To analyze common plane wave-guides and graded-index wave-guides, the two-dimensional scalar FD-TD method is required. To analyze complicatedwave-guides, the vector FD-TD method is compulsory When the vector FD-TD methodis used, half steps of the meshes appear.
所以分析一般的平面波导和渐变折射率波导时只需用二维标量FD-TD法就可以满足要求，而对于结构复杂的波导则必须采用矢量FD-TD法才能达到精度要求。
参考来源 - 光波导计算中的时域有限差分法·2,447,543篇论文数据，部分数据来源于NoteExpress
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