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Embedded slanted grating for vertical coupling between fibers and silicon-on-insulator planar waveguides

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3 Author(s)
Bin Wang ; Nano & Micro Devices Center, Univ. of Alabama in Huntsville, AL, USA ; Jiang, J. ; Nordin, G.P.

We propose a compact and efficient grating coupler for vertical coupling between optical fibers and planar waveguides. A grating with a parallelogram shape is designed to be etched through the entire high-index waveguide core. The coupler is optimized using a microgenetic algorithm coupled with a two-dimensional finite-difference time-domain method. Simulations show that up to 75.8% coupling efficiency can be obtained between a single-mode fiber and a 240-nm-thick silicon-on-insulator planar waveguide.

Published in:

Photonics Technology Letters, IEEE  (Volume:17 ,  Issue: 9 )

Date of Publication:

Sept. 2005

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