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Measurement of Complex Coupling Coefficients of Directional Coupling by Thermo-Optic Modulation

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Abstract

Directional coupling between two parallel single-mode optical waveguides is the functional principle underlying numerous integrated optical devices, such as modulators [1], filters [2] and sensors [3, 4]. As the coupling efficiency depends critically on the synchronism of wave propagation and on the field overlap of the two guides, tight tolerances apply in waveguide fabrication, and a precise determination of the coupling parameters is essential.

© 1996 Optical Society of America

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