Photodiode bias controller for optical receiver

Details Photodiode bias controller for optical receiver Photodiode bias controller for optical receiver

2005-06-24

2008-10-07

Chan, Jason (Department: 2613)

Optical communications

Receiver

C398S213000, C250S2140RC

Reexamination Certificate

active

07433606

ABSTRACT:
A method of, and an apparatus for, biasing photodiodes used in optical receivers or optical transceivers includes an electronic circuit for generating a bias voltage for the photodiode and a processor having a pulse-width modulation unit that produces pulse-width modulated pulses at a predetermined number of duty cycle values M. The processor is coupled to the electronic circuit such that a magnitude of the bias voltage is dependent upon a duty cycle value of at least one of the pulse-width modulated pulses. Advantageously, the processor includes a program for modulating the pulse-width modulated pulses generated by the processor between two different duty cycle values such that a number of obtainable bias voltages is greater than M. The result is a significant reduction in the number of necessary components.

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