Receiving apparatus and setting method

Patent metadata

Field	Value
Publication number	US-2017366274-A1
Application number	US-201715598704-A
Country	US
Kind code	A1
Filing date	May 18, 2017
Priority date	Jun 16, 2016
Publication date	Dec 21, 2017
Grant date	—

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.

First claim

What is claimed is:

1 . A receiving apparatus comprising:
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 measure reception quality of the optical signal for each of different gamma coefficients in the PBP scheme, specify one gamma coefficient in accordance with the reception quality from among the different gamma coefficients obtained by the measuring, and set the specified gamma coefficient as a parameter of the PBP scheme.

2 . The receiving apparatus according to claim 1 ,
wherein the memory is configured to store a number of filter taps to be used as a parameter of the PBP scheme for each chromatic dispersion value of the optical transmission line, and wherein the second processor is configured to specify the number of filter taps corresponding to a designated chromatic dispersion value from the memory, and set the specified number of filter taps as the parameter of the PBP scheme.

3 . The receiving apparatus according to claim 1 , wherein the second processor is configured to start measuring the gamma coefficients when an amount of decrease in the reception quality has exceeded a predetermined threshold.

4 . The receiving apparatus according to claim 1 , wherein the second processor is configured to start measuring the gamma coefficients when the reception quality becomes below a predetermined threshold.

5 . The receiving apparatus according to claim 1 , wherein the second processor is configured to start measuring the gamma coefficients depending on a variation of a number of wavelengths of the optical signal.

6 . The receiving apparatus according to claim 1 , wherein the first processor is a digital signal processor.

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.

Assignees

• Fujitsu Ltd

Inventors

• Maeda Taizo

Classifications

• H04B10/2572

  due to forms of polarisation-dependent distortion other than PMD · CPC title

• H04B10/6162 Primary

  Compensation of polarization related effects, e.g., PMD, PDL · CPC title

• H04B10/60

  Receivers · CPC title

• H04B10/07957

  Monitoring or measuring wavelength · CPC title

• H04B10/6161

  Compensation of chromatic dispersion · CPC title