Monitoring apparatus and method for an optical signal-to-noise ratio and receiver

Patent metadata

Field	Value
Publication number	US-9871581-B2
Application number	US-201615008625-A
Country	US
Kind code	B2
Filing date	Jan 28, 2016
Priority date	Feb 10, 2015
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

A monitoring apparatus and method for an optical signal-to-noise ratio and a receiver, where the apparatus includes: a processing unit configured to perform nonlinear processing on a pilot signal in received signals, or on a pilot signal in received signals and data signals in a predefined range neighboring the pilot signal; and a calculating unit configured to calculate an optical signal-to-noise ratio of the received signals according to a result of the nonlinear processing. Complexity of calculation may be lowered and accuracy of calculation of an optical signal-to-noise ratio may be improved, thereby efficiently improving the performance of the system.

First claim

What is claimed is:

1. A monitoring apparatus for an optical signal-to-noise ratio, comprising:
a processing unit configured to perform nonlinear processing on one of a pilot signal in received signals and the pilot signal in the received signals and data signals in a predefined range neighboring the pilot signal; and
a calculating unit configured to calculate an optical signal-to-noise ratio of the received signals according to a result of the nonlinear processing.

2. The apparatus according to claim 1 , wherein the apparatus further comprises:
an estimating unit configured to estimate residual dispersion in the received signals according to the pilot signal in the received signals; and
a compensating unit configured to perform dispersion compensation on the data signals in the received signals according to an estimation result of the residual dispersion;
and the calculating unit is configured to calculate noise power according to the result of the nonlinear processing, and calculate signal power according to a result of the dispersion compensation to calculate the optical signal-to-noise ratio of the received signals.

3. The apparatus according to claim 1 , wherein the apparatus further comprises:
a determining unit configured to determine a nonlinear parameter of the nonlinear processing; wherein a noise parameter making a noise power spectrum density of the pilot signals minimum is used as the nonlinear parameter of the nonlinear processing.

4. The apparatus according to claim 3 , wherein the nonlinear parameter of the nonlinear processing has at least one of a following information: nonlinear coefficient γ, lengths of optical fiber spans in a transmission link and vectors of the optical fiber spans.

5. A communication system, comprising a receiver which comprises the monitoring apparatus for an optical signal-to-noise ratio as claimed in claim 1 .

6. A monitoring method for an optical signal-to-noise ratio, comprising:
performing nonlinear processing on one of a pilot signal in received signals and the pilot signal in the received signals and data signals in a predefined range neighboring the pilot signal; and
calculating an optical signal-to-noise ratio of the received signals according to a result of the nonlinear processing.

7. The method according to claim 6 , wherein the method further comprises:
estimating residual dispersion in the received signals according to the pilot signal in the received signals; and
performing dispersion compensation on the data signals in the received signals according to an estimation result of the residual dispersion;
and the calculating an optical signal-to-noise ratio of the received signals according to a result of the nonlinear processing comprises: calculating noise power according to the result of the nonlinear processing, and calculating signal power according to a result of the dispersion compensation to calculate the optical signal-to-noise ratio of the received signals.

8. The method according to claim 6 , wherein the method further comprises:
determining a nonlinear parameter of the nonlinear processing; wherein a noise parameter making a noise power spectrum density of the pilot signals minimum is used as the nonlinear parameter of the nonlinear processing.

9. The method according to claim 8 , wherein the nonlinear parameter of the nonlinear processing has at least one of a following information: nonlinear coefficient γ, lengths of optical fiber spans in a transmission link and vectors of the optical fiber spans.

Assignees

• Fujitsu Ltd

Inventors

• Dou Liang
• Tao Zhenning

Classifications

• H04B10/0775 Primary

  Performance monitoring and measurement of transmission parameters · CPC title