4 5 ILX Lightwave 70032603 Revision 00 4 6 Output ON OFF CH 1 OUTPUT ON Use this parameter to turn the laser output on or off Use the UP or DOWN arrow keys to select ON or OFF Then press the ENTER key to implement the change The green LED on the front of the module indicates the presence of light The green LED will only illuminate if the Output is ON and the Shutter is OPEN Source Shutter OPEN SHUT CH 1 SOURCE SHUTTER OPEN
121. meets ANSI IEEE Std 488 1 1987 Software meets ANSI IEEE Std 488 2 1992 SH1 AH1 T6 L4 SR1 RL1 PPO DC1 DT1 CO E1 E2 RS 232 Baud Rate 9600 Stop Bits 1 Parity None Data Bits 8 Flow Control None RS 232 A Connector 9 pin male D connector RS 232 B Connector 9 pin female D connector CHAPTER 2 System Overview FOM 7900B System Specifications 2 3 ILX Lightwave 70032603 Revision 00 REAR PANEL The following paragraphs describe the rear panel of the FOM 7900B Fiber Optic System The FOM 7900B Mainframe Rear Panel is shown in FIGURE 2 1 FIGURE 2 1 FOM 7900B Fiber Optic System Rear Panel Power Entry Module and Fuse The AC Power Entry Module and fuse are located on the right side of the FOM 7900B rear panel The unit must be connected to a properly rated AC power source in order to operate The AC line voltage is preset at the factory and is not adjustable in the field Permitted fluctuations from rated line voltages are 6 and 10 Fuse Rating Replace fuse only with the specified type and rating as listed on the back panel of your FOM 7900B Instructions for replacing a fuse are found in CHAPTER 11 Maintenance LINE VOLTAGE FUSE 5 X 20mm a ees T 2 0A 250V ee T 1 6A 250V NOTE FOR CONTINUED PROTECTION REPLACE FUSE ONLY WITH SPECIFIED TYPE AND RATING ZUM FORTBESTEHENDEN SCHUTZ ERSETZEN SIE DIE SICHERUNG NUR MIT DEM SPEZIFIZIERTEM TYP AND NENNWERT PO
122. ments TNT4882 GPIB interface and the AMD186EM microcontroller in the FOM 7900B and are transparent to the higher level commands However they may be explicitly used in some GPIB programs A list of the FOM 7900B s allowable interface messages is shown in Table 8 7 CHAPTER 8 GPIB Remote Operation and Common Commands Input Buffer and Output Data ILX Lightwave 70032603 Revision 00 Interface Function Subsets Table 8 1 contains the remote Interface Function Subsets which are supported by the FOM 7900B For more information see the ANSI IEEE 488 1 1987 standard Remote Messages The following list contains GPIB remote messages which are compatible with the FOM 7900B GPIB driver Table 8 7 FOM 7900B Allowed GPIB Interface Messages FOM 7900B ALLOWED GPIB INTERFACE MESSAGES ACG GET MTA SCG UCG ATN GTL OTA SPD UNL DAB IFC PCG SPE UNT DAC LAG REN SRQ DAV LLO RFD STB END MLA RQS TAG Remote Interface Messages Not Supported by FOM 7900B Table 8 8 contains GPIB interface messages which are known to be incompatible with the FOM 7900B Other interface messages which are not listed may also be incompatible with the FOM 7900B Table 8 8 GPIB Interface Messages Not Supported GPIB INTERFACE MESSAGES NOT SUPPORTED BY FOM 7900B DCL NUL PPE PPR4 PPR8 EOS OSA PPR1 PPR5 PPU IDY PPC PPR2 PPR6 SDC MSA PPD PPR3 PPR7 TCT CHAPTER 8 GPIB
123. minates detectable fixed errors These errors can be from internal effects such as detector dark current as well as from external effects such as ambient light The concept is similar to shorting the lead of a voltmeter and making sure the meter reads zero To zero the DPM 79810 Select ZERO METER using the PARAM key from the SETUP menu Make sure your fiber or connector is in place at the detector input then press the ENTER key to zero the optical power meter Monitor the Zero Operation by displaying Power1 or Power2 The display will read 8 888Watts 7 777Watts 6 666Watts etc down to 0 000Watts at which time the updated power measurement will be displayed The procedure takes approximately 10 seconds Best results are obtained by minimizing external influences because they are rarely stable For this reason the DPM 79810 limits the amount of acceptable zero offset Error display ZERO ERROR the WARNINGS display indicates there is too much ambient light for a reliable zero reliable zero NOTE A ZERO ERROR will be displayed when the zero operation is attempted when there is too much ambient light for a CHAPTER 5 DPM 79810 MODULE DPM 79810 Dual Power Meter Module Parameter Menu 5 9 ILX Lightwave 70032603 Revision 00 Mode of Operation CH 1 MODE Absolute The mode of operation determines how the power is displayed Select MODE using the PARAM key Use the UP or DOWN arr
124. mine the contents of the Service Request Enable Register SYNTAX RESPONSE Binary Integer Sum of enabled bits in FIGURE 8 10 The value must be between 0 and 255 CHAPTER 8 GPIB Remote Operation and Common Commands Common Commands and Queries 8 21 ILX Lightwave 70032603 Revision 00 Standard Event Summary ESR MAV Message Available Error Queue Not Empty Not Used Not Used Condition Summary Event Summary 5 4 3 2 1 0 Status Byte Service Request SRQ Qo L2 Logical OR VA 4 3 121110 Service Request Enable Register 5 Bit Reference 0 Event Summary4 Message Available 1 Condition Summary5 Event Status Summary 2 Not Used6 Request Service Master Status Summary 3 Not Used7 Error Message Available FIGURE 8 10 Service Request Enable Register STB The STATUS BYTE QUERY allows the programmer to read the Status Byte described in FIGURE 8 10 RESPONSE Binary Integer Sum between 0 and 255 Refer to FIGURE 8 11 SYNTAX 8 22 CHAPTER 8 GPIB Remote Operation and Common Commands Common Commands and Queries ILX Lightwave 70032603 Revision 00 TRG The TRIGGER command is equivalent to the Group Execute Trigger which sends a trigger signal to all modules in the FOM 7900B Mainframe SYNTAX WAI The WAIT TO CONTINUE command prevents the instrument from executing any further commands until the No Operation
125. mote indicator the system controller your computer does not come on This cable should be less than 3 meters long 2 Check that the GPIB address is set properly and the controlling software is sending commands to the proper address 3 Make sure no two devices have the same GPIB address 4 Check that there are fewer than 15 devices on the bus and there is less than 20 meters of total cable 5 Check that the GPIB controller card in the host computer is configured properly 6 Try isolating the FOM 7900B by removing all other instruments from the bus CHAPTER 13 Troubleshooting GPIB Troubleshooting Guide ILX Lightwave 70032603 Revision 00 Table 13 2 GPIB Troubleshooting SYMPTOM CAUSES AND CORRECTIVE ACTIONS Slow or unexpected response 1 Make sure no two devices have the same to GPIB commands GPIB address 2 Check that there are fewer than 15 devices on the bus and there is less than 20 meters of total GPIB cable 3 Make sure the GPIB controller card in the host computer is configured properly 4 Isolate the FOM 7900B by removing all other instruments from the bus Device does not respond to 1 Read the error queue remotely ERR command remote indicator is The command syntax or command on structure may be in error 2 Read the status byte STB and condition register COND for possible device problems 3 Make sure the GPIB controller card in the host comput
