Optical communications – Receiver – Including optical element
Reexamination Certificate
2007-03-12
2010-06-15
Pascal, Leslie (Department: 2613)
Optical communications
Receiver
Including optical element
Reexamination Certificate
active
07738798
ABSTRACT:
A system and method for demodulating an optical differential-phase-shift-keyed (DPSK) input signal using a Fabray-Perot etalon filter. In one embodiment the system receives a transmitted wavefront from the etalon filter and uses a detector to generate an electrical waveform from the transmitted wavefront. A comparator is used to receive an output from the detector and to generate a signal in accordance with each phase shift (i.e., bit transition) in the optical DPSK input signal. A latching flip-flop receives an output from the comparator and generates a digital signal representative of the bit pattern of the DPSK input signal. The system and method does not require the precisely matched dual optical paths of a Mach-Zehnder interferometer, and therefore is substantially less susceptible to thermal effects that could influence the operation of a conventional Mach-Zehnder interferometer in DPSK demodulation operations.
REFERENCES:
patent: 6834146 (2004-12-01), Rockwell et al.
patent: 7006725 (2006-02-01), Conway et al.
patent: 7092641 (2006-08-01), Windover
Atia et al, Demonstration of Return-to-zero Signaling in Both OOk and DPSK Formats to improve . . . Optically Preamplified Receiver, LEOS, Nov. 1999,, p. 226-227.
Balestra Chester L.
Mayer Richard C.
Harness & Dickey & Pierce P.L.C.
Pascal Leslie
The Boeing Company
LandOfFree
Optical differential-phase-shift-keyed demodulator apparatus... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical differential-phase-shift-keyed demodulator apparatus..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical differential-phase-shift-keyed demodulator apparatus... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4207085