Performance Analysis of Decision-Aided Nonlinear Cross-Polarization Post-compensation for Dispersion-Managed PDM-BPSK/QPSK

We present experimental and numerical results on the performance of the decision-aided algorithm to cancel the nonlinear cross-polarization in dispersion-managed polarization-multiplexed systems. The compensated quality factor depends not only on the uncompensated quality factor but also on the ratio of the linear and nonlinear noise. ~ ~ symbols are. denoted by X k and. Yk . We Introduction assume dispersion compensation, polarization The performance of polarization division demuxliplexing; frequency offset, and carrier multiplexed (PDM) BPSK and QPSK systems phase cancellation have been done. The over dispersion-managed links in system-model of an XpolM + ASE channel is homogeneous wavelength division multiplexed (WDM) transmission is limited by the nonlinear 2 ~ X k 1- k k X k nk cross-polarization modulation (XpolM) [1]. (1) = + ~ 2 Y XpolM is a vectorial dynamic phenomenon n Yk 1- k k k k with the speed of a few symbols. Its strength depends on the launched power, the In (1), nk and nk are the complex additive white dispersion-map and transmitted patterns of the Gaussian noise (AWGN) terms modelling the adjacent channels [2]. Due to these features ASE, with mean zero and variance 2 . The theoretical treatment of XpolM is prohibitively XpolM coefficients k and k are complex complicated. [3]. Given XpolM is induced by the adjacent Gaussian processes, independent of both channel bit patterns, the classical singlesymbols and ASE, with the autocorrelation channel back-propagation approach cannot be * function R[k ] = n n+ k = k* n+ k , where employed for post-compensation.