Investigation On Two Applications Of Self Phase Modulation And Cross-Phase Modulation In Photonic Crystal Fibers

Photonic Crystal Fiber (PCF) becomes Research hotspot because of its flexibility of the controllable structure and novel transmission characteristics recently. PCF has highly nonlinear characteristics, which has very broad application prospects in the production of fiber-optic devices such as supercontinuum generation,parametric amplifier,fiber laser,fiber Bragg grating,optical switching and so on, and it maybe play more important part in the development of nonlinear fiber optics. So the theoretical research and experimental analysis of self phase modulation (SPM),cross-phase modulation (XPM),four-wave mixing (FWM),stimulated raman scattering and stimulated brillouin scattering have important significance, it can provide theoretical foundation for the development of fiber-optic devices based on nonlinear effect.The paper mainly involves the following several aspects:1) Based on home and abroad Research results, SPM and XPM of PCF are researched. The PCF nonlinear characteristics and its application research background are introduced, the significance of this paper is explained.2) Soliton self-trapping is realized using the SPM and XPM of PCF, and the influence of PCF characteristic parameters such as group velocity mismatch factor, third-order dispersion, the steep factor and pulse within the raman scattering factor on soliton self-trapping is researched using Matlab based on split-step fourier method in the anomalous dispersion regime of PCF. This research has great significance for research and design a new type of microstructure fiber used to produce an excellent effect of soliton self-trapping, which can be used to realize high speed all-optical switching.3) All-optical switching is realized based on soliton trapping of birefringent PCF and its threshold power can reach THZ through changing the time lag between signal pulses. Optical switching is realized by SPM of PCF without control pulse and the performance of this switch which has lower noise and pulse shaping function becomes better as nonlinear coefficientγ_p of PCF bigger and PCF length longer. Dual-port output of optical switching is achieved using parallel array of 3×3 optical fiber coupler and XPM of PCF based on nonlinear optical loop mirror. This switch can be used in realizing switching signal detection, clock extraction, signal processing functions and is also the basic of double-ring all-optical buffer.