Abstract

Solitons emit resonant radiation (RR) owing to a universal mechanism of phase-matching with linear waves ruled by perturbing higher-order dispersive terms. Well-known examples range from fiber [1,2] to Langmuir plasma [3] or water wave solitons. During the last decade, optical fibers offered the unique opportunity to deepen the physics of RR [4], with important applicative fall-out in supercontinuum generation [5], where RR is responsible for broadening the spectrum over the blue-shifted (normally dispersive) region. More recently, the field was significantly advanced by important results recognizing the role of RR in turbulence transport, the observation of RR in different settings encompassing tapered and noble-gas-filled photonic crystal fibers, slow-light waveguides, spatial diffraction in arrays, and second-harmonic generation (SHG). Importantly, it was also shown that, in Kerr media, new frequencies can be generated owing to the coupling with the negative-frequency part of the spectrum, a process termed negative-frequency resonant radiation (NRR) [6].

© 2013 IEEE