The Moments Approach for Performance Analysis of Optical FSK Systems Influenced by Phase Noise and Interchannel Interference

Abstract

The moments approach is generally considered a systematic way to perform the analysis of coherent optical systems. Exact moments of the filtered signal corrupted by phase noise enable the construction of the Gaussian quadrature rule, which may be used to calculate the system error probability. In this paper, we extend the method to a wider class of systems to include the cases where the phase-noisy interchannel interference may be significant. We derive the essential equations in the matrix form to simplify the procedure as much as possible. To illustrate the results, we apply the moments method to two-channel optical heterodyne FSK system with dual-filter receiver structure, and evaluate the required channel spacing to have less than 1 dB additional penalty due to crosstalk.