Interference Focusing for Simplified Optical Fiber Models with Dispersion

TL;DR

This paper introduces a discrete-time two-user interference channel model for optical fiber communication with WDM, capturing non-linear effects and group velocity mismatch, and proposes an interference focusing technique to optimize capacity.

Contribution

The paper develops a new channel model incorporating non-linearity and memory effects, and demonstrates a method to achieve maximum capacity pre-log with interference focusing.

Findings

Both users can achieve the maximum pre-log factor of 1 simultaneously.

The interference focusing technique effectively manages non-linear interference.

The model accurately captures the impact of group velocity mismatch.

Abstract

A discrete-time two-user interference channel model is developed that captures non-linear phenomena that arise in optical fiber communication employing wavelength-division multiplexing (WDM). The effect of non-linearity is that an amplitude variation on one carrier induces a phase variation on the other carrier. Moreover, the model captures the effect of group velocity mismatch that introduces memory in the channel. It is shown that both users can achieve the maximum pre-log factor of 1 simultaneously by using an interference focusing technique introduced in an earlier work.