Refractive-index profiling of buried planar waveguides by an inverse Wentzel-Kramer-Brillouin method

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)1367-1373
Journal / PublicationJournal of Lightwave Technology
Issue number11
Publication statusPublished - 1 Jun 2008


We propose an inverse Wentzel-Kramer-Brillouin (WKB) method for the construction of the refractive-index profiles of buried graded-index planar waveguides from the measured effective indexes of the guided modes. Our method involves experimental determination of the location of the peak index in the buried profile, measurement of the effective indexes in air, and an index-matching liquid, and application of a searching algorithm to find the best-fit profile through inverting the WKB equations. We present numerical examples and experimental results to demonstrate the performance of the method. © 2008 IEEE.

Research Area(s)

  • Buried waveguide, Graded-index waveguide, Optical planar waveguide, Optical waveguide, Refractive-index measurement, Wentzel-Krame Brillouin (WKB) method