Patent ID: 9515763
Filing Date: 2016-12-06
CPC Classification: H04B,H04J

Claim Text:
1. A digital coherent receiver that receives a first optical signal in a wavelength division multiplexed optical signal in an optical transmission device that transmits the wavelength division multiplexed optical signal, the digital coherent receiver comprising: a front-end circuit configured to generate a digital signal indicating the first optical signal; a waveform distortion corrector configured to include a plurality of dispersion compensators and a plurality of nonlinear compensators and generate a correction result signal indicating a first optical signal whose waveform distortion has been corrected by performing a digital arithmetic operation on the digital signal using at least one of the plurality of dispersion compensators and at least one of the plurality of nonlinear compensators; and a controller configured to adjust operation states of specified dispersion compensators among the plurality of dispersion compensators and specified nonlinear compensators among the plurality of nonlinear compensators, wherein the number of the specified dispersion compensators and the number of the specified nonlinear compensators are determined based on the number of spans of an optical transmission line through which the first optical signal is transmitted, wherein the controller acquires parameters used for correcting waveform distortion of a second optical signal in the wavelength division multiplexed optical signal in another digital coherent receiver which receives the second optical signal in the optical transmission device, and gives the acquired parameters to the specified dispersion compensators and the specified nonlinear compensators.