Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Hiroki Ooi0
Hiroshi Onaka0
Takeshi Hoshida0
Date of Patent
January 11, 2011
Patent Application Number
11785896
Date Filed
April 20, 2007
Patent Primary Examiner
Patent abstract
A variable dispersion compensating unit compensates an optical signal, and changes the compensation amount according to a control signal that has a given frequency. After demodulation of the compensated optical signal, error conditions of the signal are monitored and an error signal is output. A band pass filter filters the error signal for a component having a frequency equal to or less than the given frequency. Based on the component and on the control signal, a synchronous detecting circuit generates a compensation amount modification signal. The compensation amount modification signal is superposed on the control signal.
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