Optical signal demodulator

Details Optical signal demodulator Optical signal demodulator

2006-11-29

2008-08-12

Sanghavi, Hemang (Department: 2874)

Optical: systems and elements

Optical demodulator

C398S140000, C398S161000, C398S188000, C398S212000

Reexamination Certificate

active

07411725

ABSTRACT:
A demodulator includes: a Michelson interferometer having: a half-mirror which splits an optical signal, emits a first split light to a first optical path, and emits a second split light to a second optical path; a first reflector which reflects the first split light to the half-mirror; and a second reflector which reflects the second split light to the half-mirror, wherein the half-mirror recombines the first split light and the second split light, and emits a recombined optical signal while splitting the recombined optical signal; and an balanced optical detector which receives the recombined optical signals from the Michelson interferometer, and generates a demodulated signal based on the two recombined optical signals. The length difference between the first optical path and the second optical path is set so that the second split light has a delay time equal to a one-bit period, with respect to the first split light.

REFERENCES:
patent: 2007/0070505 (2007-03-01), Hsieh
patent: 2007/0081826 (2007-04-01), Liu
patent: 2004-516743 (2004-06-01), None
patent: WO 02/51041 (2002-06-01), None

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