Parametric excitation of multiple resonant radiations from localized wavepackets

TL;DR

This paper demonstrates how periodic dispersion modulation in optical fibers can induce multiple resonant radiations from localized wavepackets, revealing a unified mechanism for solitons and shock fronts.

Contribution

It introduces an experimental setup that mimics time-periodic driving to control resonant coupling in fiber optics, unifying the understanding of different localized states.

Findings

Multiple resonant frequencies observed in fiber experiments.

Resonances explained by a unified theoretical approach.

Efficient energy transfer from localized states to dispersive waves.

Abstract

Fundamental physical phenomena such as laser-induced ionization, driven quantum tunneling, Faraday waves, Bogoliubov quasiparticle excitations, and the control of new states of matter rely on time-periodic driving of the system. A remarkable property of such driving is that it can induce the localized (bound) states to resonantly couple to the continuum. Therefore experiments that allow for enlightening and controlling the mechanisms underlying such coupling are of paramount importance. We implement such an experiment in a special fiber optics system characterized by a dispersion oscillating along the propagation coordinate, which mimics "time". The quasi-momentum associated with such periodic perturbation is responsible for the efficient coupling of energy from the localized wave-packets sustained by the fiber nonlinearity into free-running linear dispersive waves (continuum), at multiple resonant frequencies. Remarkably, the observed resonances can be explained by means of a unified approach, regardless of the fact that the localized state is a soliton-like pulse or a shock front.