Numerical investigation on the dynamic propagation of finite-energy Airy pulses in photonic crystal fibre

摘要

We report on numerical analysis of the dynamic propagation of finite-energy Airy pulses (FEAPs) in photonic crystal fibre (PCF) at 835nm wavelength. We focus on the influence of self-phase modulation (SPM), intrapulse Raman scattering (IRS), as well as self-steepening (SS) on the dynamic propagation of FEAPs under three circumstances, i.e. SPM alone affected, and the combined effect of the first two or all three mentioned above. Furthermore, the influence of the truncation coefficient and initial frequency chirp is discussed in detail. Our results demonstrate that the FEAP can slow down gradually with the increase of the peak power during propagation, while higher-order nonlinear effects, such as IRS and SS, are beneficial for widening and flatting the supercontinuum (SC); the SC becomes wider with decreasing the truncation coefficient; compared to negative initial chirp, positive initial chirp can enhance SC generation, i.e. leading to a broader SC.