Fast polarization state rotation compensation algorithm based on volume Kalman filter

Abstract

The invention discloses a fast polarization state rotation (RSOP) compensation algorithm based on a volume Kalman filter, which comprises the following steps of: calculating a volume point and spreading the volume point according to a state vector and an error covariance matrix of the RSOP at the previous discrete moment, and estimating the state vector and the error covariance matrix at the current moment; compensating a residual frequency offset error existing in the data after frequency offset estimation; meanwhile, a volume Kalman filtering compensation algorithm of a third-order spherical surface-phase diameter volume is combined with fast Fourier transform to estimate amplitude and phase, and carrier phase noise is compensated; and taking the constellation point as a reference benchmark of a recovery signal, and calculating by using the recovery signal to obtain an information vector, thereby updating a state vector and an error covariance matrix for estimation of a next discrete moment. According to the method, RSOP tracking and recovery are realized based on the volume Kalman filtering algorithm, the problem of signal distortion caused by fast time-varying RSOP in a high-speed polarization multiplexing system is solved, the efficiency is improved, and the complexity is reduced.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a volumetric Kalman filter-based fast polarization state rotation compensation algorithm. Background technique [0002] In recent years, the rapid development of new technologies such as cloud computing and 5G communications has led to explosive growth in global data traffic. In order to meet the ever-increasing bandwidth demands, polarization diversity multiplexing (PDM) has attracted great attention. By using two orthogonal polarization states at the same wavelength, PDM can double the transmission capacity. However, PDM systems are sensitive to polarization-damaging effects, such as rapid rotation of the polarization state (RSOP). Rapid changes in RSOP can severely degrade system performance. In some extreme cases, such as vibration sources or lightning strikes near the optical fiber, the RSOP speed of the optical link will be as high as 8Mrad / s. [0003] The...

AI Technical Summary

Problems solved by technology

However, the current scheme is difficult to well compensate the signal distortion caused by the fast time-varying RSOP in the high-speed polarization multiplexing system, the algorithm complexity is high, and the compensation accuracy and efficiency are low

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