Transmission Of Optic Pulse In Non-uniform Optical Fiber System Under Raman Effect

In this paper,the variable coefficient coupled higher-order nonlinear Schr?dinger equation with higher-order effects is used as the basic theoretical model,and the transmission of the pulse in the non-uniform fiber is discussed.The influence of the third-order effect and the self-steepening effect on the Raman pulse generation is discussed.And the spectral characteristics of the pump pulse and the Raman pulse are discussed.The exact solution of the theoretical model is obtained by using the ansatz method.And the propagation characteristics of optical soliton pulses in the actual optical fiber system are studied.The propagation of optical pulses in various disturbances is also discussed.Finally,the interaction between two adjacent solitons based on exact soliton solutions form is studied.The research of this paper mainly includes the following contents:(1)The development history of optical fiber communication is reviewed in detail.The research status and technical difficulties of optical soliton communication are analyzed emphatically.The significance of higher-order effect which can't be ignored in optical soliton communication system is also introduced.(2)Considering the actual transmission of fiber,we choose the variable coefficient coupled higher-order nonlinear Schr?dinger equation as our research object.By using the split-step Fourier method,we simulate the evolution of soliton in optical fiber,and investigated the impact of higher-order nonlinear and Self-steepening effect on soliton generation.And we obtaine the pump pulse and Raman pulse spectrum to discuss some of its spectral characteristics.(3)Starting from the variable coefficient coupled higher-order nonlinear Schr?dinger equation with dispersion gain and nonlinear gain,we deduce the solution of the exact soliton solution,and then study the transmission characteristics of the exact soliton solution.And the small perturbation and random noise are added to the pulse to study the effect of disturbance on the pulse stability.(4)We also explore the interaction between two adjacent solitary waves.Through a large number of numerical simulations,we study the interaction between two adjacent solitons under the initial different separation distance.