平板波导芯层的折射率为n1, 敷层的折射率为n2，衬底的折射率为n3,则A、n1＞n2 n1＞n3B、n1＜n2 n1＜n3C、n1＞n2 n1＜n3D、n1＜n2 n1＞n3

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平板波导芯层的折射率为n1, 敷层的折射率为n2，衬底的折射率为n3,则
A、n1＞n2 n1＞n3
B、n1＜n2 n1＜n3
C、n1＞n2 n1＜n3
D、n1＜n2 n1＞n3

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