Quadrature modulator with feedback control and optical...

Details Quadrature modulator with feedback control and optical... Quadrature modulator with feedback control and optical...

2007-02-27

2011-11-01

Odom, Curtis B (Department: 2611)

Pulse or digital communications

Transmitters

C375S279000, C375S280000, C375S308000, C332S103000, C332S104000, C332S105000, C398S188000, C359S279000

Reexamination Certificate

active

08050351

ABSTRACT:
The method and system are disclosed for automatic feedback control of integrated optical quadrature modulator for generation of optical quaternary phase-shift-keyed signal in coherent optical communications. The method comprises the steps of detecting at least a part of an output optical signal from the QPSK modulator, extracting of a particular portion of the output signal in frequency domain, and processing the signal in frequency domain to optimize the transmission of an optical link. The system and method of optical communications in fiber or free space are disclosed that implement the quadrature data modulator with automatic feedback control.

REFERENCES:
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patent: 6404535 (2002-06-01), Leight
patent: 6650458 (2003-11-01), Prosyk et al.
patent: 2002/0097874 (2002-07-01), Foden et al.
patent: 2003/0076570 (2003-04-01), Schemmann et al.
patent: 2003/0098408 (2003-05-01), Yasuoka et al.
patent: 2003/0175037 (2003-09-01), Kimmitt et al.
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patent: 2004/0081470 (2004-04-01), Griffin
patent: 2005/0117191 (2005-06-01), Griffin
patent: 2005/0196176 (2005-09-01), Sun et al.

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