Pure-Quartic Solitons

TL;DR

This paper introduces a novel class of bright optical solitons called pure-quartic solitons, which arise from negative fourth-order dispersion and self-phase modulation, expanding the understanding of soliton physics and potential applications.

Contribution

It reports the first experimental and theoretical demonstration of pure-quartic solitons, a new type of soliton formed by fourth-order dispersion effects in photonic crystal waveguides.

Findings

Experimental observation of shape-preserving pure-quartic solitons

Analytic derivation of soliton shape matching experiments

Potential applications in communications and ultrafast lasers

Abstract

Temporal optical solitons have been the subject of intense research due to their intriguing physics and applications in ultrafast optics and supercontinuum generation. Conventional bright optical solitons result from the interaction of anomalous group-velocity dispersion and self-phase modulation. Here we report the discovery of an entirely new class of bright solitons arising purely from the interaction of negative fourth-order dispersion and self-phase modulation, which can occur even for normal group-velocity dispersion. We provide experimental and numerical evidence of shape-preserving propagation and flat temporal phase for the fundamental pure-quartic soliton and periodically modulated propagation for the higher-order pure-quartic solitons. Using analytic theory, we derive the approximate shape of the fundamental pure-quartic soliton exhibiting excellent agreement with our experimental observations. Our discovery, enabled by the unique dispersion of photonic crystal waveguides, could find applications in communications and ultrafast lasers.