A diffusion approximation theorem for a nonlinear PDE with application to random birefringent optical fibers

TL;DR

This paper extends diffusion approximation theory to nonlinear PDEs, specifically applied to pulse propagation in randomly birefringent optical fibers, establishing existence, uniqueness, and asymptotic dynamics of solutions.

Contribution

It generalizes diffusion approximation from linear to nonlinear systems of random Schrödinger equations in optical fiber modeling.

Findings

Proved existence and uniqueness of solutions for the nonlinear random PDE.

Derived asymptotic dynamics for the nonlinear electric field.

Extended diffusion approximation theory to nonlinear PDEs in optical contexts.

Abstract

In this article we propose a generalization of the theory of diffusion approximation for random ODE to a nonlinear system of random Schr\"{o}dinger equations. This system arises in the study of pulse propagation in randomly birefringent optical fibers. We first show existence and uniqueness of solutions for the random PDE and the limiting equation. We follow the work of Garnier and Marty [Wave Motion 43 (2006) 544-560], Marty [Probl\`{e}mes d'\'{e}volution en milieux al\'{e}atoires: Th\'{e}or\`{e}mes limites, sch\'{e}mas num\'{e}riques et applications en optique (2005) Univ. Paul Sabatier], where a linear electric field is considered, and we get an asymptotic dynamic for the nonlinear electric field.