Optical differential-phase-shift-keyed demodulator apparatus...

Optical communications – Receiver – Including optical element

Reexamination Certificate

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Reexamination Certificate

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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.

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