Impact of positive chirp on energy of dispersive waves and stability of solitons

摘要

The effect of initial frequency chirp is numerically investigated to obtain high-efficient supercontinuum radiation in photonic crystal fibers with two closely spaced zero-dispersion wavelengths. Our results show that the positive chirp can significantly improve the probability of energy transferred from the soliton to dispersive wave. And with the increase of the chirp, the energy increases obviously. At the same time, the intensity of dispersive wave is proportional to the chirp value. Especially, solitons will not appear when the chirp value exceeds 3.9. Therefore, choosing an appropriate positive chirp, we can regulate the energy of dispersive wave and solitons in photonic crystal fibers. The numerical results is of great significance in the optimizing of continuous spectrum light source as well as in the controlling of continuous spectral width and flatness.