OC-48/STM-16 Receiver without Clock Recovery SRX48 Seris Product Description The SRX48 modules are receivers designed to meet or exceed the SONET/SDH optical interface requirements at OC-48/STM-16 (2.488 Gb/s) data rate. Three performance versions are available which are fully compliant with Short Reach, Intermediate Reach and Long Reach specifications at 1300 nm or 1550 nm wavelength. The receiver for the Short Reach and Intermediate Reach version uses PIN photodiodes. For the Long Reach version, InGaAs avalanche photodiodes (APDs) are used to achieve high sensitivity. The Long Reach receiver features a low noise GaAs transimpedance IC with AGC capability to provide an extremely wide dynamic range. The DATA outputs are differential signals designed to be AC-coupled into 50 ohm load. A TTL Signal Detect function which indicates loss of optical input and an analog Received Optical Power Monitor output are also provided. All receiver modules can be operated with a single +5V supply. The operating temperature range is -40°C to +85°C for the Short Reach and Intermediate Reach version and 0°C to +70°C for the Long Reach version. All receivers are housed in a 24-pin dual-in-line metal package with a fiber pigtail (single mode fiber for Long Reach version and 50/125 μm multimode fiber for Short Reach and Intermediate Reach versions), which is terminated with MU, LC, ST, FC or SC connector. Features Fully compliant with SONET/SDH OC-48 (2.5 Gb/s) specifications Long Reach 1310 nm & 1550 nm as well as Intermediate Reach and Short Reach Internal temperature-compensated High Voltage APD Supply (Long Reach version) -40°C to +85°C Operating Temperature (Intermediate Reach and Short Reach) 24-pin DIP metal package MU, LC, FC, ST, SC-connectorized fiber pigtails Differential DATA interface Received Optical Power Monitor function TTL SIGNAL DETECT output Single +5 V supply Absolute Maximum Ratings Parameter Symbol Minimum Maximum Units TST - 40 + 85 °C - 40 + 85 0 + 70 Pin, max - - 5.0 dBm Supply Voltage VCC 0 + 6.0 V Input Voltage VIN 0 VCC V - - Storage Temperature Operating Case Temperature “I” option (“SR” & “IR” only) “H” option Maximum Optical Input Power (“LR” only) Lead Soldering Temperature & Time An Oplink Company TOP °C 260°C, 10 sec R5.2008.04.30 SRX48 Receiver Performance Characteristics (Over Operating Case Temperature.) Parameter Symbol Minimum Typical Maximum Units B 0.1 2.488 3.0 Gb/s - 20.0 - 24.0 - - 28.0 - 32.0 - - 3.0 - 1.0 - 0 2.0 - - 8.0 - - 6.0 Data Rate Short & Intermediate Reach Receiver Sensitivity (10-10 BER) 1 Pmin Long Reach Maximum Input Optical Power (10-10 BER) 1 Short Reach (SR) Pmax Intermediate Reach (IR) Long Reach (LR) Psd+ - - - 20.0 Decreasing Light Input Psd- - 35.0 - - Increasing Light Input Psd+ - - - 28.0 Decreasing Light Input Psd- - 42.0 - - - 0.5 1.0 - dB LR (Pin from -28 dBm to -17 dBm) VPM - 6.4 - mV/µW IR & SR (Pin from -20 dBm to 0 dBm) IPM - 0.8 - µA/µW λ 1100 - 1600 nm Signal Detect Thresholds LR Signal Detect Hysteresis Wavelength of Operation 1 dBm Increasing Light Input SR & IR Optical Power Monitor dBm dBm dBm Specified in Average Optical Input Power and measured at 2.48832 Gb/s and 1300 nm or 1550 nm wavelength with 2 -1 PRBS. 23 Receiver Electrical Interface Parameter Supply Voltage Supply Current SR & IR Symbol Minimum Typical Maximum Units VCCA’ VCCD 4.75 5.0 5.25 V - 195 250 - 225 275 I LR mA Output