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Agilent HFCT-5805 155 Mb/s Single Mode Fiber Optic Transceiver for ATM, SONET OC-3/SDH STM-1
Data Sheet
Features • 1300 nm Single mode transceiver for links up to 15 Km • Compliant with T1.646-1995 Broadband ISDN and T1E1.2/98-011R1 SONET network to customer installation interface standards • Compliant with T1.105.06 SONET physical layer specifications standard • Multisourced 1 x 9 pin configuration • Interchangeable with LED multisourced 1 x 9 transceivers • Unconditionally eyesafe laser IEC 825/CDRH Class 1 compliant • Integral duplex SC connector receptacle compatible with TIA/EIA and IEC standards • Two temperature ranges: 0°C - +70°C HFCT-5805B/D -40°C - +85°C HFCT-5805A/C • Single +3.3 V power supply operation and compatible LVPECL logic interfaces • Wave solder and aqueous wash process compatible • Manufactured in an ISO 9002 certified facility • Considerable EMI margin to FCC Class B Applications • ATM 155 Mb/s links for LAN backbone switches and routers • ATM 155 Mb/s links for WAN core, edge and access switches and routers • ATM 155 Mb/s links for add/drop multiplexers and demultiplexers • SONET OC-3/SDH STM-1 (S-1.1) interconnections
Description General The HFCT-5805 transceiver is a high performance, cost effective module for serial optical data communications applications specified for a data rate of 155 Mb/s. It is designed to provide a SONET/SDH compliant link for intermediate reach links operating at +3.3 V input voltage.
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ELECTRICAL SUBASSEMBLY DATA DATA POST AMPLIFIER IC PREAMPLIFIER IC OPTICAL SUBASSEMBLIES LASER DRIVER IC
PIN PHOTODIODE
SIGNAL DETECT DATA DATA
DUPLEX SC RECEPTACLE
LASER
Other Members of Agilent SC Duplex 155 Mb/s Product Family • HFCT-5801, 1300 nm single mode transceiver for links up to 15 km. The part is based on the 2 x 9 industry standard package and has laser bias, optical power monitor and transmitter disable functions. Applications Information Typical BER Performance of Receiver versus Input Optical Power Level The HFCT-5805 transceiver can be operated at Bit-Error-Rate conditions other than the required BER = 1 x 10-10 of the ATM Forum 155.52 Mb/s Physical Layer Standard. The typical trade-off of BER versus Relative Input Optical Power is shown in Figure 2. The Relative Input Optical Power in dB is referenced to the actual sensitivity of the device. For BER conditions better than 1 x 10-10, more input signal is needed (+dB).
TOP VIEW
Figure 1. Block Diagram
Transmitter Section The transmitter section of the HFCT-5805 consists of a 1300 nm InGaAsP laser in an eyesafe optical subassembly (OSA) which mates to the fiber cable. The laser OSA is driven by a custom IC which converts differential input LVPECL logic signals into an analog laser drive current. Receiver Section The receiver utilizes an InGaAs PIN photodiode mounted together with a transimpedance preamplifier IC in an OSA. This OSA is connected to a circuit providing post- amplification quantization, and optical signal detection.
Receiver Signal Detect Signal Detect is a basic fiber failure indicator. This is a single-ended LVPECL output. As the input optical power is decreased, Signal Detect will switch from high to low (deassert point) somewhere between sensitivity and the no light input level. As the input optical power is increased from very low levels, Signal Detect will switch back from low to high (assert point). The assert level will be at least 0.5 dB higher than the deassert level. Transceiver Specified for Wide Temperature Range Operation The HFCT-5805 is specified for operation over normal commercial temperature range of 0° to +70°C (HFCT-5805B/D) or the extended temperature range of -40° to +85°C (HFCT-5805A/C). Characterization of the parts has been performed over the ambient operating temperature range in an airflow of 2 m/s.
2
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10-2 10 BIT ERROR RATIO
-3
LINEAR EXTRAPOLATION OF 10-4 THROUGH 10-7 DATA BASED ON ACTUAL DATA
10-4 10-5 10-6 10-7 10-8 10-9 10-10 10-11 10-12 10-13 10-14 10-15
-5 -4 -3 -2 -1 0
1
2
3
Figure 2. Relative Input Optical Power - dBm. Avg.
Recommended Circuit Schematic In order to ensure proper functionality of the HFCT-5805 a recommended circuit is provided in Figure 3. When designing the circuit interface, there are a few fundamental guidelines to follow. For example, in the Recommended Circuit Schematic figure the differential data lines should be treated as 50 ohm Microstrip or
stripline transmission lines. This will help to minimize the parasitic inductance and capacitance effects. Proper termination of the differential data signals will prevent reflections and ringing which would compromise the signal fidelity and generate unwanted electrical noise. Locate termination at the received signal end of the transmission line. The length of these lines should be kept short and of equal length. For the high speed signal lines, differential signals should .