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Compact and Highly Efficient Grating Couplers Between Optical Fiber and Nanophotonic Waveguides

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8 Author(s)
Frederik Van Laere ; Interuniv. Microelectron. Center, Ghent Univ. ; Gnther Roelkens ; Melanie Ayre ; Jonathan Schrauwen
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We present high-efficiency grating couplers for coupling between a single-mode fiber and nanophotonic waveguides, fabricated both in silicon-on-insulator (SOI) and InP membranes using BenzoCycloButene wafer bonding. The coupling efficiency is substantially increased by adding a gold bottom mirror to the structures. The measured coupling efficiency to fiber is 69% for SOI grating couplers and 56% for bonded InP membrane grating couplers

Published in:

Journal of Lightwave Technology  (Volume:25 ,  Issue: 1 )