The Research Of The Optical Pulse Transmission Characteristics Based On Non-Linear Effect In Photonic Crystal Fiber

Photonic crystal fiber is a new type of fiber which made of photonic crystal structure introducing fiber .Because photonic crystal fiber is made of a single material ,it has made many fine features .Photonic crystal fiber which has the strong nonlinear effects is the studying femtosecond pulse in photonic crystal fiber transmission characteristics can not be ignored .In this paper ,by analyzing photonic crystals bandgap properties .Then ,using a numerical simulation of the photonic crystal fiber self-steepening effects caused by high order soliton splitting .Finally ,we analysis that the femtosecond pulses based on cross-phase modulation generated the changes of compression pulse .The main results are as follows:First ,we used a relatively simple method-the Finite Element Method to simulate the light transmission characteristics in photonic crystals .The Finite Element Method prepared procedures simply ,the simulation results obtained high accuracy , application for photonic crystals to provide favorable research tools. Second ,programming using Matlab ,using symmetric split step Fourier method to prepare procedures ,and by selecting the accuracy of step verify its correctness .Analysis the results of simulation ,self-steepening made the high order soliton splitting and soliton in frequency shift .At the same time the initial positive and negative chirp have a significant impact on high order soliton transmission ,laying the theoretical foundation for the analysis of soliton in the transport phenomena in photonic crystal fiber.Third ,based on the coupled nonlinear Schrodinger equation ,numerically simulated that photonic crystal fiber in the high order dispersion and high order nonlinear effects impact on femtosecond signal pulse based on cross-phase modulation effects generated ultrashort pulse .For femtosecond pulse in photonic crystal fibers compressed provide a theoretical basis.