Temporal variation of the spectrum of continuously-pumped random fiber laser. Phenomenological model

TL;DR

This paper investigates the temporal spectral variations in a continuously pumped erbium-doped random fiber laser using a phenomenological model that explains the observed mode instability phenomena.

Contribution

It introduces a phenomenological theoretical model that qualitatively explains the spectral variation and mode instability in random fiber lasers with distributed Bragg gratings.

Findings

Spectral variations are explained by the model.

Mode instability mechanisms are characterized.

Qualitative agreement with experimental observations.

Abstract

A temporal variation of a spectrum of excited modes in a continuously pumped erbium-doped random fiber laser (RFL), based on randomly distributed Bragg gratings, is studied. Developed phenomenological theoretical model assumes hard excitation mechanism of the eigenmodes instability. The model explains qualitatively peculiarities of the spectrum variation, observed experimentally.