126. ms typical 0 002dB rms 24 hours 0 03dB Attenuation Calibrated range 10dB Full range typical 15dB Accuracy 0 1dB Wavelength SPECIFICATION Available center X Refer to Table 4 1 Resolution 1pm Accuracy 50 pm Stability 15 minutes 3pm 24 hours 5pm Tuning range 0 85nm Spectral width Coherence control OFF lt 30MHz Coherence control ON 1 GHz typical General SPECIFICATION Side mode suppression Signal to background Optical isolation RIN Modulation frequency Optical connector Operating temperature 40dB 454dB typical 30dB 30dB 145dB Hz 1 500 kHz FC APC 15 C 35 C SSE50 Option SPECIFICATION Signal Spontaneous Emission within 100 nm of center wavelength 250dB 1 User specified maximum power level 2 After 1 hour warm up typical Some modules may require longer warm up time For short term stability assume ambient temperature constant within 0 1 C For long term stability assume ambient temperature constant within 1 C CHAPTER 4 FOS 79800E Module FOS 79800E Specifications 4 3 ILX Lightwave 70032603 Revision 00 Defined as APmeas APset from maximum power to 5dB down Other linewidths available Measured at output connector set to maximum power 100nm about center wavelength Measured at output connector Use angled connector patchcords to minimize noise Modulation depth 100 duty
127. n 00 SYNTAX DIAGRAM PARAMETERS RESPONSE POINTS OF INTEREST EXAMPLES Front Panel TIMER Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The TIMER query allows the programmer to determine how much time has passed since the last TIMER query was issued pero None response data response terminator where the response is character data in the form hours minutes seconds Each time the TIMER query is issued the timer is reset to 00 00 00 0 and the elapsed time since the last TIMER query is returned The timer counter is initialized at power up The first time the TIMER query is issued its response is the same as the TIME query The clock turns over after about 1193 hours TIMER 6 24 59 06 6 hours 24 minutes 59 06 seconds have passed since the last TIMER query was issued 9 64 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES SYNTAX DIAGRAM PARAMETERS ILX Lightwave 70032603 Revision 00 Front Panel TRIGger Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The TRIGger command activates the trigger signal down the backplane of the FOM 7900B mainframe and triggers all compatible modules The trigger signal will be sent to all modules within a FOM 7900B mainframe The signal will be present at the TRIGGER OUT connector on the back panel Refer to indi
128. n 00 X Front Panel SEQ TMR Remote FOM 7900B FOS 79800E x FOS 79710 DPM 79810 The SEQ TMR command is used to enable or disable the interval timer mode SYNTAX DIAGRAM PARAMETERS The lt nrf value is a 1 or a 0 to enable or disable the interval timer POINTS OF INTEREST Use this command to enable or disable the automatic switching of the built in timer When the timer is enabled the module will automatically move the switch position to the next port in the trigger timer sequence at the rate determined by the timer interval set by the INTERVAL command EXAMPLES SEQ TMR 0 Timer mode is disabled SEQ TMR ON Timer mode is enabled X Front Panel SEQ TMR Remote FOM 7900B FOS 79800E x FOS 79710 DPM 79810 The SEQ TMR query returns the state of the timer mode enabled or disabled SYNTAX DIAGRAM CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 51 ILX Lightwave 70032603 Revision 00 PARAMETERS None RESPONSE lt response data gt lt response terminator gt where the lt response data gt is a 0 or 1 if the timer mode is disabled or enabled POINTS OF INTEREST Use this command to query the status of the timer mode When the timer is enabled the module will automatically move to the next port in the sequence at the rate determined by the INTERVAL command EXAMPLES SEQ TMR 0 Timer mode is disabled SEQ TMR 1 Timer mode is enabled X
129. n different commands of the same type The compound command structure is similar to a directory path structure as found in DOS For example commands which deal with FOS 79800E calibration have the path CAL as in the command CAL LEVEL 2 50 to calibrate the displayed output power for a FOS 79800E Precision Source Module to 2 50 dBm Table 9 1 lists all FOM 7900B device dependent commands with the full path shown for each command and a brief description Detailed syntax diagrams and descriptions start on page 9 10 Common Commands 9 2 The GPIB Common Commands which are defined by the ANSI IEEE 488 2 1987 standard are described in CHAPTER 8 These commands do not necessarily reflect front panel operations but are useful for generic device control Some of the common commands are useful for advanced programming techniques such as generating service requests SRQ CHAPTER 9 Command Reference Commands and Queries ILX Lightwave 70032603 Revision 00 COMMAND PATH NAME Required letters are shown a in uppercase lower case letters are optional FRONT PANEL gt REMOTE EXECUTION A means the command can be executed in that mode Command mnemonics in front panel local mode may vary DEVICE V means the command is specific to the device COMMAND DESCRIPTION SYNTAX DIAGRAM For Remote Commands PARAMETERS Tells what parameters are expected and their type An nrf value refers to flexible
130. n to the next switch in the sequence at the rate determined by the timer interval The switch sequence is described in by the SEQ SWn commands The time interval range is 1 00 to 60 00 seconds The resolution of the timer is 10 ms however the absolute resolution is 16 ms EXAMPLES INTERVAL 5 55 means the interval timer is set to 5 55 seconds CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES SYNTAX DIAGRAM ILX Lightwave 70032603 Revision 00 X Front Panel LEVEL Remote FOM 7900B x4 FOS 79800E FOS 79710 DPM 79810 The LEVEL command sets the output power level from the fiber optic Source The nrf value is the power level in dBm Use this command to set the output power in dBm The source is enabled and disabled using the OUT command LEVEL 3 00 The output power level is set to 3 00 dBm LEVEL 1 50 The output power level is set to 1 50 dBm X Front Panel LEVEL Remote FOM 7900B Y FOS 79800E FOS 79710 DPM 79810 The LEVEL query returns the output power level setting pero CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 31 ILX Lightwave 70032603 Revision 00 RESPONSE lt response data gt lt response terminator gt where the lt response data gt represents the set power level in dBm POINTS OF INTEREST This command returns the present output power
131. n was detected CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 41 ILX Lightwave 70032603 Revision 00 Front Panel RADix Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The RADix query allows the programmer to determine which radix type for status condition and event query response data is currently selected Decimal binary octal and hexadecimal are allowed 5 SYNTAX DIAGRAM RESPONSE lt response data gt lt response terminator gt where the character response data of DEC means decimal BIN means binary HEX means hexadecimal and OCT means octal POINTS OF INTEREST DEC is the default type The RADix command is used to select the form which GPIB status registers are returned Binary Octal Decimal or Hexadecimal Once changed the new radix will remain in effect until the power is shut off or a new RADix command is issued EXAMPLES RAD Dec The selected radix is decimal RADIX Hex The selected radix is hexadecimal 9 42 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 X Front Panel RANGE X Remote FOM 7900B FOS 79800E FOS 79710 N DPM 79810 The BOTH RANGE and OPM1 RANGE commands set the optical power meter to a given measurement range or set the optical power meter to autorange SYNTAX DIAGRAM PARAMETERS lt nrf value 0 to 8 P
