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

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...

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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...

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