Prolific interaction structures and shape-changing collisions in an erbium-doped fiber system

TL;DR

This paper explores complex interactions of nonlinear waves in an erbium-doped fiber system, revealing shape-changing collisions and coexistence of multiple wave types, with implications for optical pulse dynamics.

Contribution

It introduces explicit coexistence conditions for diverse nonlinear waves and uncovers novel shape-changing collision phenomena in an erbium-doped fiber system.

Findings

Multiple nonlinear wave types can coexist and interact.

Shape-changing collisions preserve soliton energy.

Multi-peak solitons exhibit intensity redistribution during interactions.

Abstract

Prolific interactions of nonlinear waves on a plane-wave background in an erbium-doped fiber system are unveiled, based on explicit coexistence conditions extracting from the general higher-order solution of a coupled nonlinear Schr\"odinger and the Maxwell-Bloch equations. In contrast to previous results, it shows that rich different types of nonlinear waves can coexist and interact with each other. In particular, we reveal an interesting kind of shape-changing collision, in which the multi-peak solitons exhibit intensity redistribution characteristics. This interaction involves the mutual collision between multi-peak solitons as well as the interplay of multi-peak soliton and other types of localized nonlinear waves (breather and antidark soliton). We find that the shape-changing collision preserves the power of each multi-peak soliton, which is verified via optimal numerical integration for the energy of light pulse against the plane-wave background. Our results demonstrate that when the interactions occur, each multi-peak soliton exhibits the coexistence of the shape change and energy conservation.