132. nce control feature also minimizes the nonlinear effects seen in fiber optic systems due to Brillouin scattering The Coherence Control is turned ON or OFF within the Ch All menu structure Table 4 6 FOS 79800E Module Commands COMMAND PARAMETERS DESCRIPTION NAME EXPECTED CAL LEVEL THEE Sets the Power User Calibration CAL RESET HHHH Resets the User Calibration CAL WAVE HHHH HHH Sets the Wavelength User Calibration ERRor NONE Returns an error code See CHAPTER 12 IDN NONE Returns a string that identifies the module LEVEL XH HH Sets the output power level LEVEL NONE Returns the output power level OUT Turns the output on and off OUT NONE Returns the ON OFF status of the laser SHUTPRES NONE Returns the presence of the shutter option SHUTTER ON OFF or 1 0 Opens ON and closes OFF the shutter SHUTTER NONE Returns the state of the shutter WAVE HHHH HHH Sets the wavelength WAVE NONE Returns the wavelength setting WAVEMAX NONE Returns the maximum wavelength setting WAVEMIN NONE Returns the minimum wavelength setting CHAPTER 4 FOS 79800E Module Coherence Control ILX Lightwave 70032603 Revision 00 CHAPTER 5 DPM 79810 MODULE The DPM 79810 Dual Power Meter Module is intended for use with the FOM 7900B Fiber Optic Mainframe running firmware Version 3 42 or higher Refer to CHAPTER 2 System Overview for installation instructions The DPM
133. ndex value between 1 and 4 The nrf value is the port value between 0 and 4 where zero denotes the optically off position CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 49 ILX Lightwave 70032603 Revision 00 POINTS OF INTEREST Use this command to customize the switch sequence for the external trigger or internal timer modes This command places the port number into the nth position in the switch sequence array Entering a value here does not change the current switch position but merely places the new switch into the sequence array EXAMPLES SEQ SW1 3 Places port 3 into the first position in the sequence array X Front Panel SEQ SWn X Remote FOM 7900B FOS 79800E x FOS 79710 DPM 79810 The SEQ SWn query returns the port number that is in the nth position in the switch sequence array POX en PARAMETERS None The value n is the switch sequence array index between 1 and 4 SYNTAX DIAGRAM RESPONSE response data response terminator where the response data represents the port number in the nth position of the switch sequence array POINTS OF INTEREST Use this command to query the port number in the nth position of the trigger timer switch sequence array EXAMPLES SEQ SW3 2 Port 2 is in the third position of the switch sequence array 9 50 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revisio
134. nel Synchronization Jitter Connector Modulation Out Level _ Polarity of OUT Polarity of OUT Optical Delay Gate Delay Jitter Square Wave 1 500kHz 50 1 100 lt 250 lt 100ns TTL 1 500kHz 50 1 0 volts Laser turned OFF 5 volts Laser turned ON 1us 100ns lt 50ns BNC female on back panel TTL 0 volts Laser turned OFF 5 volts Laser turned ON 0 volts Laser turned ON 5 volts Laser turned OFF 1us lt 60ns mainframe lt 50ns Input modulation duty cycles other than 50 1 will result in output power inaccuracies 2 Optical Delay is defined as the time between the rising edge of the electrical input modulation signal and the rising edge of the modulated optical output 3 Channel to Channel Synchronization is defined as the maximum variation in optical delay between modules in the same mainframe 4 Jitter is defined as the variation in optical delay for any given module 5 Gate Delay is defined as the time between the input modulation signal and the output modulation signal CHAPTER 2 System Overview FOM 7900B System Specifications ILX Lightwave 70032603 Revision 00 Fanout Capable of driving 3 additional FOM 7900B mainframes in parallel Connector BNC female on rear panel External Trigger Input Output Level TTL Active Low Pulse Width 100ns minimum Connector BNC female on rear panel Computer Interface GPIB IEEE 488 2 Hardware
135. ogram headers gt may be traced by starting from the root node of the command structure and moving down by levels to paths and finally to the command A lt PROGRAM MESSAGE TERMINATOR gt causes the next command search to begin at the root node A leading colon on a lt PROGRAM MESSAGE UNIT gt causes the instrument to begin searching for the command at the root node Otherwise after a semicolon the instrument first searches the most recently used node for the command It continues to search the command tree until it finds a legal command path by searching each previously used node up to the root If no legal path is found the instrument generates an error message lt PROGRAM DATA gt Parameters lt PROGRAM DATA gt parameters may be entered after a command in a lt PROGRAM MESSAGE UNIT gt The lt COMMAND PROGRAM HEADER gt command and first lt PROGRAM DATA UNIT gt parameter must be separated by a lt PROGRAM HEADER SEPARATOR gt white space CHAPTER 8 GPIB Remote Operation and Common Commands ANSI IEEE 488 2 Definitions 8 7 ILX Lightwave 70032603 Revision 00 lt ARBITRARY BLOCK PROGRAM DATA gt This element allows any 8 bit bytes including extended ASCII to be transmitted in a message The syntax for an lt ARBITRARY BLOCK PROGRAM DATA gt element is shown in FIGURE 8 7 The only FOM 7900B command that requires arbitrary block program data is the PUD command non zero digit digi
136. ommand or query sent to empty channel no module installed in channel CHAPTER 12 Error Messages FOM 7900B FIBER OPTIC SYSTEM ERRORS ILX Lightwave 70032603 Revision 00 Table 12 6 Module Specific errors ERROR CODE EXPLANATION 501 Case Temperature Error 79800E and 79880 modules only 502 Temperature Control Error 79800E and 79880 modules only 503 Current Limit Error 79800E and 79880 modules only 504 Self Test Error 79710 507 Single Mode Limit Error 79880 module only 508 Calibration Data Error Calibration data in EEPROM is invalid module must be recalibrated 79800E and 79880 modules only Contact ILX Lightwave Customer Service 509 Setpoint Read Error Invalid setpoints stored in EEPROM set points are reset to module defaults 79800E and 79880 modules only Table 12 7 FOS 79710 Switch Error Messages ERROR CODE DESCRIPTION 123 Command Syntax Error 201 Value Out of Range Error 220 Parameter Missing Error 504 Switch Mechanism has failed CHAPTER 12 Error Messages FOM 7900B FIBER OPTIC SYSTEM ERRORS 12 5 ILX Lightwave 70032603 Revision 00 page left blank intentionally 12 6 CHAPTER 12 Error Messages FOM 7900B FIBER OPTIC SYSTEM ERRORS ILX Lightwave 70032603 Revision 00 CHAPTER 13 TROUBLESHOOTING This chapter is intended to be used as a guide when the FOM 7900B mainframe or modules do not
137. onitored using the EVEnt query If any of the enabled bits in the Event Register are true bit 0 of the status register is set Refer to the status reporting diagram in FIGURE 8 11 The enable registers retain their values at power up unless the power on status clear flag is set true see PSC in CHAPTER 8 ENAB EVE 256 Modulation ON or OFF updates bit 0 of the Status Byte CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 Front Panel ENABle EVEnt Remote Y FOM 7900B FOS 79800E FOS 79710 DPM 79810 The ENABle EVEnt query returns the value of the FOM 7900B status event enable register gt PARAMETERS None SYNTAX DIAGRAM RESPONSE lt response data gt lt response terminator gt where the response data is the binary sum of the following 1 Not Used 256 Modulation ON OFF 2 Not Used 512 Sources ON OFF 4 Not Used 1024 Not Used 8 Not Used 2048 Not Used 16 Not Used 4096 Not Used 32 Not Used 8192 Not Used 64 Not Used 16384 Not Used 128 Not Used 32768 Not Used CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 21 ILX Lightwave 70032603 Revision 00 POINTS OF INTEREST EXAMPLES SYNTAX DIAGRAM PARAMETERS RESPONSE The event enable register can be set by using the ENABle EVEnt command The condition status can be monitored by the EVEnt
