DSP Based PMD Emulators for Built-in Testing of Coherent Optical Receivers

TL;DR

This paper introduces discrete-time MIMO FIR filter models for emulating polarization mode dispersion in optical fibers, compatible with coherent receiver techniques, enabling efficient real-time DSP testing and compensation.

Contribution

It presents novel lossless MIMO FIR filter models and sampling schemes that emulate fiber PMD channels without PDL, suitable for real-time DSP applications.

Findings

Models are lossless and emulate continuous-time PMD channels.

Flexible structure reduces computational complexity.

Suitable for real-time DSP testing and compensation.

Abstract

We propose discrete-time polarization mode dispersion (PMD) models that are compatible with the emerging coherent receiver techniques, and statistical sampling schemes for the model parameters. These models use multiple-input multiple-output (MIMO) finite impulse response (FIR) filters that are lossless and therefore lend themselves as perfect candidates for emulation of fiber channels suffering from PMD without polarization dependent loss (PDL). The concatenated composition of these filters resembles the continuous time lumped model of PMD channels and offers a flexible emulator and compensator structure in terms of computational complexity which constitutes the main bottleneck for real-time DSP applications.