Multisoliton Newton's cradles and supersolitons in regular and PT-symmetric nonlinear couplers

TL;DR

This paper reports the discovery of stable supersolitons in chains of alternating-sign solitons within nonlinear optical couplers, including PT-symmetric variants, and investigates their collision dynamics through simulations.

Contribution

It introduces the concept of stable supersolitons in nonlinear optical couplers, both regular and PT-symmetric, and explores their stability and interactions.

Findings

Stable supersolitons exist in chains of alternating solitons.

Supersolitons are stable in both regular and PT-symmetric couplers.

Collisions between supersolitons are analyzed via simulations.

Abstract

We demonstrate the existence of stable collective excitation in the form of "supersolitons" propagating through chains of solitons with alternating signs (i.e., Newton's cradles built of solitons) in nonlinear optical couplers, including the PT-symmetric version thereof. In the regular coupler, stable supersolitons are created in the cradles composed of both symmetric solitons and asymmetric ones with alternating polarities. Collisions between moving supersolitons are investigated too, by the means of direct simulations in both the regular and PT-symmetric couplers.