Study On The Dispersion Of Micro-structure Fiber And THz Waveguide

Since the first working sample of micro-structure fibers was reported in 1996, micro-structure fibers have been widely studied by the scientists in the field of special fiber due to its unusual properties, such as endlessly single mode, large mode area, large negative dispersion, flatten dispersion, and so on. Through adjusting the size, shape, and pitch of air holes, the micro-structure fibers can exhibit different dispersion properties. It can be used to designed different fibers for dispersion control and management.A full-vector effective index method is developed to model the properties of micro-structure fibers. Based on the nμmerical results of the effect of structure parameters on dispersion properties, micro-structure fibers with different dispersion properties are designed. Further, the method above is applied on designing THz waveguide, THz waveguides with triangle and square lattice are proposed. The relationship between dispersion properties and structure parameters is discussed in order to design low-dispersion THz waveguide.The main works in this paper are listed below:(1) Building the full-vector effective index model according to the characteristics of micro-structure fiber.(2) Analyzing the dispersion propertied of micro-structure fiber with full-vector effective index method, and getting the relation of structure parameters and dispersion properties;(3) Designing four micro-structure fibers with flatten dispersion , double-zero dispersion , large negative dispersion and DSF according to the relationships between structure parameters and dispersion;(4) Proposing THz waveguides with triangle and square lattice. By analyzing the effect of structure parameters on the dispersion properties, proper structure parameters THz waveguide with low dispersion can be constructed.