Optical communications – Transmitter and receiver system – Including synchronization
Reexamination Certificate
2006-06-06
2006-06-06
Payne, David C. (Department: 2638)
Optical communications
Transmitter and receiver system
Including synchronization
C398S154000
Reexamination Certificate
active
07058312
ABSTRACT:
A clock recovery circuit for synchronizing a clock signal having frequency of approximately f0with an optical data signal having a frequency of N×f0, where N is an arbitrary rational number, includes a local oscillator for generating the clock signal, a sampler for producing an output signal indicative of a phase difference between the clock signal and the optical data signal, an optical detector coupled to detect the output signal as an electrical signal, and a mixer for isolating at least one harmonic of the electrical signal and for downconverting the at least one harmonic to a baseband error signal. The local oscillator is tuned in response to the baseband error signal to synchronize the clock signal with the optical data signal.
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Agere Systems Inc.
Payne David C.
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