Free space demodulator for demodulating a signal

Details Free space demodulator for demodulating a signal Free space demodulator for demodulating a signal

2006-06-30

2010-02-23

Phan, Hanh (Department: 2613)

Optical communications

Receiver

C398S188000, C398S161000, C398S102000, C398S212000, C398S213000

Reexamination Certificate

active

07668466

ABSTRACT:
A demodulator comprises an input splitter, optical device sets, and couplers. The input splitter splits an input signal comprising symbols to yield a number of signals. A first optical device set directs a signal of along a first path. A second optical device set directs another signal along a second path to yield a delayed signal. At least a portion of the second path is in free space. A path length difference between the first path and the second path introduces a symbol delay between the first signal and the second signal. A coupler receives a portion of the signal and a portion of the delayed signal to generate interference, where the interference indicates a phase shift between a phase corresponding to a symbol and a successive phase corresponding to a successive symbol.

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Jay (Y.C.) Hsieh, et al., “Athermal Demodulator for 42.7-Gb/s DPSK Signals”, www.optoplex.com/pdf/ecoc05—a—odi—final.pdf, 2 pages, 2005.
C. R. Doerr, et al., PDP12, “Simultaneous reception of both quadratures of 40-Gb/s DQPSK using a simple monolithic demodulator”, © 2005 Optical Society of America, 3 pages, 2005.

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