Effect of frequency chirping on supercontinuum generation in dispersion flatted and dispersion decreasing fiber

• DOI: 10.1016/j.physleta.2004.11.003
• Publication Date: 2004-11-12T17:22:52Z
• Authors: Wei Jin; Wencheng Xu; Zhaoxi Chen; Yongzhao Xu; Bingtao Yu; Hu Cui; Songhao Liu
• Keywords: Supercontinuum; Chirp; Self-phase modulation

The effect of frequency chirping on supercontinuum (SC) generation in dispersion flatted and dispersion decreasing fiber has been studied by numerical simulation based on the total field nonlinear Schrodinger equation. Our results show that a positive initial frequency chirp can significantly broaden the supercontinuum spectrum by up to approximate 80 nm, and the SC intensity increase about 5 dB. A range of optimal positive frequency chirps is identified to obtain the maximized supercontinuum bandwidth. The mechanism of this enhancement is also discussed detailedly through the evolutions of temporal and spectral width related to different pre-chirped pulses.