Two-color pulse compounds in waveguides with a zero-nonlinearity point

TL;DR

This paper investigates two-frequency pulse compounds in waveguides with zero-dispersion and zero-nonlinearity points, revealing novel trapping, bound-states, and effects of Raman interactions in such systems.

Contribution

It introduces the existence and behavior of two-frequency pulse compounds in waveguides with zero-nonlinearity points, including their dynamics and interactions.

Findings

Pulse compounds can be trapped by solitary-wave wells.

Bound-states of pulses can form in these waveguides.

Raman effects can alter pulse velocities depending on configuration.

Abstract

We study incoherently coupled two-frequency pulse compounds in waveguides with single zero-dispersion and zero-nonlinearity points. In such waveguides, supported by a negative nonlinearity, soliton dynamics can be obtained even in domains of normal dispersion. We demonstrate trapping of weak pulses by solitary-wave wells, forming nonlinear-photonics meta-atoms, and molecule-like bound-states of pulses. We study the impact of Raman effect on these pulse compounds, finding that, depending on the precise subpulse configuration, they decelerate, accelerate, or are completely unaffected. Our results extend the range of systems in which two-frequency pulse compounds can be expected to exist and demonstrate further unique and unexpected behavior.