Self-steepening and intrapulse Raman scattering in the presence of nonlinear gain and its saturation

• Published in: Optik (Stuttgart) 2022-12, Vol.271, p.170137, Article 170137
• Main Authors: Uzunov, Ivan M., Arabadzhiev, Todor N., Nikolov, Svetoslav G.
• Format: Article
• Language: English
• Subjects: Complex cubic-quintic Ginzburg-Landau equation; Dissipative solitons; Intrapulse Raman scattering; Mode-locked lasers; Nonlinear fiber optics; Self-steepening
• ISSN: 0030-4026
• DOI: 10.1016/j.ijleo.2022.170137

In this paper we present the results of a detailed numerical investigation of the influence of the self-steepening effect on the parameters of the Raman dissipative solitons in the presence of nonlinear gain and its saturation. It has been established that when the effect of self-steepening prevails under the intrapulse Raman scattering it leads to nonlinear changes in the parameters of the Raman dissipative solitons. Comparing the impact of the intrapulse Raman scattering and self-steepening in the presence of nonlinear gain and its saturation on the dissipative solitons, the following differences have been identified: a much slighter change of the amplitude in the presence of self-steepening; different types of nonlinear dependencies of the frequency and velocity in the presence of intrapulse Raman scattering; and a substantial increase of the velocity under the influence of self-steepening. We have found that under the influence of the saturation of the nonlinear gain the observed nonlinear changes of the parameters of Raman dissipative solitons in the presence of the self-steepening effect are weaker. There has been observed a reduction of the maximum values of the amplitude and velocity as well as the maximum absolute values of the frequency of the Raman dissipative solitons.