科研之友
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摘要
This letter presents methods for determining the parameters of the three different approximate solutions for the fundamental mode field distribution of Ti:LiNbO3 optical waveguides by using the variational technique. This analysis gives closer approximation not only to the field distribution, but also to the propagation constant. Comparison with the exact results for the exponential index distribution in depth shows that these trial functions are closer to the real solution. It is also shown that these solutions are as accurate as the effective index method for Ti:LiNbO3 stripe waveguides. The analysis provides an approach for comparing and assessing these solutions.