138. ors pins on both ends and must have one twist between pins 2 and 3 Refer to Table 7 2 This cable is connected between the RS 232 A connectors on both units CHAPTER 7 RS 232 Interface 7 1 ILX Lightwave 70032603 Revision 00 7 2 Additional FOM 7900B mainframes are linked using a cable that has a female connector on one end and a male connector on the other end This cable should have no twists between pins 2 and 3 in other words it must be wired straight through The female end of this cable is inserted into the RS 232 B connector of the upstream FOM 7900B and the male end into the RS 232 A connector of the downstream FOM 7900B Refer to Table 7 2 for more details Table 7 2 RS 232 Connector wiring WIRING DIAGRAM Connector 1 Connector 2 1 1 7 ETE 3 2 4 4 5 6 6 T 7 B 8 9 9 NOTE unique Bank Address must be assigned to each FOM 7900B in the chain The unit connected to the GPIB interface must be assigned a bank address of 0 FIGURE 7 1 shows the addressing scheme for all FOM 7900B modules FIGURE 7 1 FOM 7900B Stacked System CHAPTER 7 RS 232 Interface Linking Multiple FOM 7900B Systems ILX Lightwave 70032603 Revision 00 USING G
139. ow key to select an absolute or differential measurement The available selections are ABSOLUTE RELATIVE 1 2 and RELATIVE 2 1 Press the ENTER key to accept the selection ABSOLUTE each power meter operates independently displaying their respective power measurement RELATIVE 1 2 the two power meters operate together displaying the difference in power OPM1 OPM2 RELATIVE 2 1 the two power meters operate together displaying the difference in power OPM2 OPM1 Display Power 5 10 Press the PARAM key from the MAIN level menu to display power readings Press the ENTER key to toggle between Power1 and Power2 displays This display is dependent on the current mode of operation When the mode of operation is ABSOLUTE two displays will be available one displaying the absolute power reading from the first optical power meter and the second displaying the absolute power reading from the second optical power meter This menu is intended for informational purposes and contains no changeable fields CH 1 POWER1 1 POWER2 3 333 WATTS 1 384 NW CH 1 Relative 1 2 CH 1 Relative 2 1 2 0 DB 0 4 DB CHAPTER 5 DPM 79810 MODULE DPM 79810 Dual Power Meter Module Parameter Menu ILX Lightwave 70032603 Revision 00 OPERATING PARAMETERS SETUP 1 SETUP OPM1 Use this menu to modify operating parameters for the optical power meters individually or simultaneously Select SETUP using the PARAM key from the
140. ower and stored reference optical power CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 45 ILX Lightwave 70032603 Revision 00 SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST 9 46 An lt nrf value gt 1 on enabled 0 off disabled The reference value is stored when power is turned off Please note when operating in this mode the reported measurement will be a difference in power if this mode is being used and the user is not aware of the fact the readings will appear to be erroneous BOTH REF 1 Sets both optical power meters to report the subsequent measurements as a difference in optical power from the current optical power OPM1 REF 0 Disables the first optical power meter from measuring the optical power as a difference from the reference optical power X Front Panel REFerence X Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The BOTH REFerence and OPM1 REFerence queries return the current state of the optical reference None The response is an lt nrf value 1 on enabled 0 off disabled Care must exercised in knowing when the reference command is enabled Making measurements in reference mode and not expecting referenced results will lead to erroneous measurements CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference EXAMPLES SYNTAX DIAGRAM PARAMETERS
141. pletion 8 25 Input Buffer and Output Data 8 26 Remote Interface Messages 8 26 Interface Function Subsets 8 27 Remote Messages 1 1 8 27 Remote Interface Messages Not Supported by 7900 8 27 CHAPTER9 COMMAND REFERENCE Terminology 9 1 Commands and Queries 1 9 2 Substitute Parameter Names 9 2 Compound Command Structure 2 9 2 Common Commands aaee i e a a a ener 9 2 Device Specific Commands sse 9 5 FOM 7900B Mainframe and Module Command Reference 9 9 xiv CHAPTER 10 PROGRAMMING EXAMPLES CHAPTER 11 MAINTENANCE Fuse Replacement 2 2 2 2 Line Voltage Selection _ Module replacement FOS 79800E and FOS 79710 Module Maintenance Cleaning Fiber Optic Connectors User Calibration of the FOS 79800E Module Wavelength Calibration Power Calibration CHAPTER 12 ERROR MESSAGES FOM 7900B FIBER OPTIC SYSTEM ERRORS CHAPTER 13 TROUBLESHOOTING
142. plied is made with respect to the documentation or to the software described in this document with regard to their quality performance merchantability or fitness for any particular purpose CALIBRATION AND REPAIR ILX Lightwave offers complete calibration and repair service across our entire line of products ILX Factory Authorized Service Centers are located at several locations around the globe in order to facilitate your service requirements Quick service turn times an easy fixed price repair and calibration service schedule along with knowledgeable and professional staff all combine to ease instrument maintenance and repair ILX Lightwave provides in house and on site calibration services for ILX instruments Most ILX instruments require yearly calibration to insure performance to published specifications ILX factory calibrations employ NIST traceable measurement instrumentation Our Calibration Engineers and Technicians use automated test equipment to accurately and efficiently capture and record calibration data of the ILX equipment A detailed report showing any pre calibration out of tolerance conditions are available upon request An original certificate of calibration authenticity is provided on all instrument calibrations On site calibrations can be performed whenever your production schedule allows night or day seven days a week Please call an ILX Customer Service or Sales Engineer at 800 459 9459 to discuss how we can help
143. productivity or reduced cost of ownership PRODUCT OVERVIEW The FOM 7900B Fiber Optic System supports up to eight modules of stabilized DFB or Fabry Perot laser sources fiber optic switches or dual power meters All are controlled from a single user interface The mainframe and modules can be controlled by a GPIB IEEE 488 2 or RS 232 interface Up to twenty five FOM 7900B Systems can be linked to control up to 200 channels from one GPIB address AVAILABLE OPTIONS The following options are available with the FOM 7900B Fiber Optic System Table 1 1 Module Options DESCRIPTION MODEL NUMBER 1x4 Fiber Optic Switch Module FOS 79710 Precision Fiber Optic Source Module FOS 79800E Dual Power Meter DPM 79810 CHAPTER 1 INTRODUCTION 1 1 ILX Lightwave 70032603 Revision 00 SUMMARY OF INSTRUCTION MANUAL Thank you for purchasing an ILX Lightwave FOM 7900B Fiber Optic System This manual describes the maintenance and operation of the FOM 7900B Fiber Optic System and modules We recommend that you read this manual before operating the FOM 7900B Fiber Optic System CHAPTER 2 System Overview Before using the FOM 7900B Fiber Optic System the user should become familiar with the physical components of the unit This chapter describes the exterior and interior components provides specifications for the FOM 7900B Fiber Optic System CHAPTER 3 FOM 7900B Mainframe Operation This chapter is a
