Fit method to determine the refractive index profile of planar surface waveguides

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Published under licence by IOP Publishing Ltd
, , Citation E Acosta et al 1995 Pure Appl. Opt. 4 485 DOI 10.1088/0963-9659/4/5/004

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1 Santiago de Compostela Univ., Spain

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Abstract

We present a fit method, based on the WKB approximation, to find the refractive index profile of a planar graded-index waveguide from the evaluation of the positions of the turning points corresponding to each mode of the waveguide. Results are applied to recover numerically a given Gaussian profile and to determine the profile of a fabricated waveguide.

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