Delay-line demodulator

Details Delay-line demodulator Delay-line demodulator

2011-02-08

2011-02-08

Petkovsek, Daniel (Department: 2874)

Optical: systems and elements

Optical demodulator

C385S001000, C385S014000, C398S205000, C375S324000

Reexamination Certificate

active

07884996

ABSTRACT:
A delay-line demodulator for demodulating a differential quadrature phase shift keying (DQPSK) signal is provided. The demodulator includes two Mach-Zehnder interferometers individually comprising two waveguides having different lengths therebetween and through which a light signal branched from the DQPSK signal propagates, respectively. A phase of the light signal propagating at one of the waveguides is delayed as compared to a phase of the light signal propagating at another one of the waveguides, wherein a divergence amount of polarization is adjusted by driving sets of heaters that are facing each other and sandwiching a half wavelength plate therebetween.

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patent: 200760442 (2007-03-01), None
patent: 2007151026 (2007-06-01), None

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