System and method for determining nonlinear mitigation perturbative distortion coefficients using a received optical signal

Patent metadata

Field	Value
Publication number	US-2016294480-A1
Application number	US-201514675187-A
Country	US
Kind code	A1
Filing date	Mar 31, 2015
Priority date	Mar 31, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

Methods and systems are disclosed including receiving, with a processor circuit in a coherent optical receiver module, a series of electrical signals over a time period, representative of a series of optical signals received at instants of time within the time period, each of the electrical signals being indicative of a respective one of a plurality of points on an IQ plane, each of the points being spaced from one of a plurality of predetermined points in the IQ plane by a corresponding one of a plurality of distortion values; calculating, with the processor circuit, one or more perturbative coefficients based on one or more of the distortion values; and determining, with the processor circuit, data from the series of electrical signals based on the perturbative coefficient.

First claim

What is claimed is:

1 . A method, comprising:
receiving, with a processor circuit in a coherent optical receiver module, a series of electrical signals over a time period, representative of a series of optical signals received at instants of time within the time period, each of the electrical signals being indicative of a respective one of a plurality of points on an IQ plane, each of the points being spaced from one of a plurality of predetermined points in the IQ plane by a corresponding one of a plurality of distortion values; calculating, with the processor circuit, one or more perturbative coefficients based on one or more of the distortion values; and determining, with the processor circuit, data from the series of electrical signals based on the perturbative coefficient.

2 . The method of claim 1 , wherein prior to determining the data from the series of electrical signals based on the perturbative coefficient, the method comprises determining, with the processor circuit, nonlinear offsets based on the perturbative coefficient, and wherein determining the data from the series of electrical signals is based on the nonlinear offsets based on the perturbative coefficient.

3 . The method of claim 1 , wherein determining the data further comprises modifying the data to conform to the predetermined points.

4 . The method of claim 1 , wherein calculating, with the processor circuit, one or more perturbative coefficient based on one or more of the distortion values further comprises using averaging techniques applied to determinations of the distortion values over the time period.

5 . The method of claim 1 , wherein determining the data from the series of electrical signals based on the perturbative coefficient occurs before correction of the data with Forward Error Correction.

6 . The method of claim 1 , wherein determining the data from the series of electrical signals based on the perturbative coefficient occurs after correction of the data with Forward Error Correction.

7 . The method of claim 1 , wherein calculating, with the processor circuit, one or more perturbative coefficients based on one or more of the distortion values further comprises using least mean squares techniques applied to determinations of the distortion values over the time period.

8 . A coherent optical receiver module comprising one or more processor circuit configured to:
receive a series of electrical signals over a time period, representative of a series of optical signals received at instants of time within the time period, each of the electrical signals being indicative of a respective one of a plurality of points on an IQ plane, each of the points being spaced from one of a plurality of predetermined points in the IQ plane by a corresponding one of a plurality of distortion values; calculate one or more perturbative coefficients based on one or more of the distortion values; and determine data from the series of electrical signals based on the perturbative coefficient.

9 . The coherent optical receiver module of claim 8 , wherein the one or more processor circuit is configured to determine nonlinear offsets based on the perturbative coefficient prior to determining the data, and wherein determining the data is based on the nonlinear offsets based on the perturbative coefficient.

10 . The coherent optical receiver module of claim 8 , wherein the one or more processor circuit configured to determine the data further comprises the one or more processor circuit configured to modify the data to conform to the predetermined points.

11 . The coherent optical receiver module of claim 8 , wherein the one or more processor circuit configured to calculate one or more perturbative coefficient further comprises the one or more processor circuit configured to use averaging techniques applied to determinations of the distortion values over the time period.

12 . The coherent optical receiver module of claim 8 , wherein determining the data from the series of electrical signals based on the perturbative coefficient occurs before correction of the data with Forward Error Correction.

13 . The coherent optical receiver module of claim 8 , wherein determining the data from the series of electrical signals based on the perturbative coefficient occurs after correction of the data with Forward Error Correction.

14 . The coherent optical receiver module of claim 8 , wherein the one or more processor circuit configured to calculate one or more perturbative coefficient further comprises the one or more processor circuit configured to use least mean squares techniques applied to determinations of the distortion values over the time period.

15 . A coherent optical receiver module, comprising:
an input port configured to receive a series of optical signals carrying data from a transmitter module via a fiber optic link having one or more optical fiber; an output port; and one or more optical receiver comprising:
one or more photodiodes configured to receive the series of optical signals via the input port and translate the series of optical signals to a series of electrical signals representative of the series of optical signals carrying the data; and
one or more processor circuit configured to:
receive the series of electrical signals over a time period, representative of the series of optical signals received at instants of time within the time period, each of the electrical signals being indicative of a respective one of a plurality of points on an IQ plane, each of the points being spaced from one of a plurality of predetermined points in the IQ plane by a corresponding one of a plurality of distortion values;
calculate one or more perturbative coefficients based on one or more of the distortion values; and;
transmit, via the output port, one or more information signals indicative of the one or more perturbative coefficient to the transmitter module.

16 . The coherent optical receiver module of claim 15 , wherein transmitting, via the output port, one or more information signals indicative of the one or more perturbative coefficient to the transmitter module further comprises transmitting, via the output port, one or more information signals indicative of the one or more perturbative coefficient to the transmitter module for the transmitter module to modify the series of optical signals to preemptively mitigate the distortion.

17 . The coherent optical receiver module of claim 15 , wherein the one or more processor circuit configured to calculate one or more perturbative coefficient further comprises the one or more processor circuit configured to use averaging techniques applied to determinations of the distortion values over the time period.

18 . The coherent optical receiver module of claim 15 , wherein the one or more processor circuit configured to calculate one or more perturbative coefficient further comprises the one or more processor circuit configured to use least mean squares techniques applied to determinations of the distortion values over the time period.

19 . The coherent optical receiver module of claim 15 , wherein the one or more processor circuit comprises a digital signal processor, and wherein the one or more processor circuit configured to receive a series of electrical signals over a time period further comprises the one or more processor circuit configured to receive, with the digital signal processor, the series of electrical signals over the time period.

20 . The coherent optical receiver modul

Assignees

• Infinera Corp

Inventors

• Mertz Pierre Hervé
• Karar Abdullah
• Awadalla Ahmed

Classifications

• H04B10/6163 Primary

  Compensation of non-linear effects in the fiber optic link, e.g. self-phase modulation [SPM], cross-phase modulation [XPM], four wave mixing [FWM] · CPC title

• H04B10/6161 Primary

  Compensation of chromatic dispersion · CPC title