Polarization damage compensation method and system

The invention discloses a polarization damage compensation method and system, and belongs to the technical field of optical communication, and the method comprises the steps: carrying out the polarization damage compensation of a received signal through employing a Kalman filter, and obtaining output signals in the corresponding X and Y directions; wherein the state vector x and the Kalman filtering matrix P of the Kalman filter are updated after each time of polarization damage compensation; the state vector x is equal to (hxx, hxy, hyx, hyy); wherein hxx, hxy, hyx and hyy are tap coefficients of the CMA algorithm. According to the method, the four tap coefficients of the CMA are taken as the state vectors of the Kalman filtering, so that the Kalman filtering is prevented from respectively modeling for different polarization damages, the algorithm implementation difficulty and the modeling complexity are reduced, and the polarization damage compensation with higher accuracy can be realized with lower calcula