A coherent light receiver dynamic balancing method based on a butterfly linear Kalman filter

Abstract

The invention brings forward a linear Kalman filter algorithm of a butterfly structure, and is used for carrying out dynamic balancing on reception signals after dispersion recovery in a coherent light communication system receiver, ie, de-multiplexing of the signals and compensation for inter-symbol crosstalk due to residual dispersion, bandwidth restriction, polarization mode dispersion, etc. are simultaneously realized. The realization steps are as follows: a tap matrix used for carrying out de-multiplexing on the signals and balancing the inter-symbol crosstalk is firstly predicted; output signals are calculated according to the predicted tap matrix and input signals; an auxiliary constraint is determined through utilization of a radius; updating of tap coefficients is realized through the linear Kalman filter; and the updated values are regarded as predicted values of iteration at the next moment; and the output signals are enabled to reach an optimal dynamic balancing effect. The algorithm brought forward by the invention has advantages of simultaneously realizing de-multiplexing and inter-symbol crosstalk compensation, suppressing singularity, being independent of phases and symbol types, having a fast convergence speed and a fast trackable polarization rotation rate.

Description

technical field [0001] The present invention relates to the communication field, and more specifically, relates to a dynamic equalization scheme in a coherent optical communication system. Background technique [0002] With the expansion of Internet and Internet of Things communication data services, and the rapid growth of multimedia services such as Internet TV and high-definition video, 10Gb / s and 40Gb / s based on technologies such as wavelength division multiplexing, erbium-doped fiber amplifiers, and intensity modulation direct detection s The bandwidth of traditional commercial optical fiber communication system has been gradually exhausted by people's increasing demand for information communication. Due to the limitation of the available bandwidth of optical fiber communication, people have turned their attention to the coherent optical communication technology with higher spectrum utilization, in order to increase the transmission rate of optical fiber communication t...

AI Technical Summary

Problems solved by technology

[0006] In view of the defects or deficiencies in the prior art, the technical problem to be solved by the present invention is: to provide a dynamic equalization method for a coherent optical receiver based on a butterfly linear Kalman filter, which can solve both traditional CMA / MMAs and their improved The method has shortcomings such as slow convergence speed, code-type correlation, poor polarization state tracking performance, and singularity, and an algorithm that can simultaneously equalize the inter-symbol crosstalk is very necessary

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