144. r 1 or 0 SEQ TMR NONE Returns the state of the Timer Mode 1 or 0 SEQ TRG ON OFF Enables or Disables the External Trigger 1 or 0 SEQ TRG NONE Returns the state of the Trigger Mode 1 or 0 CHAPTER 6 FOS 79710 Module External Trigger Specifications CHAPTER 7 ILX Lightwave 70032603 Revision 00 RS 232 INTERFACE RS 232 COMMUNICATIONS PROTOCOL To establish serial communications between a computer serial port and the FOM 7900B System a serial cable is connected between an available COM port on the host computer and the RS 232 connector on the rear panel of the FOM 7900B This cable must be wired straight through and have a male connector on the FOM 7900B side The serial port on the computer is initialized to the parameters described in Table 7 1 Table 7 1 RS 232 Parameter Values PARAMETER VALUE Baud Rate 9600 Stop Bits 1 Parity None Data Bits 8 Flow Control None LINKING MULTIPLE FOM 7900B SYSTEMS It is possible to link up to twenty five FOM 7900B Systems to control up to 200 channels from one GPIB address or one RS 232 connection to a host computer If several FOM 7900B mainframes are being controlled from one GPIB address a GPIB cable is connected to the first FOM 7900B and the GPIB address is set for that unit Serial cables are used between subsequent FOM 7900B mainframes The cable between the first and second mainframes must have male connect
145. r details on the use of the commands Table 5 4 DPM 79810 Module Commands NAME PARAMETERS FUNCTION MODE 1 Sets the display mode to 1 absolute 2 relative OPM1 2 3 relative OPM2 1 Returns the current mode of operation 1 absolute 2 relative OPM1 OPM2 relative OPM2 OPM2 OPMn CALibration 1 Sets the user calibration BOTH CALibration constant valid values are 0 500 to 2 000 OPMn CALibration NONE Returns the user calibration BOTH CALibration constant 1 000 is the default OPMn FILTer 1 Sets the number of samples BOTH FILTer that are averaged to generate a measurement valid range is 1 to 50 OPMn FILTer NONE Returns the current number of samples that being averaged to generate a measurement 1 is the default OPMn POWer NONE Returns the current power measurement for optical power meter CHAPTER 5 DPM 79810 MODULE COMMAND REFERENCE ILX Lightwave 70032603 Revision 00 Table 5 4 DPM 79810 Module Commands NAME PARAMETERS FUNCTION OPMn RANGE 1 Sets the range value for the BOTH RANGE optical power measurement valid range is 0 8 Where 0 Auto Range 1 1W 2 100mW 10mW 4 1 5 100uW 6 10 pW 7 1uW 8 100nW OPMn RANGE NONE Returns the current setting for BOTH RANGE the range value 0 is the default OPMn REFerence 1 Sets th
146. rame using GPIB is described in CHAPTER 8 GPIB Remote Operation and Common Commands The terms frequently used in this chapter are repeated below white space refers to ASCII characters such as Space Bar which are used as separators in the command syntax nrf value refers to the IEEE 488 2 standard for numeric format notation It is a generic label which means either integer floating point or scientific notation number representation suffix refers to the IEEE 488 2 standard for suffixes Suffixes are not used CHAPTER 9 Command Reference 9 1 ILX Lightwave 70032603 Revision 00 COMMANDS AND QUERIES There are two types of device communication commands which tell the device to do something and do not return anything and queries which return a stored value or instrument state but do not change the device state Queries must be terminated with a question mark while commands may require one or more parameters COMMAND FREQ 100 00 Internal Modulation Frequency is set to 100 000 kHz QUERY FREQ Returns the Internal Modulation Frequency Substitute Parameter Names For clarity in programming the Boolean values of one and zero may be represented by the appropriate substitute parameter names Refer to Table 8 5 The commands MODULATION 1 MODULATION ON and MODULATION TRUE are identical Compound Command Structure Some FOM 7900B GPIB commands require a compound structure This is done to distinguish betwee
147. rameter Selection sss 3 2 Parameter 3 3 Parameter secet rede t nee e I ede nene 3 3 Sweeping Parameter Values e 3 3 Mainframe Parameter Menu 2 3 4 Modulation Setup tome BERE emen 3 4 Modulation 3 5 Modulation Source 000000 0 0 00 3 5 Return to Main 3 5 Modulation ON OFF cccccsccceceeeeseseseeseceeecececeeceeeseeeeeesesesuaaaaeaes 3 6 Coherence Control ON OFF 0022 0 0 000 0000 3 6 Sources ON OFF siete err pce ais 3 6 Setup Mode sel te lads ened 3 7 Set GBIB Address emet 3 7 Set Bank Address oe eiTe deen 3 7 Return to Main 3 7 Error Display eintreten AEE a ded 3 8 CHAPTER 4 FOS 79800E MODULE FOS 79800E Specifications 4 2 55 810 Source Shutter OPTION 4 4 FOS 79800E Source Module Parameter menu 4 5 Module Identification 4 5 Output cicer detras c de ee 4 6 Source Shutter OPEN SHUT sss 4 6 Set Power Level 4 6 ILX Lightwave 70032603 Revision 00 Set Wavelength 2 2 2 211 1 0 0 2 1 2 17 1 6 4 7 User Calibration a 4 7 Calibrate
148. relative measurements BOTH UNITS DBM 0 0 Indicates that both optical power meters are reporting their optical power measurements in Watts OPM1 UNITS DBM 1 The measurement reporting for the first optical power meter is in either dBm or dB units CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES SYNTAX DIAGRAM ILX Lightwave 70032603 Revision 00 X Front Panel WAVE Remote FOM 7900B x4 FOS 79800E FOS 79710 DPM 79810 The WAVE command sets the wavelength of the 79800E Precision Fiber Optic Source The nrf value is the desired wavelength setting in nanometers Use this command to set the wavelength of the source The source is enabled and disabled using the OUT command WAVE 1553 67 The wavelength is set to 1553 67 nm X Front Panel WAVE X Remote FOM 7900B Y FOS 79800E FOS 79710 DPM 79810 The WAVE query returns the source s wavelength setting nanometers POPC CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 67 ILX Lightwave 70032603 Revision 00 RESPONSE POINTS OF INTEREST EXAMPLES SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST lt response data gt lt response terminator gt where the lt response data gt represents the wavelength in nanometers This command returns the present wavelength setting in nanometers The wavelength is set
149. ress the ENTER key 3 Press PARAM repeatedly until GPIB Address is displayed Use the UP and DOWN arrow keys to select the desired GPIB address then press the ENTER key The allowable range is 1 through 31 ANSI IEEE 488 2 DEFINITIONS The following sections contain the relevant definitions for syntax diagrams and syntax elements for the GPIB commands as defined by the IEEE 488 2 standard Syntax Diagrams Syntax diagrams indicate the most complete form of GPIB command construction The terminology shown here and in subsequent sections is used throughout this manual to define the command syntax These syntax diagrams conform to the ANSI IEEE 488 2 1987 standard and the terminology presented here reflects that standard The oval or round shape contains a terminal syntactic element These represent a basic function such as a single ASCII character which cannot be divided Rectangles contain non terminal syntactic elements These represent elements which are expandable to a diagram of terminal syntactic elements However they are presented as a unit for clarity or emphasis Lines and arrows indicate correct paths through the syntax diagram A reverse line around an element indicates that the element may be repeated indefinitely A forward arrow around an element indicates that the element is optional CHAPTER 8 GPIB Remote Operation and Common Commands ANSI IEEE 488 2 Definitions 8 3 ILX Lightwave 70032603 Revision 00
