W-shaped solitons generated from a weak modulation in the Sasa-Satsuma equation

TL;DR

This paper explores the generation of stable W-shaped solitons from weak modulations in the Sasa-Satsuma equation, revealing a novel dynamical process involving both modulational instability and stability regimes.

Contribution

It demonstrates that stable W-shaped solitons can be generated from weak modulations on a continuous wave background, offering a new method to produce high-intensity pulses.

Findings

Stable W-shaped solitons can be generated from weak modulation signals.

The process involves both modulational instability and stability regimes.

This provides a new way to produce high-intensity pulses from low-intensity backgrounds.

Abstract

We revisit on rational solution of Sasa-Satsuma equation, which can be used to describe evolution of optical field in a nonlinear fiber with some high-order effects. We find a striking dynamical process which involves both modulational instability and modulational stability regimes, in contrast to the rogue waves and W-shaped soliton reported before which involves modulational instability and stability respectively. It is demonstrated that stable W-shaped solitons can be generated from a weak modulation signal on continuous wave background. This provides a possible way to obtain stable high-intensity pulse from low-intensity continuous wave background.