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IEEE Journal of Lightwave Technology
Volume 18 Number 10, October 2000

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Refractive-Index Profiling of Graded-Index Planar Waveguides from Effective Indexes Measured with Different External Refractive Indexes

Kin Seng Chiang, Member, IEEE, Member, OSA Chi Lai Wong, Sin Yip Cheng and Hau Ping Chan Member, IEEE

Page 1412.

Abstract:

We extend the well-known inverse Wentzel-Kramer-Brillouin (WKB) method for refractive-index profiling of graded-index planar waveguides. We demonstrate, with numerical examples and experimental results, that the refractive-index profile of a graded-index planar waveguide can be calculated from effective indexes measured with different external refractive indexes. With this technique, single-mode and two-mode waveguides can be profiled easily to a good accuracy.

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