150. ruments NI 488 2 GPIB card The first is an example of a driver for GPIB communications with the FOM 7900B The second is an example of an output power and wavelength display calibration These examples are not complete and will not execute by themselves The initialization of some variables and files have been purposely omitted Table 10 1 GPIB Driver 10 SUB 7900dvr Device id Command ResponseS Err 20 This driver provides bus time out protection and looks for device dependent errors 30 40 ON ERROR GOTO handler Watch for software errors 50 CALL Ibtmo Device id 10 Provide 300 mSec time out on GPIB 60 70 Cmd_len LEN Command Get length of command string 80 IF Cmd_len gt 0 THEN 90 CALL Ibwrt Device id Command Send the command 100 END IF 110 IF INSTR Command THEN s the command a query 120 CALL Ibrd Device id Response Get the response 130 END IF 140 150 CALL Ibwrt Device id STB Get the Status Byte 160 CALL Ibrd Device id Status byte 6 170 Err_bit Status byte96 AND 128 Is the error queue active bit set 180 IF Err bito gt 0 THEN 190 CALL Ibwrt Device id ERR Get the Error queue 200 CALL Ibrd Device id Err Report the Errors CHAPTER 10 Programming Examples 10 1 ILX Lightwave 70032603 Revision 00 Table 10 1 GPIB Driver 210 PRINT ERROR IN 7900B COMMUNICATIONS DEVICE DEPENDENT ERROR 220 PRINT ERRORS ARE Err
151. s Event Status Enable register ESE Queries Event Status Enable register ESR Queries Event Status Register IDN Identification Query OPC Sets Operation Complete bit OPC Queries Operation Complete PSC Clears registers at power up PSC Queries Power on Status Clear flag PUD Protected User Data PUD Retrieves Protected User Data RST Resets the instrument SRE Sets Service Request Enable register SRE Queries the Service Request Enable register STB Queries Status Byte TRG Trigger all modules WAI Wait for No Operation Pending Flag CHAPTER 8 GPIB Remote Operation and Common Commands Common Commands and Queries 8 13 ILX Lightwave 70032603 Revision 00 SYNTAX SYNTAX CLS Sending the CLEAR STATUS command resets the Standard Event Register 5 Status Byte STB and Error Queue ERR to zero This command may be used to clear the status registers before enabling SRQ generation from instrument events LOO ESE The STANDARD EVENT STATUS ENABLE command is used to load the Standard Event Status Enable Register The Standard Event Status Enable Register is logically ANDed to the Standard Event Register refer to FIGURE 8 9 If the result is non zero then the Event Summary Bit bit 5 in the Status Byte is set to one The ESE command is useful for assigning which events are capable of generating an SRQ where the integer nrf gt is the binary integer sum of the enabled bit
152. s important for commands such as MOD ON OFF and FREQ CHAN x9 commands e g CHAN 9 19 29 249 are module specific and will apply to all modules in the mainframe If CHAN x9 is selected then subsequent commands are forwarded to all the modules in the selected mainframe The command sequence CHAN 49 LEVEL 3 00 is useful to set the power level for all eight sources in the fifth mainframe to 3 00 dBm The following rules must be followed when sending commands and queries to a stacked FOM 7900B System these rules apply to a system connected to the host computer with either a GPIB cable or an RS232 cable The CHANNEL command should always be sent as the only command on the command line and it must be followed by an OPC operation complete query No other command or query should appear on the command line Incorrect command line CHANNEL 25 LEVEL 5 0 WAVE 1550 0 OPC Correct command lines CHANNEL 25 OPC LEVEL 5 0 WAVE 1550 0 OPC Any command line sent should be terminated by an OPC query if it does not already contain a query Incorrect command lines MOD ON LEVEL 5 00 Correct command lines MOD ON OPC LEVEL 5 00 OPC LEVEL 5 00 LEVEL Commands and or queries to different banks must not be mixed on the same command line CHAPTER 7 RS 232 Interface Communication with multiple FOM 7900B systems ILX Lightwave 70032603 Revision 00 EXAMPLE Incorrect command lines CHAN 12 LEVEL 5
153. s in FIGURE 8 9 The value must be between 0 and 255 8 14 CHAPTER 8 GPIB Remote Operation and Common Commands Common Commands and Queries ILX Lightwave 70032603 Revision 00 ESE The STANDARD EVENT ENABLE REGISTER QUERY allows the user to determine which status bits can set the summary bit bit 5 in the Status Byte The response is the sum of the enabled bits presented in FIGURE 8 9 TOPO RESPONSE Binary Integer Sum of enabled bits in FIGURE 8 9 The value must be between 0 and 255 SYNTAX 7615 413 21110 Standard Event Status Register Logical OR 7615 4 131211101 Standard Event Status Enable Register Bit Reference 0 Operation Complete 4 Execution Error 1 N A 5 Command Error 2 Query Error 6 N A 3 Device Dependent Error 7 Power On FIGURE 8 9 Standard Event Status Status Enable Register CHAPTER 8 GPIB Remote Operation and Common Commands Common Commands and Queries 8 15 ILX Lightwave 70032603 Revision 00 SYNTAX RESPONSE SYNTAX RESPONSE ESR This query causes the device to return the value of the STANDARD EVENT REGISTER The value of the response is the binary integer sum of the bits presented in FIGURE 8 9 Binary Integer Sum between 0 255 FIGURE 8 9 IDN This query causes the FOM 7900B to return the MAINFRAME IDENTIFICATION string The string is 39 bytes long Lightwave 7900 System 7900
154. serCal using the PARAM key from the SETUP menu Use the UP or DOWN arrow key to select the user calibration factor Press the ENTER key The available range for the user calibration is 0 500 to 2 500 The most common application of user calibration is to calibrate the optical power meter to read correctly with an external attenuator For example if you attach a calibrated 3dB attenuator only 50 of the input signal gets to the meter In this situation set the user calibration factor to 2 000 and the meter will then display correctly Remember to consider the accuracy of the attenuator as well as the meter in attenuated measurements Save Setup Parameters CH 1 OPM1 SAVESETUP 1 This feature allows the user to save the current setup parameters in a specified bin location Select SaveSetup using the PARAM key from the SETUP menu Use the UP or DOWN arrow key or the numeric keypad to enter the bin number in which the current parameters are to be stored Press the ENTER key Request End Setup 5 14 CH 1 OPM1 ENDSETUP PRESS ENTER This returns the user to main level menu structure for the optical power meter Select EndSetup using the PARAM key from the SETUP menu Then press the ENTER key to return to the main level menu structure CHAPTER 5 DPM 79810 MODULE Operating Parameters Setup ILX Lightwave 70032603 Revision 00 WARNINGS CH 1 WARNINGS None Displays warning messages OPERATING IN REMOTE CONTROL
155. t data byte gt E 8 bit data byte gt non zero digit is a single ASCII encoded byte in the range 31 39 49 57 decimal 8 bit data byte is an 8 bit byte the range 00 FF 0 255 decimal NL is a new line LF END is an end or identify EOI FIGURE 8 7 ARBITRARY BLOCK PROGRAM DATA PROGRAM DATA SEPARATORS gt When there is a list of PROGRAM DATA UNITS parameters following a PROGRAM HEADER SEPARATOR white space the PROGRAM DATA UNITS must be separated with a PROGRAM UNIT SEPARATOR gt FIGURE 8 8 shows a syntax diagram for a PROGRAM UNIT SEPARATOR gt FIGURE 8 8 PROGRAM DATA SEPARATOR gt 8 8 CHAPTER 8 GPIB Remote Operation and Common Commands ANSI IEEE 488 2 Definitions ILX Lightwave 70032603 Revision 00 Power on Conditions At power on the FOM 7900B complies with the ANSI IEEE Std 488 2 1987 requirements It initializes the device parameters to be the same as when the power was last shut down However the source outputs are always disabled at power up The default conditions may be recalled by using the RST command Default conditions are shown below Default Parameters There are no default values for omitted parameters If a command is expecting a parameter and none is entered an error is generated If a reset is performed with the RST command the instrument is configured as shown in Table 8 2 Table 8 2 FOM 7900B Default Settings
