期刊
OPTICS LETTERS
卷 37, 期 17, 页码 3663-3665出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.37.003663
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- Spanish Ministry of Science [TEC2009-10152]
- Andalusian Regional Ministry of Science, Innovation and Business [P07-TIC-02946]
- European Mirthe project [FP7-2010-257980]
Grating couplers are a promising approach to implement efficient fiber-chip coupling. However, their strong polarization dependence makes dual-polarization operation challenging. In this Letter we propose, for the first time, a polarization-independent grating coupler for thick rib silicon-on-insulator (SOI) waveguides. Coupling efficiency is optimized by designing the grating pitch and duty cycle, without varying the bottom oxide thickness, which significantly simplifies practical implementation. Directivity of the grating coupler is enhanced by a high reflectivity layer under the bottom oxide after the selective removal of the Si substrate. Dual-polarization coupling efficiency of -2.8 dB is shown. (c) 2012 Optical Society of America
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