Differential M phase-shift modulator

Details Differential M phase-shift modulator Differential M phase-shift modulator

2007-08-27

2010-11-23

Singh, Dalzid (Department: 2613)

Optical communications

Transmitter

Including compensation

C398S183000, C398S185000, C398S188000

Reexamination Certificate

active

07840141

ABSTRACT:
The present invention is a miniaturized differential M phase-shift modulator (M=2n: n is 2 or more) in which a plurality of Mach-Zehnder type light modulators each adapted to output a DPSK-modulated signal light by applying a driving voltage signal are arranged in parallel and that comprises a multiplexing waveguide adapted to output a DMPSK-modulated light by multiplexing outputs of the plurality of the Mach-Zehnder type light modulators, wherein a phase-shift voltage to produce a phase shift difference of substantially 2π/M for a plurality of the signal lights multiplexed by the multiplexing waveguide is applied to the plurality of the Mach-Zehnder type light modulators together with the driving voltage signal.

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European Patent Office Search Report issued Mar. 20, 2008 for corresponding European Patent Application No. 070169131.
English language first page of WIPO Publication No. WO 02/051041, published Jun. 27, 2002.

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