Journal
OPTICS EXPRESS
Volume 22, Issue 15, Pages 18224-18231Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.018224
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC) under the Silicon Electronic-Photonic Integrated Circuits (Si-EPIC) CREATE program
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We report on the design and characterization of focusing-curved subwavelength grating couplers for ultra-broadband silicon photonics optical interfaces. With implementation of waveguide dispersion engineered subwavelength structures, an ultra-wide 1-dB bandwidth of over 100 nm (largest reported to date) near 1550 nm is experimentally achieved for transverse-electric polarized light. By tapering the subwavelength structures, back reflection is effectively suppressed and grating coupling efficiency is increased to -4.7 dB. A compact device footprint of 40 mu m x 20 mu m is realized by curving the gratings in a focusing scheme. (C) 2014 Optical Society of America
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