High Sensitivity OC-12/STM-4 APD Receivers SRX12-APD Product Description The SRX12-APD is a high sensitivity receiver module designed to exceed the SONET/SDH optical interface requirements at OC-12/STM-4 (622Mb/s) data rate. Highly reliable InGaAs/InP avalanche photodiode (APD) is used to cover the entire long wavelength range from 1100nm to 1600nm. The receivers feature a low noise GaAs transimpedance IC with AGC capability to provide an extremely wide dynamic range and high sensitivity. The APD bias voltage is temperature compensated to ensure stable operation over the entire operating temperature range. A signal detect function which indicates loss of optical input is provided. A differential optical power monitor output is also available. The SRX12-APD receivers require only a single +5V supply. The data interface signals are differential PECL. The signal detect outputs can have either PECL or TTL interface. The SRX12-APD receivers can operate over an operating case temperature range of 0°C to +70°C (“H” option) or -40°C to +85°C (“I” option). The module is housed in a 24-pin dual-in-line metal package with a single mode fiber pigtail, which is terminated with ST, FC or SC connector. Related OC-12/STM-4 transmitters & receivers STX-12: 20-pin laser transmitter SRX-12: 20-pin receiver without clock recovery (PECL SIGNAL DETECT) SRX-12-L: 20-pin receiver without clock recovery (TTL SIGNAL DETECT) SRC-12-S: 24-pin receiver with clock recovery Features Exceeds SONET/SDH OC-12/STM-4 Long Reach Specifications Optical Power Monitor Outputs -40°C to +85°C Operating Temperature Option 24-pin DIP Metal Package ST, FC or SC-connectorized Fiber Pigtail Differential PECL Data Outputs Differential PECL or TTL Signal Detect Output Option Single +5V Power Supply Absolute Maximum Ratings Parameter Storage Temperature Operating Case Temperature Operating & Storage Humidity Supply Voltage Maximum Input Optical Power Lead Soldering Temperature & Time “H” option “I” option Symbol Minimum Maximum Units TST - 40 + 85 °C 0 + 70 - 40 + 85 - - 85 % VCC 0 + 6.0 V Pin, max - - 5.0 dBm - - TOP °C 260°C, 10 sec R3.2008.04.30 Oplink Communications, Inc. SRX12-APD Receiver Performance Characteristics (Over Operating Case Temperature, VCC = 4.75 to 5.25V) All parameters guaranteed only at typical data rate Parameter Symbol Minimum Typical Maximum Units B - 622 - Mb/s - 37.0 - 40.5 - - 38.0 - 40.5 - Pmax - 8.0 - 3.0 - Increasing Light Input Psd+ - - - 38.0 Decreasing Light Input Psd- - 55.0 - - Signal Detect Hysteresis - - 0.5 - dB Wavelength of Operation λ 1100 - 1600 nm VPM - 10 - mV/µW Operating Data Rate Receiver Sensitivity (10-10 BER) 2 1 Temperature Option “I” Pmin Temperature Option “H” Maximum Input Optical Power (10-10 BER) 2 Signal Detect Thresholds Optical Power Monitor Differential Voltage (at 25°C) dBm dBm dBm Data rate ranges from 50Mb/s to 700Mb/s. However, some degradation may be incurred in overall performance. 2 Specified in average optical input power and measured at 1310nm wavelength with 223-1 PRBS at 622Mb/s. 1 Receiver Electrical Interface (Over Operating Case Temperature, VCC = 4.75 to 5.25V) Parameter Symbol Minimum Typical Maximum Units Supply Voltage VCC 4.75 5.0 5.25 V Supply Current ICC - 120 180 mA DATA Output HIGH Voltage 1 VOH VCC - 1.150 - VCC - 0.880 V VOL VCC - 1.830 - VCC - 1.555 V VOH VCC - 1.150 - VCC - 0.880 V DATA Output LOW Voltage 1 SIGNAL DETECT HIGH Voltage (PECL option) 1 VOL VCC - 1.830 - VCC - 1.555 V SIGNAL DETECT HIGH Voltage (TTL option) VOH 2.7 - VCC V SIGNAL DETECT LOW Voltage (TTL option) VOL 0 - 0.5 V VPD Output Voltage (maximum current 3mA) VPD - 90 - 60 - 20 V SIGNAL DETECT LOW Voltage (PECL