Self-adaption nonlinear balanced method and device of polarization multiplexing optical communication system

Abstract

The invention provides a self-adaption nonlinear compensation method and a device of a polarization multiplexing optical communication system. The device comprises a horizontal polarization quantity compensation unit and a vertical polarization quantity compensation unit. According to the input signals, the horizontal polarization quantity compensation unit calculates linear damage values of input signals, nonlinear damage values of horizontal components of the input signals and crosstalk values of vertical components of the input signals to the horizontal components, and then compensates the horizontal components of the input signals according to the linear damage values, the nonlinear damage values and the nonlinear damage values. According to the input signals, the vertical polarization quantity compensation unit calculates linear damage values of the input signals, nonlinear damage values of vertical components of the input signals and crosstalk values of the horizontal components of the input signals to the vertical components, and compensates the vertical components of the input signals according to the linear damage values, the nonlinear damage values and the crosstalk values. The self-adaption nonlinear compensation method and the device can effectively compensate nonlinear damage in communication channels of the polarization multiplexing optical communication system.

Description

technical field [0001] The present invention relates to communication, more precisely, to a method and device for self-adaptive nonlinear equalization of polarization multiplexing optical communication system. Background technique [0002] Phase noise and waveform damage caused by self-phase modulation (Self-Phase Modulation, SPM) or intra-channel nonlinearity (intra-channel nonlinearity) is one of the main sources of cost in long-distance transmission optical communication systems. In a coherent optical communication system, the adaptive nonlinear equalization (ANLE) of a digital coherent receiver can be used to compensate the nonlinear damage from phase modulation (such as literature Y.Gao, ECOC2009, paper 9.4.7; Z . Pan, OFC2011, paper JThA40). [0003] These traditional adaptive nonlinear equalization methods are all based on the Volterra model of the single polarization system. That is to say, only the nonlinear impairment of the single-polarization signal itself is c...

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Problems solved by technology

Therefore, the traditional method cannot well compensate the nonlinear impairment in the channel of the polarization multiplexing optical communication system

For example, the literature Z.Pan, OFC2011, and paper JThA40 used traditional adaptive nonlinear equalization in polarization multiplexing optical communication systems, and the results show that the performance is not ideal

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