Coherent optical receiver

Details Coherent optical receiver Coherent optical receiver

2008-08-27

2011-10-11

Vanderpuye, Ken (Department: 2613)

Optical communications

Receiver

Heterodyne

C398S202000, C398S206000

Reexamination Certificate

active

08036541

ABSTRACT:
A coherent optical receiver includes a 90-degree optical hybrid circuit to which a received signal light is input, I-channel and Q-channel photo detectors to which the outputs of the hybrid circuit are input, a clock extraction circuit which reproduces a clock whose speed is the same as a demodulated signal obtained by demodulating the received signal light and which is synchronized therewith, I-channel and Q-channel sampling circuits which sample the signal outputs from the I-channel and Q-channel photo detectors by use of the clock, and a digital signal processing section which digitally processes the sampled signals, converts them to a digital signal, and outputs the digital signal. The digital signal processing section feeds a phase offset signal detected there back to the clock extraction circuit to thereby control the phase of the clock, and compensates dispersion of light within a fiber and phase fluctuation during free-space propagation.

REFERENCES:
patent: 2006/0285854 (2006-12-01), Sun et al.
patent: 11-041207 (1999-02-01), None
Kazuro Kikuchi, “Phase-Diversity Homodyne Detection of Multilevel Optical Modulation With Digital Carrier Phase Estimation”, IEEE Journal of Selected Topics in Quantum Electronics, vol. 12, No. 4, Jul./Aug. 2006, pp. 563-570.

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