Two-dimensional Fdtd Simulation Of Integrated Optical Waveguide And Sub-domain Synthesis

Integrated Optics has developed fast these years. It is been applied in various areas other than the traditional optical communication. The integrated optical apparatus act as a whole part while it's performance being due to the configuration of the optical waveguide. Because of the high cost when producing a few pieces with complicated technics and various parameters, it is not practicable and worthy to find the optimal parameters by testing a real piece so that we must simulate by software at first and optimize those parameters. The way of software simulation is presented including algorithm and modeling affairs.Finite-Difference Time-Domain Method is one of the most developed numerical method in the EM field calculation area. It's been widely implemented in the research of EM radiation, dispersion, antenna, microwave&millimeterwave and photoelectron, etc. In this article the FDTD thesis is introduced, including modeling, absorbing boundary conditions and the setting of source in simulating. 2D-FDTD programme in FORTRAN has been composed to simulate the electric field distribution for the spot source, parallel-slab directional coupler and bended waveguide.A new 'FDTD Subdomains-Synthesized Method' is presented and applied in the simulation of those models mentioned above. By this method.The unique-shaped object (exp. Bended waveguide) is covered by a series of rectangular 'subdomain' and thus form a polygon FDTD district. It is shown that this method can effectively reduce the memory and time using.