Abstract
An adaptive Kalman filter (AKF) scheme for joint polarization and phase recovery is proposed and experimentally demonstrated. In this scheme, the noise covariance is estimated adaptively along with the recursive of KF. The simulation results show that the tuning parameter Q can adaptively converge to an optimal value in wide ranges of optical signal-to-noise ratio (OSNR), polarization rotation frequency, and laser linewidth. As a result, the proposed AKF has less OSNR sensitivity penalty, better polarization tracking capability, and laser linewidth tolerance compared with extended Kalman filter (EKF) with fixed Q value. Finally, in the experiment of 16 quadrature amplitude modulation system, AKF also shows a better polarization tracking capability than the EKF.
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