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Design of broadband subwavelength grating couplers with low back reflection

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Abstract

We present a methodology to design broadband grating couplers using one-dimensional subwavelength gratings. Using the presented method, we design subwavelength grating couplers (SWGCs) with 1-dB bandwidths ranging from 50 to 90 nm. Our designed SWGCs have competitive coupling efficiency, as high as 3.8dB for the fundamental TE mode, and state-of-the-art back reflections, as low as 23dB.

© 2015 Optical Society of America

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