Discrete solitons in coupled active lasing cavities

TL;DR

This paper investigates the existence and stability of discrete spatial solitons in coupled active lasing cavities with defocusing media, discovering new stable localized structures controllable by discrete diffraction.

Contribution

It introduces a new family of stable cavity solitons in active lasing systems, expanding understanding of localized structures in nonlinear photonic resonators.

Findings

Discovery of stable bright and grey cavity solitons

Control of solitons via discrete diffraction

Stability conditions related to bistability absence

Abstract

We examine the existence and stability of discrete spatial solitons in coupled nonlinear lasing cavities (waveguide resonators), addressing the case of active defocusing media, where the gain exceeds damping in the low-amplitude limit. A new family of stable localized structures is found: these are bright and grey cavity solitons representing the connections between homogeneous and inhomogeneous states. Solitons of this type can be controlled by the discrete diffraction and are stable when the bistability of homogenous states is absent.