Abstract

We propose and experimentally demonstrate a novel subwavelength grating coupler on silicon-on-insulator, for coupling to optical fibers with a wide optical bandwidth. Theoretical analysis and design optimization of the coupler are described. About 73 nm 1 dB bandwidth was experimentally demonstrated with $-5.6\mathrm{dB}$ coupling efficiency. Better than $-3.4\mathrm{dB}$ efficiency with 86 nm 1 dB bandwidth is predicted for these structures with optimized buried oxide thickness.

© 2012 Optical Society of America

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