Polarization dependent Brillouin gain in randomly birefringent fibers

TL;DR

This paper investigates how polarization-dependent gain in randomly birefringent fibers influences signal alignment during stimulated Brillouin amplification, revealing nonlinear polarization effects and vector alignment behaviors.

Contribution

It provides a detailed numerical analysis of polarization vector dynamics in randomly birefringent fibers, highlighting the nonlinear polarization pulling effect and polarization alignment at high pump powers.

Findings

Signal aligns with PDG vector at high pump power

PDG vector aligns with pump's linear component and opposite circular component

Nonlinear polarization pulling influences signal polarization

Abstract

An extensive study of the alignment between the pump, the signal and the polarization dependent gain (PDG) vectors in stimulated Brillouin amplification in randomly birefringent fibers is realized by numerically integrating the equations governing the propagation. At the fiber output, the signal tends to align to the PDG vector for large pump power because of the nonlinear polarization pulling effect. The PDG vector, for large random birefringence, aligns to a state that has the same linear component of the pump but opposite circular component.