Spectral-filtering-induced phase transition in passively mode-locked fiber lasers

TL;DR

This paper explores how tuning a spectral filter influences the dynamics of passively mode-locked fiber lasers, revealing a phase transition from noise-like pulses to bound states through entropy analysis.

Contribution

It demonstrates a phase transition in fiber laser dynamics induced by spectral filtering, using Shannon entropy to analyze dispersive Fourier transform signals.

Findings

Noise-like pulses evolve into bound states as filter bandwidth decreases.

A phase transition is identified using entropy analysis.

Spectral filtering controls laser pulse regimes.

Abstract

We investigate the effect of a tunable spectral filter on the dynamics of a passively mode-locked fiber laser in the anomalous dispersion regime. The results show that noise-like pulse emission evolves toward bound-state regime as the filter bandwidth is reduced. Thanks to the Shannon entropy applied to dispersive Fourier transform signals, it is demonstrated that the system undergoes a phase transition.