Influence of Stimulated Raman Scattering on Kerr domain walls and localized structures

TL;DR

This paper studies how stimulated Raman scattering affects the formation, stability, and dynamics of localized states in fiber resonators, revealing the emergence of bright moving states due to symmetry breaking.

Contribution

It provides a detailed bifurcation analysis showing how Raman scattering modifies localized structures and enables new bright states in fiber resonator systems.

Findings

Raman scattering breaks reflection symmetry and alters domain wall dynamics.

Bright moving localized states emerge due to Raman effects.

Bifurcation analysis classifies stability and dynamics of localized states.

Abstract

We investigate the influence of the stimulated Raman scattering on the formation of bright and dark localized states in all-fiber resonators subject to a coherent optical injection, when operating in the normal dispersion regime. In the absence of the Raman effect, and far from any modulational instability, localized structures form due to the locking of domain walls connecting two coexisting continuous wave states, and undergo a particular bifurcation structure known as collapsed snaking. The stimulated Raman scattering breaks the reflection symmetry of the system, and modifies the dynamics, stability, and locking of domain walls. This modification leads to the formation of, not only dark, but also bright moving localized states, which otherwise are absent. We perform a detailed bifurcation analysis of these localized states, and classify their dynamics and stability as a function of the main parameters of the system.