Creating very slow optical gap solitons with inter-fiber coupling

TL;DR

This paper demonstrates the creation of extremely slow optical gap solitons in fiber Bragg gratings through inter-fiber coupling, enabling control over light propagation speeds below 2.5% of the speed of light.

Contribution

It introduces a method to generate very slow optical gap solitons via linear coupling between fibers, advancing control over slow light in fiber optics.

Findings

Optical gap solitons can be produced with velocities less than 2.5% of light speed.

Coupling between fibers enables formation of moving solitons beyond the coupling region.

The method allows precise control of soliton velocity in fiber systems.

Abstract

We show that gap-acoustic solitons, i.e., optical gap solitons with electrostrictive coupling to sound modes, can be produced with velocities down to less than 2.5% of the speed of light using a fiber Bragg grating that is linearly coupled to a non-Bragg fiber over a finite domain. Forward- and backward-moving light pulses in the non-Bragg fiber that reach the coupling region simultaneously couple into the Bragg fiber and form a moving soliton, which then propagates beyond the coupling region.