Patent ID: 9048957
Filing Date: 2015-06-02
Classification: H04B

Abstract:
1. A signal processing circuit comprising: a first compensator configured to compensate for waveform distortion corresponding to chromatic dispersion of a received optical signal by using digital electrical signals obtained by sampling analog electrical signals by using a sampling signal, the analog electrical signals being obtained by opto-electric conversion of multiple optical signals that related an intensity of the received optical signal and phase information thereon; a detector configured to detect a phase offset between the sampling signal and a modulation frequency of the received optical signal; and a chromatic dispersion compensation controller configured to control a compensation value for the chromatic dispersion in the first compensation from the digital electrical signals in which the chromatic dispersion has been compensated for so that a sensitivity is increased, the sensitivity being defined as absolute value of a slope of an output value of the detector over the phase offset obtained for the phase offset close to zero.