Stable bright and vortex solitons in photonic crystal fibers with inhomogeneous defocusing nonlinearity

TL;DR

This paper predicts the existence of stable bright and vortex solitons in photonic crystal fibers with inhomogeneous defocusing nonlinearity that increases towards the fiber's periphery, expanding understanding of soliton support in such media.

Contribution

It introduces a novel mechanism where inhomogeneous defocusing nonlinearity enables stable solitons, even with a linear core, in photonic crystal fibers.

Findings

Stable bright and vortex solitons can exist with inhomogeneous defocusing nonlinearity.

Soliton existence depends on the nonlinearity growth rate and core properties.

Solitons are possible even when the core material is linear.

Abstract

We predict that a photonic crystal fiber whose strands are filled with a defocusing nonlinear medium can support stable bright and also vortex solitons if the strength of the defocusing nonlinearity grows toward the periphery of the fiber. The domains of soliton existence depend on the transverse growth rate of the filling nonlinearity and nonlinearity of the core. Remarkably, solitons exist even when the core material is linear.