OTPN-3850_Manual_REV.. - Olson Technology Inc.
Contents
1. SON E rcuno oay me Model OTPN 3850 SA 3 85GHz Wideband FTTH PON Receiver utput Ai Optical In 50 3 850MHz W From PON pa E Wideband PON Optical Receiver Model No OTPN 3850 SA Optical Out to ONU Instruction Manual Phone 209 586 1022 800 545 1022 FAX 209 586 1026 E Mail salessupport olsontech com 025 000641 REV X3 11 30 09 Page 1 Table of Contents INTRODUCTION spe ates Coed eRe EEE eee kr Neen een eee es 3 THEORY OF OPERATION ee cece eee see ee 3 BLOCK DIAGRAM sie s26on etek SE DER SEED Ee SR ar newness Meese aes 4 INSTALLATION ENVIRONMENTAL CONSIDERATIONS 0 3 OPTICAL CONNECTORS AND CLEANING ee ES Se SS SS ee ee ee 6 INTERNAL CONTROLS issas sks seed cues EE NE EE EE EER EER ER Gee EE tatakas 6 EXTERNAL INDICATORS AND CONNECTORS ee Ee Se Se se see 6 SETUPAND OPERATION rec osse SE ERGE ku OROS WERE DS RE DE GE RR Re Gie koe 7 ACCESSORIES AND SYSTEM APPLICATIONS SS Se ES se ee eee 8 025 000641 REV X3 Olson Technology Inc Page 2 INTRODUCTION The Olson Technology Inc Model OTPN 3850 SA provides 50 3 850 MHz bandwidth allow ing it to carry CATV signals from 50 870MHz along with two stacked 950 2 150MHz groups of L Band signals The L Band signals are at a level at least 10dB below the CATV signals The optical input contains downstream forward path CATV and L Band signals at 1550nm downstream Ethernet data at 1490nm and upstream Etherne2. not fully shown FIGURE 4 Typical System Application Using the OTPN 3850 025 000641 REV X3 Olson Technology Inc Page 8
3. IDERATIONS The OTPN 3850 receiver is specified to operate from 40 C to 65 C It usually does not require an air conditioned environment It should be mounted in an adequately ventilated area Like all electronic equipment it will generally have a longer life span if it is not operated at the extremes of the temperature range Installation in wet areas or areas of extremely high humidity should be avoided Extremely dirty or dusty areas should also be avoided if possible The OTPN 3850 may be installed and operated in any position on a flat surface The unit has four slots in the bottom plate to accommodate mounting hardware If mounting requires a wood screw use 4 pan head sheet metal screws These are commonly available at hardware stores If mounting with a machine screw to tapped holes use 4 40 pan head screws Figure 1 shows the dimensions of the bottom plate of the OTPN 3850 11 32 thru 4 places 4 040 3 620 125 dia and slot 4 places FIGURE 1 OTPN 3850 MOUNTING PLATE 025 000641 REV X3 Olson Technology Inc Page 5 OPTICAL CONNECTORS AND CLEANING The standard optical connectors on the OTPN 3850 are GREEN SC APC angle polished connectors The internal fiber ends can be damaged by the insertion of contaminated connectors Some types of customer damage to the connectors are not covered under the warranty Fiber connectors should never be left uncovered Prepackaged alcohol wipes are the most convenient means of
4. ORIES AND SYSTEM APPLICATIONS The OTPN 3850 makes up half of a typical FTTH PON system The other half is the transmit hardware Figure 4 shows a typical configuration of a complete FTTH PON system The two L Band signals are first stacked and then converted to light separately from the CATV signals The optical outputs of the CATV and L Band transmitters are combined by a DWDM Mux and then amplified by an EDFA The EDFA output is then split a large number of times and a portion of that signal input to numerous OTPN 3850 s The two optical signals from the two transmitters are added together at the photodiode and decoded as a single 50 3 850MHz RF signal The L Band DeStacker then separates the two original 950 2 150MHz L Band signals Typically the CATV signal is on the same DeStacker output as the L Band 1 signal CATV Tx CATV Signals e g OTOT 1000 FF or TROMME OTOT 1000 HH DWDM en 34 2 Channel DWDM Mux L Band 1 e g OT DWDM 2 950 2 150MHz L Band Stacker a EE L Band 2 e g Global DWDM Ch 38 950 2 150MHz EDFA f e g OTEB CO Optical or OTEA CM Optical Splitter e g OTCP 1x16 gt gt gt re O gt 2 a E Er aq E gt TE Zh _ ma CATV L Band 1 D O 9 gt 50 2 150MHz L Band DeStacker gt e g Global L Band 2 950 2 150MHz pics Ethernet Eguipment Note For simplicity the hardware associated with the Ethernet Signals usually associated with this type of system are
