Noise-like Pulses from an All-Normal-Dispersion Fiber Laser with Weakened Spectrum Filtering

TL;DR

This study explores the generation of noise-like pulses in an all-normal-dispersion fiber laser, demonstrating how spectrum filtering influences pulse stability and dynamics through experimental and numerical methods.

Contribution

It provides new insights into how spectrum filtering affects noise-like pulse formation and stability in all-normal-dispersion fiber lasers, combining experimental and numerical analysis.

Findings

Stable dissipative soliton state achieved with spectrum filter.

Noise-like pulses form without spectrum filter as random pulse clusters.

Numerical simulations confirm the role of feedback in pulse stability.

Abstract

Noise-like pulses (NLP) are extremely sought after in many fields. Here, we experimentally and numerically investigated the generation of noise-like pulses in an all-normal-dispersion fiber laser with weak spectrum filtering. With the insertion of the grating as a tunable spectrum filter, the laser operates at a stable dissipative soliton state with a 3.84 ps duration. Replacing the grating with a mirror, NLPs with double-scale intensity autocorrelation trace is ultimately attained. Numerical simulations are performed in detail and demonstrated that with the absence of a spectrum filter, the stable state cannot be established but form the random pulse cluster. The random pulse cluster achieves dynamic stability with suitable feedback, and the NLP is ultimately generated. The NLP here is directly evolved by the initial noise, and no other states occur during its evolution. These explorations could deepen the understanding of NLP and enrich the complex dynamics of the ANDi ultrafast fiber laser.