182 X75HD Installation and Operation Manual
Preliminary—Contents are proprietary and confidential. Do not photocopy or distribute.
Appendix C: Servicing Instructions
Figure C-1. Fiber Optics Transmitting and Receiving
Laser diode
Pin photo
diode
Cross section
Core
Cladding
Optical transmitter
Optical receiver
Table C-1. Function and Description of Fiber Optic Components
Item Function Composition
Optical
transmitter
Converts a data signal
into an equivalent optical
power waveform and
couples it into an optical
fiber.
• Laser diode
• Laser diode driver
The role of the driver is to bias
the laser. Some laser drivers
contain circuitry to control power
and temperature.
Optical
receiver
Converts the incoming
optical power signal into
an output data signal.
• PIN photo diode
• Transimpedance amplifier
• Decision circuitry
The role of the receiver circuitry
is to provide standard ECL
outputs based on the input
voltage.
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