Dynamics of cascaded resonant radiations in a dispersion-varying optical fiber

Abstract

Temporal solitons propagating in the vicinity of a zero-dispersion wavelength in an optical fiber emit phasematched resonant radiations (RRs) as a result of perturbations due to higher-order dispersion effects. These RRs propagate linearly and they usually rapidly spread out in time, thus having a very low peak power. Here, we show that the use of an engineered dispersion-varying optical fiber allows us to induce a completely new dynamics, in which a new physical mechanism-cascade of RRs-is discovered. It is explained by the fact that the RR is temporally recompressed thanks to the change of dispersion sign induced by the varying geometry along the fiber. In addition, we report the experimental evidence of physical processes that had remained unobserved experimentally so far, such as the emission of multiple RRs from a single soliton and the generation of a 500 nm continuum exclusively composed of polychromatic RRs.

Multiple QPM Resonant Radiations Induced by MI in Dispersion Oscillating Fibers

“…[4] and [5] for complete reviews). More recently, it has been shown numerically [6,7] and experimentally [8][9][10] that, by using optical fibers whose group velocity dispersion (GVD) is engineered along their propagation axis, several RRs can be generated from a single soliton. Two different configurations can be distinguished.…”

Bloch oscillations and resonant radiation of light propagating in arrays of nonlinear fibers with high-order dispersion

“…The recoil from the resonant radiation modifies the properties of the solitons [11,12] and affects the frequency of the soliton and the resonant radiation. A phenomenon closely related to Cherenkov radiation and very relevant for our present studies is the radiation of the dispersive waves by oscillating solitary structures such as high-order solitons or solitons in fibers with dispersion management that were investigated both theoretically [13] and experimentally [14]. Also spectral lines with similar characteristics were observed in the propagation of spatio-temporal oscillating nonlinear waves in multimode fibers [15].…”

Emission of Dispersive Waves from Solitons in Axially Varying Optical Fibers

“…A careful analysis of this process reveals that the continuously evolving GVD prevent the dispersive wave to strongly spread out in time [as expected in uniform fibers, see Fig. 2(d)] and allows to keep it relatively localized in time as a short pulse [34]. As a consequence, when crossing the ZDW, this pulse can emit another dispersive wave which we term cascaded dispersive wave (CDW1), in analogy with cascaded four-wave mixing processes.…”

“…[34], the cascaded dispersive wave process is due to the fact that the dispersive wave initially generated experiences a GVD that varies with length, which allows it to remain temporally localized as a pulse to initiate the generation of a cascaded dispersive wave. Here, we will study this process more into details.…”