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SVM (support vector machine)-based nonlinear damage removing device of coherent optical communication system

A technology of support vector machine and nonlinear damage, applied in the field of optical communication, which can solve the problem that the DBP algorithm cannot receive real-time signal processing and so on.

Inactive Publication Date: 2013-06-26
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its complexity is one of the main obstacles to the use of the DBP algorithm
In addition, since the DBP algorithm is based on signal blocks, the receiving end needs to buffer a certain amount of signals before processing, which makes the DBP algorithm cannot be directly used for real-time processing of received signals

Method used

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  • SVM (support vector machine)-based nonlinear damage removing device of coherent optical communication system
  • SVM (support vector machine)-based nonlinear damage removing device of coherent optical communication system
  • SVM (support vector machine)-based nonlinear damage removing device of coherent optical communication system

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Embodiment Construction

[0028] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The described embodiments are only illustrative and not restrictive of the invention. In order to enable those skilled in the art to easily understand the principles and implementations of the present invention, the implementations of the present invention will be described by taking nonlinear impairment cancellation of a 16QAM modulated coherent optical communication system as an example. However, it should be noted that the real-time method of the present invention is applicable to coherent optical communication systems with different modulation formats, and is not limited to the modulation methods introduced in this embodiment.

[0029] image 3 It is a structural schematic diagram of performing optical fiber dispersion and nonlinear compensation on the signal at the receiving end of the present invention. The device includes: a signal receiving end 3...

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Abstract

The invention discloses an SVM (support vector machine)-based nonlinear damage removing device of a coherent optical communication system. The device disclosed by the invention comprises a chromatic dispersion compensating unit, an SVM array unit, an SVM training unit, a logical processing unit and a sign deciding unit, wherein the chromatic dispersion compensating unit is used for compensating optical fiber dispersion applied to receiving signals; the SVM array unit is used for carrying out binary classification on the receiving signs according to different classification rules via a plurality of SVMs; the SVM training unit is used for defining a classification hyper plane of each SVM in the device according to a certain training sequence; the logical processing unit is used for performing logical operation on classification results of each SVM to acquire type signs corresponding to the signals; and the sign deciding unit is used for decoding the signal type signs to binary sequences corresponding to the signals. The SVM-based nonlinear damage removing device of the coherent optical communication system can be used for removing optical nonlinear damage to the signals by virtue of the nonlinear classification characteristic of the SVM. Without requirements of knowing the nonlinear characteristic of optical fibers, the nonlinear damage removing effect is ensured and the processing complexity is only decided by the number of a small quantity of support vectors.

Description

technical field [0001] The present invention relates to the field of optical communication, and more specifically relates to a device for eliminating the nonlinear damage of optical fiber suffered by received signals by using the nonlinear binary classification characteristic of support vector machine (SVM) in a coherent optical communication system. Background technique [0002] In optical fiber communication systems, compared with direct detection reception, coherent detection reception allows the transmitted information to be encoded in multiple degrees of freedom of the optical carrier, including amplitude, phase, and polarization state. Therefore, the coherent optical communication system can allow the system to adopt a higher-order modulation format to improve the spectrum utilization rate of the system. However, as the modulation order increases, in order to obtain a higher signal-to-noise ratio (SNR), it means that more transmission power is required, and the increas...

Claims

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Application Information

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IPC IPC(8): H04B10/2513H04B10/2543H04B10/61
Inventor 李敏良喻松杨杰韩祎顾畹仪
Owner BEIJING UNIV OF POSTS & TELECOMM
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