Receiving apparatus and setting method

Abstract

A receiving apparatus includes a first processor configured to compensate, in a perturbation back-propagation (PBP) scheme, waveform degradation of an optical signal by traveling an optical transmission line due to a nonlinear optical effect; a memory; and a second processor coupled to the memory and the second processor configured to change a gamma coefficient to be used in the PBP scheme, measure reception quality of the optical signal for each of gamma coefficients obtained by the changing, specify a gamma coefficient in accordance with the reception quality from among the gamma coefficients obtained by the changing, and set the specified gamma coefficient as a parameter of the PBP scheme.

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         7 . A receiving apparatus comprising:
 a first processor;   a memory; and   a second processor coupled to the memory,   wherein the first processor is configured to compensate, in a nonlinear polarization crosstalk canceller (NPCC) scheme, waveform degradation of an optical signal from an optical transmission line due to a nonlinear optical effect,   wherein the second processor is configured to provide averaging lengths to be used in the NPCC scheme to the first processor,   wherein the first processor is configured to measure reception quality of the optical signal for each of averaging lengths provided by the second processor, and   wherein the second processor is configured to   specify one averaging length in accordance with the reception quality from among the averaging lengths obtained by the measuring, and   set the specified averaging length as a parameter of the NPCC scheme.   
     
     
         8 . The receiving apparatus according to  claim 7 , wherein the first processor is a digital signal processor. 
     
     
         9 . A setting method to be executed by a computer provided in a receiving apparatus configured to compensate, in a nonlinear polarization crosstalk canceller (NPCC) scheme, waveform degradation of an optical signal from an optical transmission line due to a nonlinear optical effect, the setting method comprising:
 measuring reception quality of the optical signal for each of averaging lengths in the NPCC;   specifying one averaging length in accordance with the reception quality from among the averaging lengths obtained by the measuring; and   setting the specified averaging length as a parameter of the NPCC scheme.