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Published on: July 18, 2015
High-efficiency grating-couplers: demonstration of a new design strategy
Riccardo Marchetti1, Cosimo Lacava2, Ali Khokhar3
1University of Pavia, Department of Electrical Engineering and Computer Science, Pavia, IT27100, Italy.
Abstract:
We present a simple and practical strategy that allows to design high-efficiency grating couplers. The technique is based on the simultaneous apodization of two structural parameters: the grating period and the fill-factor, along with the optimization of the grating coupler etching depth. Considering a 260 nm Si-thick Silicon-on-insulator platform, we numerically demonstrated a coupling efficiency of -0.8 dB (83%), well matching the experimental value of -0.9 dB (81%). Thanks to the optimized design, these results represent the best performance ever reported in the literature for SOI structures without the use of any back-reflector.
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