The Switching Characteristics Of Spatial Optical Soliton In Photorefractive Nonlinear Material

When the light injects into a nonlinear material, the light intensity will lead to the changes of the material's refractive index. The generation of spatial solitons is due to the balanced results from the self-focusing phenomenon produced by the changes in the refractive index of the material, and the beam's diffraction effects. Based on the previous studies, we have achieved just under a very low power - milliwatts solitons could generate magnitude. Owing to lower power is required as well as its response speed is fast, lots of attentions are poured into the solitons'potential application in light routing, optical switching and optical communications and other aspects. This paper mainly introduces the theory base which generates spatial solitons; understands the transfer characteristic of spatial optical solitons and their interactions,;and finally introduces the method of producing optical switch. In this paper, the mathematical simulation method is a class Crank-Nicholson method. The specific work of this paper is as follows:1,Analyzing the theoretical basis of this research which starts from the spatial solitons'formation mechanism, We intend to understand the spatial solitons'formation procedure as well as solitons transport model - the dynamic photorefractive effect equation, inducing the formation of electric field and the establishment of non-linear Schrodinger equation. Finally, numerical analyzing the photorefractive spatial solitons forms.2,I introduces the whole subject's numerical methods. Firstly, I discuss the solution of Schrodinger equation using a more classical approach - beam propagation method (BPM) in detail. In addition, more novel approach -Class Crank-Nicholson is introduced. Finally, I use the latter method to conduct the numerical simulation. 3,Analyzing spatial optical solitons'transmission characteristics in nonlinear materials: two beams and three beams solitons'interaction when transferring in the material, and energy transfer process in the dissemination process. At last, I describes the propagation characteristics of discrete solitons.4,I state Nonlinear material about photorefractive spatial solitons in the opening characteristics. Putting forward two methods to realize optical soliton switching characteristics: one way is setting up the optical path, the other way is through the characteristics of the switch induced by interaction of two beams in the periodic waves of light-induced photonic lattices.