计算了脊的尺寸变化时的截止波长和单模带宽，给出了主模场结构图以及变形对截止波长和单模带宽影响的关系曲线，并分析了传输特性随对称脊波导结构尺寸变化的情况。

It calculates the cutoff wavelength and single-mode bandwidth at the change of the ridge dimensions, gives the dominant mode field pattern and the corresponding curve of the deformation vs.

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