University of Electronic Science and Technology of China 1.平板光波导的几何光学分析 1956 图2-1.平板光波导的基本结构 n1>n2 对称型 n1>n3 Symmetric type n2=n3 n3 •非对称型 ni •Asymmetric type n2 n2≠n3 Substrate 3University of Electronic Science and Technology of China 3 x y z Substrate n2 n1 n3 n1>n2 n1>n3 1. 平板光波导的几何光学分析 图2-1.平板光波导的基本结构 •对称型 •Symmetric type n2 = n3 n2  n3 •非对称型 •Asymmetric type