The finite difference beam propagation method(FD-BPM) can simulate the performance of the waveguide accurately.

有限差分束传播法则能够准确地模拟波导的性能。

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The finite difference beam propagation method(FD-BPM)is used to design a device of 66% MMI-converter-Combiners.

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。

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Variational-Effective index method and Finite difference beam propagation method(FD-BPM) are both practicable waveguide simulation tools.

在众多的波导模拟工具中变分有效折射率法和有限差分束传播法都是实用性非常强的。

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