156. t clearance 204 lt PROGRAM DATA gt suffix type is not valid 205 PROGRAM DATA is not a Boolean value or word 206 PROGRAM DATA gt will not convert to a signed 16 bit value 207 PROGRAM DATA will not convert to an unsigned 16 bit value 208 PROGRAM DATA will not convert to a signed 32 bit value 209 PROGRAM will not convert to an unsigned 32 bit value 210 PROGRAM gt will not convert to a floating point value 211 PROGRAM DATA will not convert to a character value 212 PROGRAM gt will not convert to a byte array pointer 213 PROGRAM DATA is incorrect block data length 214 PROGRAM DATA length exceeds maximum 219 Present modular configuration doesn t match that of stored setting 220 Required parameter is missing from command CHAPTER 12 Error Messages FOM 7900B FIBER OPTIC SYSTEM ERRORS 12 3 ILX Lightwave 70032603 Revision 00 12 4 Table 12 4 GPIB Errors poy EXPLANATION 301 A RESPONSE MESSAGE was ready but controller failed to read it Query error 302 Device was addressed to talk but controller failed to read all of the RESPONSE MESSAGE gt Query error Table 12 5 Mainframe Specific Errors E EXPLANATION 401 Channel number out of range 0 to 9 legal 402 Bank address number out of range 0 to 24 legal 403 Internal modulation frequency out of range 1 to 500 kHz legal 404 C
157. te CH 1 OPM1 FILTERING 1 The filter setting refers to the number of digital samples that are averaged before a measurement is reported This has the advantage of integrating out the affects of noisy signals Select Filtering using the PARAM key from the SETUP menu Use the UP or DOWN arrow key to enter the filtering value Press the ENTER key The range of available filter settings is 1 to 50 samples with 1 offering a measurement every 150msec and 50 offering a measurement every 7 5 seconds Measurement Units 5 12 CH 1 OPM1 UNITS MW The optical power meter can display the measurements in either a linear scale Watts or a Logarithmic scale dBm When viewing relative measurements either OPM1 OPM2 or OPM2 OPM1 the setting for OPM1 will establish the units displayed Select Units using the PARAM key from the SETUP menu Use the UP or DOWN arrow key to cycle between the two available choices Press the ENTER key The available selection for measurement units is either Linear Watts or Logarithmic dBm CHAPTER 5 DPM 79810 MODULE Operating Parameters Setup ILX Lightwave 70032603 Revision 00 Reference Power Reading CH 1 OPM1 REFERENCE ON An additional feature of this module is the ability to store a reference power measurement for each of the two individual optical power meters When a reference reading is stored the displayed power value will be the difference between the reference power reading and th
158. tom left corner of the front panel CHAPTER 2 System Overview Module Installation 2 7 ILX Lightwave 70032603 Revision 00 POWER UP Connect the FOM 7900B mainframe to an AC power source Press the POWER switch to supply power to the device and start the six second startup sequence WARNING To avoid electrical shock hazard connect the FOM 7900B System to a properly 2 8 earth grounded three prong receptacle only Failure to observe this precaution can result in severe injury or death Warm up and Environmental Considerations To achieve rated stability the mainframe with modules installed must warm up for a minimum of one hour with the power on Some modules may require a longer warm up time The operating conditions are determined by the type of module installed but must not exceed 0 40 C and 9096 non condensing relative humidity CAUTION DANGER VISIBLE AND OR INVISIBLE LASER RADIATION AVOID DIRECT EXPOSURE TO THE BEAM GEFAR SEHBAR UND ODER UNSICHTBAR LASER STRAHLUNG MEIDE RICHTE AUFDECKUNG ANS STRAHL DANGER VISIBLE ET OU INVISIBLE LASER RADIATION EVITENT DIRECT EXPOSURE AU POUTRE PERICOLO VISIBLE E O INVISIBLE LASER RADIAZIONE EVITANO DIRETTA EXPOSURE AGLT TRAVE The high brightness sometimes invisible light output of laser diodes and other laser sources poses a definite eye hazard Direct viewing of the laser output can produce retinal or corn
159. tor bulkhead Carefully replace the bulkhead connector to the module front panel and secure it with the two 2 sockethead cap screws that were removed in step three Repeat steps three through six above for all of the fiber connectors to the module front panel CHAPTER 11 Maintenance FOS 79800E and FOS 79710 Module Maintenance ILX Lightwave 70032603 Revision 00 USER CALIBRATION OF THE FOS 79800E MODULE User Calibration s can be utilized when the measured output power and or wavelength do not match front panel settings Use the procedures below to field calibrate the power and wavelength Wavelength Calibration The Wavelength User Calibration can be used when the measured wavelength does not match the front panel setting Use the steps below to enter a Wavelength User Calibration This calibration generates a single point offset that is applied to all future wavelength settings 1 Connect an optical wavelength meter to the end of a fiber optic patch cord that is also connected to the 79800E Precision Fiber Optic Source Setup the meter for a measurement in a vacuum Set the 79800E Precision Fiber Optic Source Module to a wavelength near that of the test application Turn the source on Proceed to the Cal Wavelength display Give the system enough time to warm up and stabilize at least one hour Measure the wavelength with the wavemeter Enter this measurement as the Cal Wavelength value Power Calibration The Pow
160. up into the SETUP level menus cycle through the parameter menus to the END SETUP and press the ENTER key The DPM 79810 Dual Power Meter Module menu is shown in Table 5 3 A selection is made by repeatedly pressing the PARAM key until the desired parameter is displayed Table 5 3 DPM 79810 Parameter Menu Zero Meter OPM1 OPM2 BOTH MODE Absolute Relative 1 2 Relative 2 1 Power1 Power2 or Relative 1 1 2 or Relative 2 1 SETUP OPM1 2 or BOTH OPM1 Recall CHAPTER 5 DPM 79810 MODULE DPM 79810 Dual Power Meter Module Parameter Menu 5 7 ILX Lightwave 70032603 Revision 00 Table 5 3 DPM 79810 Parameter Menu 1 10 OPM1 Wavingth OPM1 Filtering 1 50 default 1 OPM1 Units mW dBm OPM1 Range RANGE AUTO 1 Watt 100mW 10mW 1mW 100 UW 10uW 100nW OPM1 User Cal 0 5 2 500 OPM1 Reference ON OFF OPM1 SaveSetup 1 10 OPM1 End Setup PRESS ENTER WARNINGS 5 8 CHAPTER 5 DPM 79810 MODULE DPM 79810 Dual Power Meter Module Parameter Menu Module Identification CH 1 DPM 79810 SN 810XXXX VER X X ILX Lightwave 70032603 Revision 00 The first menu contains the module type module serial number and firmware version The parameter is not adjustable The arrow keys and ENTER are disabled Request Zero Operation CH 1 ZERO METER OPM1 This feature applies an offset correction factor to the internal amplifiers that eli
161. velength near that of the test application Turn the source on 3 Proceed to the Cal Wavelength display 4 Give the system 1 hour to warm up and stabilize Measure the wavelength with the wavelength meter Then use the LEFT and RIGHT arrow keys to move the cursor and the UP and DOWN arrow keys to enter the measured wavelength from the meter Then press the ENTER key Reset User Calibration CH 1 DEFAULT CAL PRESS ENTER Press ENTER at this display to remove the effects of the User Calibration s The User Calibration is an offset that is applied to all power and wavelength settings Resetting the calibration returns these offsets to 0 00dB and 0 000nm Return to Main Menu CH 1 USER MODE PRESS ENTER Press the ENTER key to return to the main menu structure 4 8 CHAPTER 4 FOS 79800E Module FOS 79800E Source Module Parameter menu ILX Lightwave 70032603 Revision 00 Error Display CH 1 ERROR 501 CASE TEMP ERROR This parameter is displayed only when an error condition has been detected within the module The parameter cannot be modified and the arrow keys and the ENTER key are disabled Error messages are defined in CHAPTER 12 of this manual EXTERNAL TRIGGER The FOS 79800E Fiber Optic Source Module does not support external triggering ERROR INDICATOR ON INDICATOR MODULATION When an error is detected within the FOS 79800E Module the red LED on the front of the module blinks To vie
