V23836-C18-C63, V23836-C18-C363 Product Specification – September 2004
FUNCTIONAL DESCRIPTION
This transceiver is designed to transmit serial data via single mode fiber.
Figure 2 Functional Diagram
The receiver component converts the optical serial data into PECL compatible electrical
data (RD+ and RD–). The Signal Detect (SD, active high) shows whether optical data
is present 1) .
The transmitter converts electrical PECL compatible serial data (TD+ and TD–) into
optical serial data.
The transmitter contains a laser driver circuit that drives the modulation and bias
currentof the laser diode. The currents are controlled by a power control circuit to
guarantee constant output power of the laser over temperature and aging.
The power control uses the output of the monitor PIN diode (mechanically built into the
laser coupling unit) as a controlling signal, to prevent the laser power from exceeding the
operating limits.
Single fault condition is ensured by means of an integrated automatic shutdown circuit
that disables the laser when it detects transmitter failures or when V CC is too high. A reset
is only possible by turning the power off, and then on again.
Notes:
1) We recommend to switch off the transmitter supply ( V CC Tx) if no transmitter input data is applied
? Finisar Corporation September 10, 2004 Rev. A Preliminary Data
4
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