Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 22, Issue 15, Pages 1156-1158Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2010.2051220
Keywords
Gratings; integrated optics; silicon-on-insulator (SOI) technology; waveguide couplers
Funding
- University Grants Committee of Hong Kong Special Administrative Region, China [CUHK-SEG01]
- Innovation and Technology Fund [ITS/041/09]
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We describe a shallow-etched diffractive waveguide grating coupler which achieves efficient coupling between singlemode fiber and a silicon-on-insulator optical waveguide. By the appropriate choice of waveguide/grating thicknesses and varying the coupling strength of the grating coupler via tailoring its fill factor to optimize the mode matching, a coupling loss of only 1.2 dB was obtained for each fiber/silicon waveguide interface. The coupling strength and effective refractive index of grating with different fill factors were also characterized to confirm the design simulations. The back reflection was suppressed by varying the coupling strength, leading to further enhancement of the coupling efficiency.
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