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An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers

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9 Author(s)
Taillaert, D. ; Dept. of Inf. Technol., Ghent Univ., Belgium ; Bogaerts, W. ; Bienstman, P. ; Krauss, T.F.
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We have designed and fabricated an out-of-plane coupler for butt-coupling from fiber to compact planar waveguides. The coupler is based on a short second-order grating or photonic crystal, etched in a waveguide with a low-index oxide cladding. The coupler is optimized using mode expansion-based simulations. Simulations using a 2-D model show that up to 74% coupling efficiency between single-mode fiber and a 240-nm-thick GaAs-AlOx waveguide is possible. We have measured 19% coupling efficiency on test structures

Published in:

Quantum Electronics, IEEE Journal of  (Volume:38 ,  Issue: 7 )

Date of Publication:

Jul 2002

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