Finally discussion is on how to optimize sidelobe level of the two sections of difference beam.
最后讨论了对于差波束两个切面旁瓣电平的优化的问题。
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。
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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