Ti：LiNbO3光波导导模的场分布

给出了Ti扩散LiNbO_3条波导任意阶导模场分布的试探解.通过变分法分析,不但可以合理地确定其中的待定参数,而且也得到了相应导模传播常数的近似值.与扩展的有效折射率方法比较:这种解不但在函数形式上简单,待定常数确定方便,而且具有精度高的优点.还可以得到等效一维波导折射率分布的解析表达式.

Guided mode field distributions of Ti : LiNbO_3 optical waveguides

This paper presents a trial solution for the predominant field distribution of an arbitrary order guided mode of Ti : LiNbO3 optical waveguides. The parameters of the solution can be reasonably determined by using the variational technique. And the propagation constant can be approximately obtained simultaneously. Compared with the extended effective index method and the effective index method, the main advantage besides its high accuracy and simplisity in methematical style is that the unknown parameters are easy to be determined. Also, we can obtain the analytical expression of the refractive index profile of the equivalent slab waveguide.