Slow light with flat or offset band edges in multi-mode fiber with two gratings

TL;DR

This paper demonstrates how to control slow light in multimode fibers by manipulating band edge curvature through dual gratings, enabling flat or offset band edges for precise light delay management.

Contribution

It introduces a method to control band edge curvature in multimode fibers using two gratings, enabling tailored slow light effects.

Findings

Control of band edge curvature achieved

Ability to create flat or offset band edges

Enhanced slow light propagation control

Abstract

We consider mode coupling in multimode optical fibers using either two Bragg gratings or a Bragg grating and a long-period grating. We show that the magnitude of the band edge curvature can be controlled leading to a flat, quartic band-edge or to two band edges at distinct, nonequivalent $k$-values, allowing precise control of slow light propagation.