Strong Raman-induced non-instantaneous soliton interactions in gas-filled photonic crystal fibers

TL;DR

This paper presents an analytical model to study Raman-induced non-instantaneous interactions between successive solitons in gas-filled photonic crystal fibers, revealing complex nonlinear phenomena like spectral oscillations and index modulation.

Contribution

It introduces a perturbation theory-based analytical model for soliton interactions in Raman-active gases within photonic crystal fibers, highlighting new nonlinear effects.

Findings

Spectral and temporal soliton oscillations observed.

Transport of trailing soliton towards the leading one.

Spatiotemporal modulation of the refractive index.

Abstract

We have developed an analytical model based on the perturbation theory in order to study the optical propagation of two successive intense solitons in hollow-core photonic crystal fibers filled with Raman-active gases. Based on the time delay between the two solitons, we have found that the trailing soliton dynamics can experience unusual nonlinear phenomena such as spectral and temporal soliton oscillations and transport towards the leading soliton. The overall dynamics can lead to a spatiotemporal modulation of the refractive index with a uniform temporal period and a uniform or chirped spatial period.