option) 1 1 With termination of 50Ω to VCC - 2V. Interface Circuit Pin Assignments (Top View) +5V 1µH coil or ferrite inductor 10 0.01 0.01 10 CASE N/C SIGNAL DETECT+ SIGNAL DETECT- VPD OUTPUT VPD OUT 7,18,20 82 16 510 (Note 1) 17 3 1,24 GND VPM+ VPM- DATA+ 8 510 (Note 1) 82 VCC SRX DATA+ DATA - 9 4,11,12,13 14,15,19 DATAN/C GND 130 130 GND Note 1: This resistor is for the PECL option only. It should be omitted for TTL option. Note 2: Resistor values are in Ω, capacitor values are in µF. Oplink Communications, Inc. 2 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 CASE N/C N/C N/C VCC GND VCC SIGNAL DETECT SIGNAL DETECT + GND GND GND N/C: No internal connection All CASE pins should be grounded R3.2008.04.30 SRX12-APD Application Notes The receiver converts the incident optical power to a photocurrent via a high performance avalanche photodiode (APD). The photocurrent can be monitored via the differential voltage across the two VPM+ and VPM- output pins. It is important to note that the common mode voltage (i.e. DC voltages at PM+ and VPM-) is high (-60V typical). The APD bias voltage is temperature compensated to ensure stable operation over the entire operating temperature range. The APD bias voltage is also available as an output via the VPD output. The maximum current that this output can source is 1mA. The signal detect circuit monitors the level of the incoming optical signal and generates a logic LOW signal when an insufficient photocurrent is produced. Both differential DATA+ and DATA outputs (also SIGNAL DETECT+ and SIGNAL DETECT- if the PECL option is chosen) are open emitter PECL levels requiring termination (50Ω to VCC - 2V or 510Ω to GRD is recommended). Both differential outputs should be terminated in the same manner, even if only one is used. If the TTL option is chosen for the SIGNAL DETECT outputs, no termination resistor should be used. The power supply line should be wellfiltered. The power supply should be bypassed by 0.01 or 0.1μF ceramic chip placed as close to the receiver module as possible. APD Bias Supply 220Ω 10kΩ VPD OUT VPM- 10kΩ VPM+ APD 46335 Landing Parkway Fremont, CA 94538-6407 Tel: (510) 933-7200 Fax: (510) 933-7300 Email: [email protected] Package Outline The pigtail length from the package edge is 1.0 meter typical. Dimensions in inches [mm] Default tolerances: .xxx = ± .005”, .xx = ± .01” STX-12 SRX-12 SRX-12-L SRC-12 SRC-12-S Related Transmitter & Receiver Modules : OC-12/STM-4 Transmitter (multi-sourced 20-pin DIP) : OC-12/STM-4 Receiver without Clock Recovery, ECL SIGNAL DETECT (multi-sourced 20-pin DIP) : OC-12/STM-4 Receiver without Clock Recovery, TTL SIGNAL DETECT (multi-sourced 20-pin DIP) : OC-12/STM-4 Receiver with Clock Recovery (multi-sourced 20-pin DIP) : OC-12/STM-4 Receiver with Clock Recovery (24-pin DIP, compatible with Sumitomo SDT8712-RD) Ordering Information SRX 8 Type RX only 5V= 8 1 2 X Receivers R 2 0 0 0 Wavelength Range Temperature Range Rx 1100-1600nm APD -40 ~85˚C= I 0~70˚C= H Connector Type & Option Pigtail FC, SD-TTL= PA Pigtail ST, SD-TTL= PB Pigtail SC, SD-TTL= P5 Pigtail FC, SD-PECL= PC Pigtail ST, SD-PECL= PD Pigtail SC, SD-PECL= P4 Oplink Communications, Inc. reserves the right to make changes in equipment design or specifications without notice. Information supplied by Oplink Communications, Inc. is believed to be accurate and reliable. However, no responsibility is assumed by Oplink Communications, Inc. for its use nor for any infringements of third parties, which may result from its use. No license is granted by implication or otherwise under any patent right of Oplink Communications, Inc. R3. 2008.04.30 © 2008, Oplink Communications, Inc. 3