Optical communications – Receiver – Including postcompensation
Reexamination Certificate
2004-11-24
2008-08-19
Chan, Jason (Department: 2613)
Optical communications
Receiver
Including postcompensation
C398S026000, C398S027000, C398S206000, C398S207000, C398S208000, C398S210000, C398S213000
Reexamination Certificate
active
07415213
ABSTRACT:
An optical receiver having compensation for signal level transients. The receiver includes an OE converter, a transient threshold compensator, a threshold combiner and a CDR system. The OE converter receives the incoming optical signal and provides a modulated electrical signal having a high speed response for tracking the modulation on the optical signal and an averaged electrical signal having a moderate speed response for tracking changes in the average level of the optical signal. The transient threshold compensator processes the averaged electrical signal for providing a transient feedforward adjustment. The threshold combiner combines the transient feedforward adjustment with a lower speed BER feedback threshold adjustment for providing a decision threshold signal. The CDR system uses the decision threshold signal for recovering a clock, providing the BER feedback threshold adjustment, and estimating the data carried by the modulation.
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Chan Jason
Fish & Richardson P.C.
Leung Danny W
Stratalight Communications, Inc.
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