基于区域分裂法（DDM ）结合频域有限差分（FDFD）和波导模式展开求解矩形波导不连续性问题。
The Domain Decomposition Method(DDM) in conjunction with FDFD and Modes Expansion was used to analyze the discontinuity of the rectangular recangular waveguide.
采用有限差分波束传输法（FD-BPM）设计了一种66%模式转换、合并器。
The finite difference beam propagation method(FD-BPM)is used to design a device of 66% MMI-converter-Combiners.
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