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Fabry–Perot method for the characterization of integrated optical directional couplers

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Abstract

A method to measure the loss and the power-transfer ratio of directional couplers is presented. It is based on the Fabry–Perot resonances from end-facet reflections. The dependence of the accuracy of the measurements on the facet tilts is described. For low facet misalignments, an uncertainty <0.3 dB in the loss measurements and power-transfer-ratio measurement errors <1% are obtained. For arbitrary facet tilts the errors depend on the extinction ratios. Experimental measurements are reported to verify the method, and its application to multimode interference couplers is shown.

© 1995 Optical Society of America

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