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Ultracompact low-loss coupler between strip and slot waveguides

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Abstract

We present both theoretical and experimental results of an ultracompact waveguide coupler that is capable of highly efficient coupling of light from strip waveguides to slot waveguides, and vice versa. By optimizing the geometrical parameters, it is possible to achieve extremely low-loss coupling. A coupling efficiency of 97% has been obtained experimentally while keeping the overall size down to the range below 10μm. Further analysis shows that the proposed coupler has relatively high tolerance to fabrication errors and is wavelength insensitive.

© 2009 Optical Society of America

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