2101 & 2103 User Manual RevC
Contents
1. 0 01 02 03 Time ms Time ms Models 2101 8 2103 Operation 9 Figure 4 Typical noise of the Model 2103 versus signal level 10 Operation Noise Levels The electrical noise voltage present at the output divided by the gain 50 mV dB of the power sensor represents the noise referred to the input A plot of this is shown in Figure 4 for the 25 kHz filter setting Note the discontinuity at the crossover rms noise level dB NEW FOCUS Inc Multi Channel Testing Ganging Multiple Units Multiple units can be bolted together to help maintain an orderly benchtop or to mount in a rack Screws for this are located in storage holes in the bottom of the unit these screws fit in the mating tabs see Figure 5 When bolted together the short power cables provided with each unit are used to daisy chain the power connections so a single supply can power multiple units The New Focus Model 0901 15 V Power Supply can power a total of nine units four from each of the two 300 mA outputs and one from the 100 mA output Figure 5 Mating Tab Ganging of Model 2103 front view Daisy chained power cables not shown __ Mating screws stored on bottom of each unit Models 2101 amp 2103 Operation 11 12 Operation NEW FOCUS Inc Characteristics Physical Specifications Figure 6 Front side and back views of the Model 2101 Figure 7 Front side and back views of the Model2. 0 20 0 40 0 60 0 80 1 00 1 20 Wavelength um 0 7 0 9 11 13 15 17 19 Wavelength um Models 2101 amp 2103 Operation 7 Be Operation Calibration Data Model 2103 Only To correct for wavelength response of the photodiode calibration information is provided on a sheet of paper found in the back of the manual These are the offsets in volts which must be subtracted from measured values in order for a 0 dBm input to produce 0 V at the output Input optical power is then given by P dBm 20 x Vineas Veal Warm up Time Active temperature stabilization of the photodiode and critical circuit components requires a warm up time of about five minutes for full accuracy Within this period the status light for Model 2103 changes from red to green and the output varies by several dB as the temperature stabilizes Failure of the status light to turn green indicates the ambient temperature is outside the operating range and Model 2103 may not give accurate readings Model 2101 has no status light Output Signal The output of the Models 2101 and 2103 is an analog voltage with a gain of 50 mV per dB of input light For Model 2101 a 3 5 V output corresponds to approximately 2 dBm of input power at 920 nm the accuracy degrades for signals outside the specified range of 0 4 V to 3 7 V 60 dBm to 6 dBm For the Model 2103 a 3 5 V output corresponds to approximately 0 dBm of input power at 1550 nm While the output ra
3. 2103 Output BNC 175 lt 3 89 98 9 e 44 5 gt EE crs ome O D 3 00 e A ex e Switch 1 50 b E 38 1 3 Pin Female 2 86 72 7 gt Connector Models 2101 amp 2103 1 040 32 Thread for FC Adapter 1281 Unless otherwise noted dimensions are in inches with metric dimensions in mm in parentheses 3 Pin Female Connector C ka 3 89 98 9 3 25 82 5 gt FC Connector P ra 2 86 72 7 Unless otherwise noted dimensions are in inches with metric dimensions in mm in parentheses Characteristics 13 Figure 8 Single unit configuration Characteristics Specification Model 2101 Model 2103 Calibrated Wavelength Range n a 1520 1620 nm Uncalibrated Wavelength Range 320 1060 nm 950 1650 nm Photodiode Material Si InGaAs Photodiode Diameter 5mm 1 mm Photodiode Window Fusion bonded AR coating borosilicate glass optimized at no AR coating 1550 nm Bandwidth Settings 3 dB 1 5 25 kHz 1 5 25 kHz Transition Time 0 100 25 kHz setting 30 us 30 us Maximum Power 6 dBm 4 dBm 920 nm typical rms Noise Floor 69 dBm 71 dBm 920 nm typical Calibrated Accuracy 0 dBm 22 C n a 0 1 dB Relative Accuracy 61 to 4 dBm 0 05 dB 63 pW 0 05 dB 40 pW 920 nm typical Optical Return Loss Single Mode APC n a 50 dB Polariz
4. USER S GUIDE High Dynamic Range Power Sensors Models 2101 amp 2103 NEW FOCUS 2584 Junction Ave e San Jose CA 95134 1902 USA phone 408 919 1500 e mail contact newfocus com e www newfocus com Warranty New Focus Inc guarantees its products to be free of defects for one year from the date of shipment This is in lieu of all other guarantees expressed or implied and does not cover incidental or consequential loss Information in this document is subject to change without notice Copyright 2003 2002 2001 1998 New Focus Inc All rights reserved The A NEW FOCUS logo and NEW FOCUS Inc are registered trademarks of NEW FOCUS Inc Document Number 210018 Rev C Contents Operation 5 et ee 5 Basic Operating Information 6 Details of Operation 2 0 A Ni O i 6 Characteristics 13 Physical Specifications pp 13 Et e ee 14 Customer Service 17 Technical Support pp 17 SEMMICE EE 17 Models 2101 amp 2103 Contents 3 Ae Contents NEW FOCUS Inc Operation Introduction Models 2101 and 2103 High Dynamic Range Power Sensors are sensitive optical receivers with logarithmic conversion circuitry to provide an analog output spanning a range of more than 70 dB of optical input power Designed for use in swept wavelength optical loss measurement the fast rise and fall times allow measurements at speeds of 100 nm s and beyond For Model 2103 the provided calibration data enables accurate absolute power m
5. We typically respond to faxes and email within one business day Service In the event that the power sensor malfunctions or becomes damaged please contact New Focus for a return authorization number and instructions on shipping the unit back for evaluation and repair Models 2101 amp 2103 Customer Service 17 18 Customer Service NEW FOCUS Inc
