Coherent receiver

Details Coherent receiver Coherent receiver

2008-01-01

2008-01-01

Bayard, Emmanuel (Department: 2611)

Pulse or digital communications

Receivers

C375S325000

Reexamination Certificate

active

07315584

ABSTRACT:
A coherent receiver receives a set of signals which are spaced in phase, or phase and polarization, and a reference signal. The receiver processes the set of signals to determine which of the set of signals has a predetermined association (e.g. closest in phase) with the reference signal and selects that signal as an optimum output. The receiver has the effect of de-rotating the phase slip between the input signal and reference signal in discrete steps. The selecting occurs on a repeated basis to select an optimum output. The set of signals can be processed in the analogue or digital domains, by such techniques as: comparing the amplitude of each of the set of signals with a threshold, comparing signals with each other or cross-correlation. The processing can be implemented, if desired, without the need for complicated components, which would either be expensive or become unreliable at the extreme high operating frequencies used for optical communication.

REFERENCES:
patent: 5237287 (1993-08-01), Bar-David
patent: 5488240 (1996-01-01), Hlousek et al.
patent: 5657318 (1997-08-01), Ohmori et al.
patent: 5850437 (1998-12-01), Braams et al.
patent: 6606360 (2003-08-01), Dunning et al.
patent: 6636570 (2003-10-01), Choi et al.
patent: 7010073 (2006-03-01), Black et al.
patent: 2002/0118737 (2002-08-01), Thesling et al.
patent: 2002/0135513 (2002-09-01), Paschen et al.
patent: 2002/0154598 (2002-10-01), Furukawa et al.
patent: 2003/0131301 (2003-07-01), Shimono et al.
patent: 2004/0091064 (2004-05-01), Cao et al.
S Yamashita: “Two-Branch Double-Stage Phase-Diversity (DSPD) Coherent Receiver Using a 3x3 Fiber Coupler”, IEEE Photonics Technology Letters, vol. 6, No. 11, Nov. 1994.
F Derr: “Coherent Optical QPSK Intradyne System: Concept and Digital Receiver Realization”, Journal of Lightwave Technology, vol. 10, No. 9, Sep. 1992.

Affiliated with

Also associated with

Rating

Coherent receiver does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Coherent receiver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coherent receiver will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2796321