Patent ID: 9306675
Filing Date: 2016-04-05
CPC Classification: H04B

Claim Text:
1. A digital coherent receiver, comprising: an acquisition circuit configured to acquire a plurality of digital electrical signals obtained by sampling a plurality of analog electrical signals by using a sampling signal and digitally converting the plurality of analog electrical signals, the plurality of analog electrical signals being obtained by subjecting a plurality of optical signals to photoelectric conversion; a wavelength dispersion compensation circuit, coupled to the acquisition circuit, configured to compensate wavelength dispersion of the digital electrical signals; a phase deviation detector, coupled to the wavelength dispersion compensation circuit, configured to output a detection value corresponding to a phase deviation between the sampling signal and the optical signals by using the digital electrical signals output from the wavelength dispersion compensation circuit; a sensitivity monitor circuit, coupled to the wavelength dispersion compensation circuit, configured to monitor the digital electrical signals output from the wavelength dispersion compensation circuit; and a determination, coupled to the sensitivity monitor circuit, circuit configured to determine whether or not a variation amount of a monitor value output from the sensitivity monitor circuit is equal to or less than a first variation amount and output, to the wavelength dispersion compensation circuit, a compensation amount for compensating wavelength dispersion of the digital electrical signals based on the monitor value when the variation amount equal to or less than the first variation amount.