对称平板波导辐射模的自由空间模近似及应用

应用科学学报 ›› 1999, Vol. 17 ›› Issue (2): 194-198.

对称平板波导辐射模的自由空间模近似及应用

王子华, 李明生

上海大学

收稿日期:1997-11-21 修回日期:1998-04-08 出版日期:1999-06-30 发布日期:1999-06-30

Free Space Mode Approximation for Radiation Modes of a Slab Waveguide and Its Application

WANG ZIHUA, LI MINGSHENG

Shanghai university, Shanghai 201800

Received:1997-11-21 Revised:1998-04-08 Online:1999-06-30 Published:1999-06-30

摘要/Abstract

摘要： 以对称平板波导为例,说明弱导引的平面光波导辐射模可以用自由空间模近似表示,其场表达式以及归一化常数变得十分简单、直观,不必通过计算而可以直接写出.应用这一近似,平板波导界面随机的畸变所引起辐射场的远场分布以及辐射损耗的计算可以大大简化.

关键词: 平板波导, 辐射模

Abstract: Taking the symmetric slab waveguide as an example,we show that radiation modes of a weakly guiding planar optical waveguide can be approximated by the free space modes,their field expression and normalization constants are simple and understandable physically and can be obtained directly without any calculation.By applying this approximation,the far field and radiation loss calculations caused by random wall imperfections have been significantly simplified.

Key words: slab waveguide, radiation modes

王子华, 李明生. 对称平板波导辐射模的自由空间模近似及应用[J]. 应用科学学报, 1999, 17(2): 194-198.

WANG ZIHUA, LI MINGSHENG. Free Space Mode Approximation for Radiation Modes of a Slab Waveguide and Its Application[J]. Journal of Applied Sciences, 1999, 17(2): 194-198.