Title :
Embedded slanted grating for vertical coupling between fibers and silicon-on-insulator planar waveguides
Author :
Wang, Bin ; Jiang, Jianhua ; Nordin, Gregory P.
Author_Institution :
Nano & Micro Devices Center, Univ. of Alabama in Huntsville, AL, USA
Abstract :
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.
Keywords :
diffraction gratings; finite difference time-domain analysis; genetic algorithms; optical design techniques; optical fibre couplers; optical planar waveguides; silicon-on-insulator; 240 nm; Si; coupling efficiency; embedded grating; grating coupler; grating design; high-index waveguide core; microgenetic algorithm; optical fibers; parallelogram-shaped grating; planar waveguides; silicon-on-insulator; single-mode fiber; slanted grating; two-dimensional finite-difference time-domain method; vertical coupling; Etching; Fiber gratings; Optical coupling; Optical fiber couplers; Optical fibers; Optical planar waveguides; Optical waveguides; Planar waveguides; Shape; Silicon on insulator technology; Gratings; integrated optics; optical fiber coupling; waveguide components;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2005.853236
