Numerical Simulation Of Optical Properties In Microstructured Optical Fibers

This work was supported by the National "973" Basic Research Program of China "Theoretical and technical innovation on the compatibility issues of heterogeneous material for the monolithic integrated optoelectronic devices " , and the National Natural Science Foundation of China (Investigation on long wavelength GaAs quantum heterogeneous structure materials based on strain mechanism).The technology of optical fiber is important leading edge in information technology field. Photonic crystal fibers (PCFs) are a new generation of optical fibers based on photonic crystal techniques. PCFs have many novel optical properties such as endless single mode operation, controllable dispersion, high birefringence etc, compared with traditional optical fibers. Thus PCFs and PCF-based devices have attracted a great deal of attention, and have become a hot research topic in optical communications. This dissertation adopted two kinds of numerical methods to analyze the optical properties of PCFs, and the main contents of this dissertation are listed as follows:(1) Using finite difference time domain method, we wrote simulation program independently. The results showed that finite difference time domain method was a highly efficient numerical method to analyze the propagation characteristics of PCFs.(2) By means of finite element method, the effects of the structural parameters of PCFs on mode characteristics and propagation characteristics were investigated, which may be a reference for integrated design of PCFs.(3) Lateral stress-induced novel propagation characte(?)istics in PCFs were investigated. The results of simulation showed us strong stress dependence of many important parameters in PCFs. We also made predictions on the pressure resistance of PCFs theoretically.(4) The concept of semiconductor cylinder photonic crystal fiber was proposed for the first time. The modal properties of such a kind of fiber were investigated by means of finite element method. It was found that annular modes were highly confined to the thin semiconducting film. Furthermore, this kind of fiber exhibited high gain across a large spectral region.