Evolution of dark solitons in the presence of Ramangain and self-steepening effect

doi:10.1088/1674-1056/24/8/084210

Abstract Based on the equation satisfied by optical pulse that is a slowly varying function, the higher-order nonlinear Schrödinger equation (NLSE) including Raman gain and self-steepening effect is deduced in detail, and a new Raman gain function is defined. By using the split-step Fourier method, the influence of the combined effect between Raman gain and self-steepening on the propagation characteristic of dark solitons is simulated in the isotropic fiber. The results show that gray solitons can be symmetrically formed by high order dark soliton, however self-steepening effect will inhibit the formation mechanism through the phenomenon that gray solitons are produced only in the trailing edge of the central black soliton. Meanwhile, the Raman gain changes the propagation characteristic of optical soliton and inhibits the self-steepening effect, resulting in the broadening of pulse width and the decreasing of pulse offset.

Keywords: split-step Fourier method self-steepening effect dark soliton propagation characteristic

Received: 14 October 2014
Revised: 20 January 2015
Accepted manuscript online:

PACS:	42.65.Dr	(Stimulated Raman scattering; CARS)
	42.65.Tg	(Optical solitons; nonlinear guided waves)
	42.65.Re	(Ultrafast processes; optical pulse generation and pulse compression)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61167004) and the Natural Science Foundation of Inner Mongolia Autonomous Region, China (Grant No. 2014MS0104).

Corresponding Authors: Jia Wei-Guo
E-mail: jwg1960@163.com

Cite this article:

Yu Yu (于宇), Jia Wei-Guo (贾维国), Yan Qing (闫青), Menke Neimule (门克内木乐), Zhang Jun-Ping (张俊萍) Evolution of dark solitons in the presence of Ramangain and self-steepening effect 2015 Chin. Phys. B 24 084210

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Evolution of dark solitons in the presence of Ramangain and self-steepening effect

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