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HFCT-5760ATL Datasheet(PDF) 2 Page - Agilent(Hewlett-Packard) |
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HFCT-5760ATL Datasheet(HTML) 2 Page - Agilent(Hewlett-Packard) |
2 / 16 page 2 Functional Description Receiver Section Design The receiver section for the HFCT-5760xxx contains an InGaAs/InP photo detector and a preamplifier mounted in an optical subassembly. This optical subassembly is coupled to a postamplifier/decision circuit on a circuit board. The postamplifier is ac coupled to the preamplifier. The coupling capacitors are large enough to pass the SONET/SDH test pattern at 155 Mb/s without significant distortion or performance penalty. If a lower signal rate, or a code which has significantly more low frequency content is used, sensitivity, jitter and pulse distortion could be degraded. There is a filter function which limits the bandwidth of the preamp output signal. The filter is designed to bandlimit the preamp output noise and thus improve the receiver sensitivity. Loss of Signal The Loss of Signal (LOS) output indicates that the optical input signal to the receiver does not meet the minimum detectable level for compliant signals. When LOS is high it indicates loss of signal. When LOS is low it indicates normal operation. The Loss of Signal thresholds are set to indicate a definite optical fault has occurred (eg., disconnected or broken fiber connection to receiver, failed transmitter). Transmitter Section Design A schematic diagram for the transceiver is shown in Figure 1. The HFCT-5760xxx incorporates an FP laser as its optical source. All part numbers have been designed to be compliant with IEC 825 eye safety requirements under any single fault condition and CDRH under normal operating conditions. The optical output is controlled by a custom IC that detects the laser output via the monitor photodiode. This IC provides both dc and ac current drive to the laser to ensure correct modulation, eye diagram and extinction ratio over temperature, supply voltage and operating life. Tx Fault The HFCT-5760xxx module features a transmit fault control signal output which when high indicates a laser transmit fault has occurred and when low indicates normal laser operation. A transmitter fault condition can be caused by deviations from the recommended module operating conditions or by violation of eye safety conditions. A fault is cleared by cycling the Tx Disable control input. Tx Disable The HFCT-5760xxx accepts a transmit disable control signal input which shuts down the transmitter. A high signal implements this function while a low signal allows normal laser operation. In the event of a fault (eg., eye safety circuit activated), cycling this control signal resets the module. The Tx Disable control should be actuated upon initialization of the module. Figure 1. Transceiver functional diagram EEPROM ELECTRICAL INTERFACE LOS DATA IN DATA IN TX_DISABLE TX_FAULT TRANS- IMPEDANCE PRE- AMPLIFIER FILTER AMPLIFIER OUTPUT BUFFER DATA OUT DATA OUT LASER DRIVER PHOTODIODE LASER BIAS CONTROL MODULATOR & SAFETY CIRCUITRY FP LASER MOD-DEF (2) MOD-DEF (1) MOD-DEF (0) |
Similar Part No. - HFCT-5760ATL |
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Similar Description - HFCT-5760ATL |
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