5. cleaning optical connectors Clean alcohol and lint free wipes or swabs may also be used INTERNAL CONTROLS There are no internal user adjustments There is no reason to open the unit Any attempt to do so will void the manufacturer s warranty EXTERNAL INDICATORS AND CONNECTORS There are two external indicator lights and a 10 pin electrical connector One of the indicators lights green to indicate that power has been applied to the unit The second red indicator only lights red when the 1550nm optical input power drops below 10dBm The 10 pin connector mates to the following connector OTPN 3850 Connector Molex Part Number 87833 1020 Mating Connector Molex Part Number 51110 1051 Terminals Molex Part Number 50394 8100 The function of the ten 10 pins is shown below Pini Alarm Collector Optically isolated NPN transistor Pin2 Alarm Emitter Optically isolated NPN transistor Pin3 Input Power 12 to 16 Volts DC Pin4 Ground Pin5 Optical Monitor Through 1K resistor See Figure 3 Pin6 5 Volts Through 200 Ohm resistor Pins 7 through 10 are used to identify the type of module Pin 7 Not Connected Pin8 Ground Pin9 Not Connected Pin 10 Not Connected FIGURE 2 Electrical Connector Pin Configuration 025 000641 REV X3 Olson Technology Inc Page 6 SETUP and OPERATION Mount the unit and apply power Connect the incoming fiber the fiber that carries the 1550nm CATV signal from the headend to the residence to th
6. e Optical In port Connect the upstream fiber the fiber that carries the 1310nm amp 1490nm Ethernet signals from the residence to the headend to the Optical Out port Connect the Wideband Output F connector to the equipment that processes the CATV and L Band signals Often this may be an L Band DeStacker The OTPN 3850 is designed for optimum performance at an optical input of 4dBm 1550nm power only The easiest way to verify the 1550nm input power is to measure the voltage on pin 5 of the electrical connector See Figure 2 to locate pin 5 The voltage that is measured on pin 5 can be interpreted in Figure 3 An optical input of 4dBm will yield a voltage of about 0 365 Volts on pin 5 The OTPN 3850 will give acceptable CATV performance for a 1550nm optical input ranging from OdBm to 6dBm This corresponds to voltages on pin 5 from 0 115 Volts OdBm to 0 585 Volts 6dBm This is the preferred method to verify the 1550nm power An optical power meter can be fooled if there is 1490nm or 1310nm energy on the fiber as well The Optical Alarm LED should be dark and the Power LED should be lit green The system should now be functional OTPN 3850 Optical Level Response 0 8 0 6 0 4 0 2 0 0 0 2 0 4 0 6 0 8 1 0 1 2 1 4 Optical Level V 4 2 AG 8 6 4 2 0 2 4 Input Light dBm FIGURE 3 Electrical Connector Pin Configuration 025 000641 REV X3 Olson Technology Inc Page 7 ACCESS
