Nonlinear phase noise compensation method and system in a coherent optical fiber communication system

Abstract

The invention discloses a nonlinear phase noise compensation method and a system in a coherent optical fiber communication system. Signals enter the optical fiber from the transmitting end through themultiplexer and are transmitted to the receiving end. After coherent receiving and ADC sampling, the signals enter a receiving end DSP, wherein the receiving end DSP comprises IQ orthogonalization, dispersion nonlinear compensation, sampling clock recovery, self-adaptive channel equalization, carrier frequency offset estimation, carrier phase estimation and self-adaptive nonlinear phase tracking;initializing parameters of the adaptive nonlinear phase tracking; judging the input signal to generate a reference signal; calculating a gain factor corresponding to the sampling point according to the reference signal; updating the weight coefficient and the autocorrelation matrix of the input signal according to the gain factor so as to generate an output signal; repeating the above steps, andobtaining the output of the nth iteration through the data recursion of the (n-1) th iteration. The method does not need extra optical devices, is suitable for any system structure and modulation mode, and the DSP algorithm of the receiving end is low in calculation complexity.

Description

technical field [0001] The invention belongs to the field of optical fiber communication, and more specifically relates to a nonlinear phase noise compensation method and system in a coherent optical fiber communication system. Background technique [0002] With the massive growth of global data services, some applications with high bandwidth requirements have emerged one after another, such as 4K video, AR / VR, etc. People's demand for bandwidth is getting higher and higher, and the capacity of optical fiber communication systems needs to be further improved. Since the development of optical fiber communication, in order to improve the communication capacity, many advanced technologies, such as coherent optical communication, high-order modulation format, dense wavelength multiplexing (Dense wavelength multiplexing, DWDM), etc., have emerged one after another. For the coherent DWDM system, the current communication capacity in laboratory research is close to the limit, and h...

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Problems solved by technology

[0004] In view of the defects of the prior art, the purpose of the present invention is to provide a nonlinear phase noise compensation method and system in a coherent optical fiber communication system, aiming to solve the problem of complex nonlinear phase noise compensation methods in the existing coherent optical fiber communication system

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