162. vidual chapter on modules for details regarding how the trigger affects each module TRIG Triggers all compatible modules in a FOM 7900B mainframe X Front Panel UNITS DBM X Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The BOTH UNITS DBM and OPM1 UNITS DBM commands enable or disable the reporting of optical power measurements in dB or dBm An nrf value 1 on enabled 0 off disabled CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference 9 65 ILX Lightwave 70032603 Revision 00 POINTS OF INTEREST EXAMPLES SYNTAX DIAGRAM PARAMETERS POINTS OF INTEREST EXAMPLES 9 66 When the dBm units are disabled the optical measurements are reported in their default unit of Watts BOTH UNITS DBM 1 Sets both optical power meters to report the subsequent measurements in dBm or dB units OPM1 UNITS DBM 0 Disables the first optical power meter from reporting measurements in dBm units subsequent measurements are report in Watt units X Front Panel UNITS DBM X Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The BOTH UNITS DBM and OPM1 UNITS DBM queries return the current units used for reporting power None The response is an lt nrf value 1 on enabled 0 off disabled When the dBm units are not active the optical power measurements are reported in Watts When dBm units is active the units are either reported in dBm for absolute measurements and dB for
163. w a description of the error press the PARAM key repeatedly until the ERROR screen is displayed Error messages are displayed until the error causing condition is remedied Error messages are also described in CHAPTER 12 Error Messages When light is present at the output connector the green LED is on This indicates that both the Laser is energized and the Source Shutter option is open The default condition for the modules is laser not energized and shutter open This configuration has been adopted to maintain consistency between modules with and without the source shutter option It is possible to modulate the laser output of the FOS 79800E Control of the modulation is provided in the Ch All menu structure Refer to CHAPTER 3 FOM 7900B Mainframe Operation for more detail Modulation applies to all source modules simultaneously CHAPTER 4 FOS 79800E Module External Trigger 4 9 ILX Lightwave 70032603 Revision 00 COHERENCE CONTROL 4 10 In single mode fiber applications light from narrow linewidth sources will remain coherent even after travelling long distances This coherence can cause interference between reflective surfaces such as FC PC interfaces downstream from the optical source This interference is most noticeably seen as power instability The coherence control feature of the FOS 79800E broadens the linewidth of the laser thus decreasing the coherence length and minimizing the associated interference effects The cohere
164. with the WAVE command WAVE 1550 406 the wavelength is set to 1550 406 nm Front Panel WAVElength Remote FOM 7900B FOS 79800E FOS 79710 Y DPM 79810 The BOTH WAVElength and OPM1 WAVElength commands set the wavelength of the optical power that is being measured An nrf value Changes in the detector response are significant enough that the optical power meter must know the wavelength of the source signal in order to properly display the optical power The default unit of nanometers is assumed when entering this value The operating range for this optical power meter is 850 000nm to 1700 000nm 9 68 CHAPTER 9 Command Reference FOM 7900B Mainframe and Module Command Reference ILX Lightwave 70032603 Revision 00 EXAMPLES BOTH WAVE 1550 000 Sets both optical power meters to calculate the optical power based on the responsivity of the detector at 1550 000nm OPM1 WAVE 1480 000 Sets the first optical power meter to calculate the optical power based on the responsivity of the detector at 1480 000nm Front Panel WAVElength X Remote FOM 7900B FOS 79800E FOS 79710 DPM 79810 The BOTH WAVElength and OPM1 WAVElength queries return the current wavelength the power meter is using to calculate the optical power measurement SYNTAX DIAGRAM PARAMETERS None The response is an nrf value POINTS OF INTEREST Changes in the detector response are significant enough that the optical power meter must know the
165. x and packing material have been designed specifically for each product and should be saved for possible transportation at a later date ILX Lightwave 70032603 Revision 00 WARRANTY Limitation Returning an Instrument ILX Lightwave 70032603 Revision 00 ILX LIGHTWAVE CORPORATION warrants this instrument to be free from defects in material and workmanship for a period of one year from date of shipment During the warranty period we will repair or replace the unit at our option without charge This warranty does not apply to shipping damage fuses lamps defects caused by abuse modifications or to use of the product for which it was not intended This warranty is in lieu of all other warranties expressed or implied including any implied warranty of merchantability or fitness for any particular purpose ILX Lightwave Corporation shall not be liable for any incidental special or consequential damages If a problem occurs please notify ILX Lightwave Corporation and thoroughly describe the nature of the problem and give the serial number If an instrument is to be shipped to ILX Lightwave for repair or service be sure to 1 Obtain a Return Authorization RA number from the factory 2 Attach a tag to the instrument identifying the owner and indicating the required service or repair Include the instrument serial number the model number followed by a sequenced four digit number on the rear or side panel
166. y response until the preceding command has been completed PREPARATION FOR GPIB CONTROL To use the FOM 7900B remotely an IEEE 488 interface adapter is required in the host computer These adapters and support software are available from several manufacturers and can be installed in most computers LOCAL Control When the instrument is in REMOTE all front panel controls are disabled except the LOCAL key and the display indicates gt gt REMOTE lt lt Press the LOCAL key to return the device to LOCAL control re enabling the front panel When the unit is in LOCAL mode pressing the LOCAL key causes the GPIB address to be shown on the display for three seconds e g 01 REMOTE Control Whenever the instrument is addressed by a system controller the display indicates gt gt REMOTE lt lt and the front panel is disabled from manual control Press the LOCAL key to return to manual control 8 2 CHAPTER 8 GPIB Remote Operation and Common Commands 7900 and GPIB Controller Synchronization GPIB Address ILX Lightwave 70032603 Revision 00 The talk and listen addresses on the FOM 7900B are identical When the unit is in LOCAL mode pressing the LOCAL key causes the GPIB address to be displayed Extended GPIB addressing is not implemented in the FOM 7900B Use the following procedure to change the GPIB address 1 Press the CHAN UP or CHAN DOWN key until Ch All is displayed 2 Press PARAM repeatedly until Setup Mode is displayed P

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