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A Modulation Format Identification Method for Coherent Optical Communication System

A technology of coherent optical communication and modulation format, applied in transmission systems, electromagnetic wave transmission systems, electromagnetic receivers, etc., can solve problems such as low computational complexity, and achieve the effect of low computational complexity and good tolerance

Active Publication Date: 2018-05-22
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and to provide a modulation format identification method for coherent optical communication systems, which has lower computational complexity and better tolerance to fiber channel damage. Ability to identify modulation formats without recovery from various channel impairments

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  • A Modulation Format Identification Method for Coherent Optical Communication System
  • A Modulation Format Identification Method for Coherent Optical Communication System
  • A Modulation Format Identification Method for Coherent Optical Communication System

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Embodiment 1

[0033] Such as figure 1 As shown, this embodiment is a method for identifying a modulation format for a coherent optical communication system, which is implemented by a coherent optical DSP algorithm module with a modulation identification function. Before it is used for polarization demultiplexing, correctly identifying the modulation format can provide a basis for subsequent modulation format-related algorithms such as polarization demultiplexing, frequency offset compensation, and carrier phase recovery, so as to ensure that the signal can be successfully recovered, demodulated, and correctly judged .

[0034] The modulation format identification method described in this embodiment mainly includes four steps, and the processing process of each step will be described in detail below.

[0035] 1. Stokes space mapping

[0036] The current coherent optical receiver receives two orthogonal polarization signals of X and Y, denoted as e x 、e y , convert it into a stokes vector...

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Abstract

The invention discloses a modulation format recognition method for a coherent optical communication system. According to the modulation format recognition method for the coherent optical communication system, according to the difference of the statistical distribution of signals in different modulation formats on a least square plane in a Stokes space and along the direction of the normal of the least square plane, the high-order cumulant of the signals is calculated, and appropriate feature parameters are extracted and selected, and therefore, recognition of commonly-used modulation formats in the coherent optical transmission system is realized. The method mainly comprises Stokes space mapping, signal preprocessing, feature value extraction and classifier algorithm calculation. The method of the invention has the advantages of low calculation complexity, high tolerance for optical fiber channel damage, capability of quickly and accurately realizing the recognition of the commonly-used modulation formats, high integration with an optical fiber communication conventional digital signal processing algorithm system, and easiness in being upgraded from an existing system.

Description

technical field [0001] The invention belongs to the research field of coherent optical communication systems, and in particular relates to a modulation format identification method for coherent optical communication systems. Background technique [0002] The research of modulation format identification in optical fiber communication system is still in its infancy, and it is a relatively new research direction with great research potential. Different from the wireless communication system, the physical layer damage of the coherent optical communication system mainly comes from the dispersion of the fiber, the nonlinear effect of the fiber, the large phase noise of the coherent optical receiver, and the damage of the polarization multiplexing signal in the fiber. Aiming at these impairments, the digital signal processing (DSP) module in the coherent optical receiver performs a series of compensations. Among them, except for the compensation algorithm for fiber dispersion, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/61H04B10/075
CPCH04B10/075H04B10/61
Inventor 刘洁贺明亮周天燕李钰骙
Owner SUN YAT SEN UNIV
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