Analysis of Scalable PMD Compensators Using FIR Filters and Wavelength-Dependent Optical Power Measurements

We investigate the potential of optical $n$-stage FIR filter architectures for intra-channel PMD compensation based on frequency-dependent optical power monitoring on a data-loaded channel. The measurement information is used to partially estimate the channel's Jones matrix U(omega) over the frequency band of interest, and the filter parameters are adjusted based on solving a nonlinear least-squares problem which mimics the approximate inversion of U(omega) by the filter response. Numerical studies of the optimization method and outage probability simulations show the robustness and scalability of the proposed concept.