期刊
OPTICS LETTERS
卷 34, 期 9, 页码 1408-1410出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.34.001408
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资金
- National Research Council of Canada (NRC)
- Genomics and Health Initiative
- Spanish Ministerio de Ciencia e Innovacion [TEC2006-02868]
- Formacion del Profesorado Universitario scholarship [AP2006-03355]
- Andalusian Regional Ministry of Science, Innovation and Business [TIC-02946]
We propose a silicon waveguide-fiber grating coupler that uses a subwavelength microstructure to achieve a continuously variable grating strength yet can be fabricated using only a single etch step. By adjusting the subwavelength microstructure at every point along the grating, the grating coupler can be optimized to give high field overlap with the optical fiber mode and also minimize backreflections along the incident waveguide path. Our design example is optimized for quasi-TM mode in a silicon photonic-wire waveguide, as required for waveguide evanescent-field-sensing applications. A field overlap of up to 94% with a standard single-mode optical fiber (SMF-28) is achieved by coupler apodization. Backreflection from the grating is reduced to similar to 0.1%, and the total predicted photonic wire to fiber coupling efficiency is 50%. (C) 2009 Optical Society of America
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