Dual-wavelength domain wall solitons in a fiber ring laser

TL;DR

This paper reports the experimental discovery of dual-wavelength domain wall dark solitons in a fiber ring laser, highlighting their unique formation mechanism and lower pump threshold compared to traditional dark solitons.

Contribution

It introduces a new type of dark soliton formed via cross coupling between different wavelength laser beams in a fiber laser system.

Findings

Dual-wavelength dark solitons observed experimentally.

Lower pump threshold for dual-wavelength solitons compared to standard dark solitons.

Solitons separate different wavelength laser emissions.

Abstract

We report on the experimental observation of a new type of dark soliton in a fiber laser made of all normal group velocity dispersion fibers. It was shown that the soliton is formed due to the cross coupling between two different wavelength laser beams and has the characteristic of separating the two different wavelength laser emissions. Moreover, we show experimentally that the dual-wavelength dark solitons have a much lower pump threshold than that of the nonlinear Schr\"odinger equation dark solitons formed in the same laser.