The Transmission Of Combined Solitons In The Inhomogeneous Optical Fibers Under Higher-order Effects

With the rapid development of information superhighway, optical soliton communications become one of the popular modern communication technologies, because of its high speed, large capacity, long distance and the advantages of transmission without distortion.This article is based on the inhomogeneous optical fibers system. To begin with, we investigate the propagation characteristics of three kinds of combined vector solitary waves in detail when higher-order coupled nonlinear Schrodinger equation with variable coefficients is regarded as the theoretical model to describe the vector soliton transmitting in the birefringence fibers. Moreover, the transmission properties and stability of M-type combined vector solitary wave are researched in-depth under the above theoretical model. Furthermore, we present the exact combined solitary wave solution for the higher-order nonlinear Schrodinger equation (HNLS) with five-order non-Kerr nonlinearity, and then the transmission properties of the combined solitary wave are discussed. Our results maybe provide certain theoretical reference for the researching of combined solitary wave in the inhomogeneous optical fibers. And the particular contents are as follows:(1) The development of optical fiber communications are described briefly. Several important factors which influence the transmission stability of optical pulses are analyzed in detail, and the current research status of vector solitons are introduced in the inhomogeneous birefringence fibers system.(2) According to the high-order coupled nonlinear Schrodinger equation (CNLS) with variable coefficients for the theoretical model in the non-uniform birefringence fibers system, and taking into account the third-order dispersion, the self-frequency shift effect, the self-steep effect and five-order nonlinear effect, we numerically simulate the transmission of combined vector solitons passing through the inhomogeneous birefringence fibers system by adopting the Fast Fourier Transform(FFT), and the interactions between neighboring solitary waves of the three kinds of combined vector solitary waves are investigated. And the stability of the evolutions of three kinds of combined vector solitary waves are discussed when the limited noise, power perturbation and phase perturbation are added.(3) The propagation characteristics of M-type combined vector solitary wave are studied in detail on the basis of the above theoretical model, and we analyzed the transmission stability of M-type combined vector solitary wave under limited interference.(4) In the inhomogeneous optical fibers system, we present a new type of combined solitary wave solution for the higher-order nonlinear Schrodinger (HNLS) equation with variable coefficients with five-order non-Kerr nonlinearity under the condition of certain parameters by using a suitable ansatz. And the propagation characteristics of the exact combined solitary wave are studied in-depth, the results show that, the combined solitary wave can be transmitted in two different waves without distortion and has good anti-jamming.