Voltage Swing (DATA) VPP 0.4 0.5 1.0 V Output HIGH Voltage (SIGNAL DETECT) VOH 2.7 - VCC V Output LOW Voltage (SIGNAL DETECT) VOL 0 - 0.7 V Related OC-48/STM-16 Transceiver & Receiver Modules STX-48 SRC-48 DTR-2488-SM DTR-2488-SM2 DTC-48 Oplink Communications, Inc. : Transmitter Module (24-pin DIP) : Receiver Module with Clock Recovery (24-pin DIP) : Transceiver without Clock Recovery (industry standard 1x9 package) : Transceiver without Clock Recovery (industry standard 2x9 package) : Transceiver with Clock Recovery (industry standard 2x9 package) 2 R5.2008.04.30 SRX48 Application Notes The receiver converts the incident optical power to a photocurrent via a high performance P-I-N photodiode (Short and Intermediate Reach version) or an avalanche photodiode (Long Reach version). For the Short and Intermediate Reach version, the photocurrent can be monitored via the voltage drop across an external resistor connected between PM+ and VCC. For the Long Reach version, the photocurrent can be monitored via the differential voltage across the two PM+ and PM- output pins. It is important to note that the Common Mode voltage of these two monitor outputs (i.e. DC voltages at PM+ and PM-) is high (- 60 V typical). The APD Bias Voltage is temperature compensated to ensure stable operation over the entire operating temperature range. The DATA outputs are differential signals designed to be AC-coupled into 50 ohm load. Transmission lines are recommended for best performance. The Signal Detect circuit monitors the level of the incoming optical signal and generates a TTL logic LOW signal at the SIGNAL DETECT output when insufficient photocurrent is produced. No termination resistor is required for the SIGNAL DETECT output. VCC External Monitor Resistor (3 Kohm recommended) PM+ APD 1 KΩ 10 KΩ PM+ 10 KΩ PM- PD PD Current Monitor APD Bias Supply SRX-48 SHORT & INTERMEDIATE REACH LONG REACH Interface Circuit The AC coupling capacitor is typically 0.022 µF for 2.48 Gb/s. If operation at lower data rates is required, a parrallel combination of 0.022 µF & 0.22 µF (or larger) is recommended 1 µH coil or ferrite bead (<0.2 ohm series resistance) +5V + 10 + 100 + 10 0.01 PM- 10 17,18 50 ohm line 0.01 9 SRX-48 for LR only SRX-48 22 8 20 3 DATA+ to 50 ohm load 50 ohm line DATAto 50 ohm load for SR & IR only +5V + 10 0.01 SIGNAL DETECT 4,5,6,7,11,12,13 14,15,16,19,21 Oplink Communications, Inc. 3 R5.2008.04.30 SRX48 Package Outline (Dimension in inches) 46335 Landing Pkwy Fremont, CA 94538 Tel: (510) 933-7200 Fax: (510) 933-7300 Email: [email protected] • www.oplink.com The pigtail length from the package edge is 1.0 meter typical. Pinout Assignments PIN FUNCTION PIN FUNCTION 1 N/C (NO CONNECTION) 24 N/C (NO CONNECTION) 2 N/C (NO CONNECTION) 23 N/C (NO CONNECTION) 3 SD (SIGNAL DETECT) 22 PM- (for LR), N/C (for SR & IR) 4 GND 21 GND 5 GND 20 PM+ 6 GND 19 GND 7 GND 18 VCCA (VCC ANALOG) 8 DATA OUTPUT - 17 VCCA (VCC ANALOG) 9 DATA OUTPUT + 16 GND 10 VCCD (VCC DC-DC converter) 15 GND 11 GND 14 GND 12 GND (DC-DC converter) 13 GND Ordering Information SRX 8 Supply Voltage 4 8 X 0 Receivers 5V= 8 Wavelength 1100~1600nm PIN= R1 1100~1600nm APD= R2 0 0 Temperature Range Option -40 ~85˚C= I 0~70˚C= H Pigtail FC= P1 Pigtail ST= P2 Pigtail SC= P3 Pigtail MU= P6 Pigtail LC= P9 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. R5. 2008.04.30 © 2008, Oplink Communications, Inc. 4