Supercontinuum Generation of Higher-Order Solitons by Fission in Photonic Crystal Fibers

Abstract

The nonlinear pulse propagation in photonic crystal fibers without slowly varying envelope approximation is studied using an improved variant of first-order wave equation. Supercontinuum generation is shown to be caused by a novel mechanism of spectral broadening through fission of higher-order solitons into redshifted fundamental solitons and blueshifted nonsolitonic radiation. Good agreement with experimental observations is found, and subcycle pulse compression is studied.

Regularizing Aperiodic Cycles of Resonant Radiation in Filament Light Bullets

“…Dynamics of solitary waves, which appear in an anomalous dispersion range, are accompanied typically by a phase-matched radiation in the normal dispersion regime [33][34][35]. This so-called resonant radiation (RR) concept represents a central process in nonlinear waveguide optics (see Refs.…”

Nonlinear optical interactions in silicon waveguides

“…This process allows dramatic spectral broadening of relatively narrow bandwidth source (pump) pulses [20]. This nonlinear process has been widely observed in photonic crystal fibers where the waveguide cross-sections are engineered to tailor the dispersion [21]. This has been so successful that commercial supercontinuum sources, based on photonic crystal fibers, have become widely available.…”

Dynamics of Raman soliton during supercontinuum generation near the zero-dispersion wavelength of optical fibers

“…3 capture this spectral shifting process and reveal a kind of spectral attraction between the soliton and the trapped part moving together as one unit. With increasing soliton order, several Raman solitons may form during the soliton fission process [4,9]. As an example, the spectrogram for the propagation of a 10th order soliton is shown in Fig.…”

“…In particular, the ideal periodic evolution of a higher-order soliton is perturbed by third-and higher-order dispersions (HOD) to the extent that it breaks into its fundamental components, a phenomenon known as soliton fission [9]. These fundamental solitons experience IPRS-induced red shifts, and this shift is largest for the shortest soliton with the highest peak power, also called the Raman soliton [4,10].…”

“…These fundamental solitons experience IPRS-induced red shifts, and this shift is largest for the shortest soliton with the highest peak power, also called the Raman soliton [4,10]. During the fission process, HOD terms lead to transfer of energy from the soliton to a narrowband resonant DW, also called non-solitonic radiation [8,9,11]. This DW is emitted on the blue side of the original pulse spectrum for positive values of third-order dispersion and is of considerable practical importance for generating blue-shifted radiation.…”