Analysis And Design Of Dispersion Characteristics Of All Solid Photonic Crystal Fibers

Photonic crystal fiber can achieve many excellent optical properties that traditional fibers can not achieve, such as endless single mode, high nonlinearity, large mode area,controllable dispersion, etc. It is widely applied in military and civil fields and has become a topic of general interest to researchers in many countries. Many important applications of photonic crystal fibers are related to their dispersion characteristics. It is necessary to precisely control geometric parameters of photonic crystal fiber during drawing because of the large relative refractive index difference between quartz and air hole, otherwise it will appear great changes in dispersion. In addition, the air hole is easy to collapse or the design of the cladding structure is very complex, which all make it difficult to produce.Therefore, the study on the dispersion characteristics of all solid photonic crystal fiber which is easy to be drawn and has small refractive index difference is very necessary.The main contents of this paper are as follows:Firstly, the definition, classification of photonic crystal fiber are introduced. The advantages, development of all solid fiber are introduced. The significance of the research on the dispersion of all-solid photonic crystal fiber is summarized.Secondly, the dispersion theory, some common analysis methods are introduced, the theory of the finite element method and the simulation steps of photonic crystal fiber by using Comsol software is introduced in detail. Then in order to judge the correctness of the finite element model, we simulate the dispersion curve of NL-2.6-825 type optical fiber.Thirdly, the material dispersion of quartz doped with different concentrations of germanium or fluoride is analyzed. The influence of the geometrical parameters of the cladding on the single core or two-core all solid photonic crystal fibers is analyzed,which is based on Germanium doped Silica as the base and fluorine doped silica as the dielectric cylinder.Finally, the geometric parameters of all solid photonic crystal fiber with single core or two-core that can achieve nearly-zero flattened dispersion are found through a large number of calculation and simulation, and we look forward to the next step of work plan.