7. gths on the fiber a simple optical power meter may be fooled by the 1310nm or 1490nm power that may also be contained in the fiber The easiest way to measure only the 1550nm power is to use the optical level function that is built into the OTPN 3850 See Figure 3 for the exact transfer function The optical level function is calibrated at the factory and rivals the accuracy of most field optical power meters 025 000641 REV X3 Olson Technology Inc Page 3 BLOCK DIAGRAM Olson Technology OTPN 3850 SA 3 85GHz Wideband FTTH PON Receiver Optical Level Detect 1310 1490 1550nm Light Level Optical IN 1550nm Optical Out _____ 1310 amp 1490nm o Optical Level Photodiode vy Optical E B Alarm 10dBm EL Alarm E Out Amplifier 50 3 850MHZ Attenuator Control Voltage RF Output 50 3 850MHZ F Connector PIN Diode Attenuator Amplifier Filtering 12 to 16 Volts DC o 12 to 16V Notes 1 Bandwidth 50MHz to 3 850MHz 2 Flatness 50 870MHz 1 5dB 950 3 850MHz 2 5dB Any 20MHz 0 5dB 3 Output Level 23dBmV Ch Typical at 3 OMI Ch 4 AGC Range 42dB for Opt In from 0 dBm to 6dBm 5 At 4dBm Optical Input Min CATV performance is CNR 47dB CSO 55dBc CTB 55dBc 6 Loss of Light Threshold 10dBm 1dB 1550nm power only 025 000641 REV X3 Olson Technology Inc Page 4 INSTALLATION ENVIRONMENTAL CONS
8. t data at 1310nm The optical output passes the 1310nm and 1490 signals The 1550nm wavelength goes to a photodiode and is amplified The optical input level is sensed to trigger an optical alarm when the input light level is less than 10dBm The input optical level is also used to control an PIN diode attenuator to maintain constant RF level as the optical input level varies from OdBm to 6dBm The signal is then amplified and output to a single F connector output The OTPN 3850 SA Integrated PON Receiver dimensions are 1 05 H x 3 15 W x 4 75 L Optical connections are via two SC APC connectors one for the optical input carrying 1310nm 1490nm amp 1550nm the second for the optical output carrying the 1310nm and 1490nm optical signals The unit is powered from 12 to 16 Volts DC at 0 2A maximum A Green Power LED is lit whenever valid supply voltage is applied A Red LED is lit only when the 1550nm optical power drops below 10dBm the minimum usable optical input level The right side of the unit has a single F connector providing a 50 3 850MHz signal The OTPN 3850 is designed to give optimum performance at a received CATV optical power 1550nm of 4dBm although it will give good performance over the full rated optical input range of OdBm to 6dBm THEORY OF OPERATION Refer to the Block Diagram for the following discussion The Optical In to the receiver actually carries three wavelengths The 1550nm 10nm wavelength carries
9. the downstream CATV and L Band signals This wavelength passes through the FWDM Filter Wavelength Division Multiplexer to the optical detector The 1310nm and 1490nm wavelengths usually carry the Ethernet signals in a Fiber to the Home FTTH PON application They pass through the FWDM to the Optical Out port The 1490nm wavelength usually carries the downstream Ethernet signals and the 1310nm wavelength carries the upstream Ethernet signals The 1550nm light that reaches the photodiode PD is processed by two different circuits The first circuit measures the DC average current to determine what optical light level is hitting the photodiode This is converted to a logarithmic value with a scale factor of 1 Volt per decade An input level of 10dBm yields 1 0 Volts 20dBm yields 2 0 Volts etc See Figure 3 for details of this output The photodiode RF output also goes to a low noise wide bandwidth RF amplifier The output of the first amplifier goes to a wide bandwidth PIN diode attenuator which is con trolled by the Optical Level signal to keep the RF output constant For each 1dB drop in the input optical level the RF attenuation of the PIN diode attenuator is decreased by 2dB match ing the optical to RF conversion characteristics of the optical detector This circuit is optimized to operate over the optical input range from 6dBm to OdBm Note that these power levels ONLY refer to the 1550nm energy in the fiber Since there are multiple wavelen
Download Pdf Manuals
Related Search