6. ation Dependence FC PO n a 0 02 dB Repeatability n a 0 01 dB Crossover Level 29 dBm typical 31 dBm typical Crossover Transient 0 001 dBems 0 001 dBems 14 Characteristics NEW FOCUS Inc Specification Model 2101 Model 2103 Crossover Discontinuity 0 03 dB 0 03 dB Temperature Drift 0 005 dB C typical 0 005 dB C typical Output Type Analog Analog Output Impedance lt 1 Q typical lt 1 Q typical Output Reference Level 23 2 dBm 3 5V 0 dBm 3 5 0 005 V 920 nm typical Output Slope 0 5 V decade 0 5 V decade Output Range 0 2 to 3 75 V typ 0 2 to 3 75 V typ Input Connector Free space plus fiber FC PC or FC APC adapter option Power Consumption 15V 75 mA 15V 75 mA Operating Temperature Range 15 357 C 15 357 C Taken at 1550 nm Models 2101 amp 2103 Characteristics 15 16 Characteristics NEW FOCUS Inc Customer Service Technical Support Information and advice about the operation of any New Focus product is available from our applications engineers For quickest response ask for Technical Support and know the model and serial numbers for your product Hours 8 00 5 00 PST Monday through Friday excluding holidays Toll Free 1 866 NUFOCUS 1 866 683 6287 from the USA amp Canada only Phone 408 919 1500 Support is also available by fax and email Fax 408 980 8883 Email techsupport newfocus com
7. easurement over the wave length range from 1520 nm to 1620 nm Outside of the calibrated band both the Model 2101 and Model 2103 work well as relative power sensors The logarithmic output provides a conversion gain of 50 mV dB of optical power so the full range of the sen sor can be converted to a digital signal with better than 0 01 dB resolution using a single 14 bit 5 V conversion This simplifies data collection eliminating the need for user controlled gain switch ing and multiple laser sweeps As a result data can be taken more quickly and without the added accuracy concerns that result from stitching errors between multiple sweeps The fast analog response is also useful for viewing high range signals on an oscilloscope making the Model 2101 and 2103 good tools for general lab use Multiple units can be bolted together and their power Models 2101 8 2103 Operation 5 cables daisy chained for testing of multi channel devices and rack mounting Basic Operating Information 1 Multiple units may be bolted together using screws found in threaded storage holes in the bottom of the unit Power connections can be daisy chained from one unit to the next using the short cables provided The Model 2101 accepts free space light input FC PC and FC APC fiber inputs are available with the Model 1281 fiber adapter accessory The Model 2103 accepts both FC PC and FC APC input connectors A 15 V 75 mA power supply is requ
8. ired In daisy chained applications with N power sensors the power supply should be rated for N times 75 mA The output is an analog voltage with a gain of 50 mV dB of input light For the Model 2101 a 3 5 V output typically corresponds to approximately 2 dBm of input optical power at 920 nm A 3 5 V output corresponds to approximately 0 dBm of input power at 1550 nm for the Model 2103 For the Model 2103 calibration information for precise measurements in the 1520 nm to 1620 nm range are provided on a sheet of paper found in the back of the manual Details of Operation Ge Operation Optical Input The Model 2101 accepts both free space and FC fiber input A 5 mm diameter photodiode makes the free space light easy to align NEW FOCUS Inc Figure 1 Wavelength response of Model 2101 vs wavelength Figure 2 Wavelength response of Model 2103 vs wavelength The Model 2103 accepts both FC PC and FC APC input connectors The fiber illuminates a 1 mm photodiode at sufficiently close range so that all the light is detected from both fiber types The fiber is perpendic ular to the diode so that the non angle polished input fibers result in the specified polarization dependence of lt 0 02 dB The typical wavelength dependence of the response is shown in Figure 1 for Model 2101 and Figure 2 for Model 2103 respectively The vertical axis is in optical dB and the horizontal axis is in optical wavelength um
9. nge is about 0 2 V to 3 75 V 74 dBm to 5 dBm accuracy degrades for signals outside the specified range of 0 4 V to 3 7 V 62 dBm to 4 dBm The unit must be connected to a high impedance load it cannot drive a 50 ohm load NEW FOCUS Inc Measurement Speed The Models 2101 and 2103 have three filter settings 1 5 and 25 kHz to reduce noise when speed of response is not critical The fastest setting results in a 0 100 small signal rise time of 30 ps and an analog bandwidth in excess of 25 kHz At this speed the Models 2101 and 2103 can be used to measure narrow optical filters at wavelength sweep speeds of 100 nm s To determine whether a slower filter setting can be used for swept wavelength measurements compare a measurement of the device under test at a faster sweep speed to one at a slower sweep speed e g four times slower If the faster measurement does not distort the result the filter can be used Cross over Detail The Models 2101 and 2103 employ fast switching to achieve essentially seamless range changing between two gain levels This feature results in slight discontinuities of both signal and noise at the crossover point near the output level of 29 dBm for Model 2101 and 1 95 V 31 dBm for Model 2103 Figure 3 shows an example of the crossover This will be insignificant for most applications but should be kept in mind Figure 3 Close up detail of crossover point for a sine wave input amp
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