Soliton self-frequency shifts control via Pearcey Gaussian pulses in GRIN fiber

We numerically investigate the nonlinear propagation dynamics of the Pearcey-Gaussian (PG) pulse in the presence of spatial self-imaging and Raman scattering effects in a Graded-index (GRIN) multimode optical fiber. We demonstrate that the Raman-induced frequency shift (RIFS) can be effectively controlled when PG pulse is incident. We find that the decrease of parameter C can lead to the increase of full width at half maximum (FWHM) of the red-shifted solitons and RIFS of PG pulses. In addition, the effects of the FWHM of the incident pulse and the initial chirps of the PG pulse on the RIFS are also considered. These results can broaden the application range of PG pulses in RIFS-based tunable light sources, optical communication and spectroscopy, and provide some inspiration for the PG and its derivative pulses in other nonlinear optical systems.