Abstract

Optical Cherenkov radiation (OCR) is referred to as dispersive wave (DW) generation or non-solitonic radiation originating from soliton propagation perturbed by high order dispersion (HOD). The OCR becomes of particular importance for octave-spanning spectral broadening and blue-shifted supercontinuum generation (SCG) [1]. When the OCR generation lies in the anomalous GVD region and tends to be a soliton state, the phase-matching (PM) condition between linear DWs and the soliton could become a soliton PM condition: β_s(ω_s) = β_s(ω_r), provided that v_g(ω_s) = v_g(ω_r). β_s(ω_k) ≡ β (ω_k) + (ω − ω_k)/v_g(ω_k) + q_k reflects the nondispersive nature of the soliton at the center frequency ω_k and v_g(ω_k) is the group velocity. k = r, s represents the radiation or soliton wave. A sharp spectral switching of the soliton due to the soliton spectral tunneling (SST) effect in the photonic crystal fibers (PCFs) can occur across a normal group velocity dispersion (GVD) region, which is sandwiched in the anomalous GVD regions [2]. This approach shows a new efficient wavelength conversion scheme, and we explore the cascaded OCR to enlarge the span of the wavelength conversion.

© 2013 IEEE