Measurement Of Refractive Index Profiles Of Preforms And Wavegui Des By Means Of Higher-Order Approximation And Interference With Plane Wave Of Reference

Waldemar Kowalik; Boguslawa Dubik

doi:10.1117/12.952960

30 January 1990 Measurement Of Refractive Index Profiles Of Preforms And Waveguides By Means Of Higher-Order Approximation And Interference With Plane Wave Of Reference

Waldemar Kowalik, Boguslawa Dubik

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Proceedings Volume 1085, Optical Fibres and Their Applications V; (1990) https://doi.org/10.1117/12.952960
Event: Optical Fibers and Their Applications V, 1989, Warsaw, Poland

Abstract

There are described the methods of wave front reconstruction by means of optical path difference fringe shift method, interfringe linear interpolation, and polynomial approximation. By way of example, the results of measurements of refractive index profiles for waveguide preforms are given. These results were obtained using higher order approximation methods (of the first and second orders). The method in question, together with computer programs that have been worked out, also permits correction of errors caused by discontinuity of refractive index profile, mismatching of the immersion liquid refractive index to preform clad or waveguide, as well as by core ellipticity (partial correction). The measuring accuracy of 0.1 per cent was obtained.

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Waldemar Kowalik and Boguslawa Dubik "Measurement Of Refractive Index Profiles Of Preforms And Waveguides By Means Of Higher-Order Approximation And Interference With Plane Wave Of Reference", Proc. SPIE 1085, Optical Fibres and Their Applications V, (30 January 1990); https://doi.org/10.1117/12.952960

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