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A Rigorous 2D Approximation Technique for 3D Waveguide Structures for BPM Calculations
한영탁,신장욱,김덕준,성희경,Sang-HoPark,Yoon-JungPark 한국전자통신연구원 2003 ETRI Journal Vol.25 No.6
We propose a rigorous 2D approximation technique for the 3D waveguide structures; it can minimize the well-known approximation errors of the commonly used effective index method. The main concept of the proposed technique is to compensate for the effective cladding index in the equivalent slab model of the original channel waveguide from the modal effective index calculated by the nonuniform 2D finite difference method. With simulations, we used the proposed technique to calculate the coupling characteristics of a directional coupler by the 2D beam propagation method, and the results were almost exactly the same as the results calculated by the 3D beam propagation method.