Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Jerzy Domagala0
Date of Patent
February 19, 2008
0Patent Application Number
110265640
Date Filed
December 30, 2004
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A receiver for a differentially phase shift keying formatted optical signal, such as an RZ-DPSK formatted optical signal. Dither control loops are provided for controlling path length in a demodulator and/or for controlling the center wavelength of an optical band pass filter. A feedback loop is provided for controlling the gain of a pre-amplifier, and a method of protecting against optical transients by disabling a pre-amplifier is also provided. A preset delay may be provided to compensate for the differential delay in paths associated with the demodulator arms. When the signal is an RZ-DPSK modulated signal, a clock for retiming data from the optical signal may be derived from a signal on the data path.
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