Optical communications – Transmitter – Including compensation
Reexamination Certificate
2005-08-09
2008-12-09
Singh, Dalzid (Department: 2613)
Optical communications
Transmitter
Including compensation
C398S197000, C398S136000, C398S137000, C398S095000
Reexamination Certificate
active
07463832
ABSTRACT:
A system and method for detecting and compensating for thermal drift in an optical network in a manner that enables an increased number of optical channels to be used on a given optical medium, such as on a single optical fiber. A pair of narrow band, closely spaced optical signals from an optical transmitter function as a “temperature probe” signal. The two narrow band signals are centered within one passband of a filter of an optical device, such as an optical router. When the two narrow band signals are transmitted back to an optical receiver via the router, the magnitudes of the two signals are compared and a determination can be made as to the magnitude and direction of thermal drift of the passbands of the filter of the optical router. A control subsystem is then used to control a heating/cooling subsystem to either heat or cool the transmitter to induce a shift in the optical signals being generated by the transmitter that causes the transmitted optical signals to effectively track the centers of the passbands of the optical router.
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Dermis, Thomas F.; Nalepka, Joseph P.; Thompson, Daniel B.; and Dawson, David E.; Article “Fly-by-Light: The Future of Flight Control Technology,”, undated.
Harness & Dickey & Pierce P.L.C.
Singh Dalzid
The Boeing Company
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