Outage Probability Due to PMD in Coherent PDM QPSK Systems With Electronic Equalization

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Executive Summary

Polarization-Division-Multiplexed (PDM) Quadrature Phase-Shift-Keying (QPSK) coherent optical systems employ blind adaptive electronic equalizers for polarization-mode dispersion compensation. In this paper, the authors compare the performance of fractionally spaced, linear electronic equalizers, composed of four parallel Finite Impulse Response (FIR) filters of various lengths, using the outage probability as a performance criterion. The constant modulus algorithm is applied for the adaptation of FIR filter coefficients. A parallel programming implementation of the multi-canonical Monte Carlo method is adopted for the estimation of the tails of the outage probability distribution.

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