# Dispersive radiation and regime switching of oscillating bound solitons in twin-core fibers near zero-dispersion wavelength

## TL;DR

This paper investigates how bound solitons in twin-core fibers generate dispersive radiation near zero-dispersion wavelength, revealing regime transitions influenced by higher order dispersion effects.

## Contribution

It provides a theoretical framework for dispersive wave generation and resonance conditions, highlighting the impact of third and fourth order dispersion on soliton dynamics.

## Key findings

- Third order dispersion causes polychromatic dispersive radiation.
- Transition from center of mass to amplitude oscillations occurs due to third order dispersion.
- Symmetric fourth order dispersion does not reproduce this transition.

## Abstract

We study resonant radiation generated by bound solitons in a twin-core fiber near zero-dispersion wavelength, in the presence of higher order dispersion terms. We propose a theoretical description of dispersive wave generation mechanism and derive resonance conditions. The presence of third order dispersion term leads to generation of polychromatic dispersive radiation and transition from the regime of center of mass oscillations to the regime of amplitude oscillations. Such a transition is not reproduced in the case of symmetric fourth order dispersion.