Abstract
Temporal solitons propagating in the vicinity of a zero-dispersion wavelength in an optical fiber emit phase-matched 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.
Highlights
Temporal solitons are fascinating localized structures in which dispersion is counterbalanced by nonlinearity [1]
This leads to a very rich and unprecedented dynamics in which (i) multiple resonant radiation (RR) are emitted from a signal fundamental soliton, (ii) each generated RR, which remains temporally localized as a result of varying dispersion, cascades its own new RR and (iii) a continuum exclusively composed of RRs spanning over 500 nm is generated
We have investigated experimentally and numerically the generation of RRs from a soliton in the vicinity of the second zero dispersion wavelength (ZDW) of dispersion-varying optical fibers
Summary
Temporal solitons are fascinating localized structures in which dispersion is counterbalanced by nonlinearity [1]. We propose a detailed experimental and numerical study of the dynamics of RR generation in a dispersionvarying photonic crystal fiber (PCF) suitably tailored so that a Raman shifting soliton hits several times the long-wavelength second ZDW This leads to a very rich and unprecedented dynamics in which (i) multiple RRs are emitted from a signal fundamental soliton (each time the soliton hits the ZDW), (ii) each generated RR, which remains temporally localized as a result of varying dispersion, cascades its own new RR and (iii) a continuum exclusively composed of RRs spanning over 500 nm is generated
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