Shi L P, Pun E Y, Chung P S
Opt Lett. 1995 Aug 1;20(15):1622-4. doi: 10.1364/ol.20.001622.
A simple method is outlined for the calculation of the refractive-index profiles of both multimode and monomode planar optical waveguides. The method is an extension of the well-established IWKB method. The parameters required are the dispersion relation of the surface index changes and the effective indices at different wavelengths. As an example, the refractive-index profile of a monomode z-cut KTiOPO(4) planar waveguide fabricated by Rb(+):K(+) exchange is computed. Close agreement is obtained, indicating the practicality of this method. The method is also applicable to optical waveguides in other materials, such as LiNbO(3), LiTaO(3), and glass.
本文概述了一种计算多模和单模平面光波导折射率分布的简单方法。该方法是对已成熟的IWKB方法的扩展。所需参数为表面折射率变化的色散关系以及不同波长下的有效折射率。作为示例，计算了通过Rb(+)：K(+)交换制备的单模z切割KTiOPO(4)平面光波导的折射率分布。结果获得了很好的一致性，表明该方法具有实用性。该方法也适用于其他材料中的光波导，如LiNbO(3)、LiTaO(3)和玻璃。
