期刊
OPTICS LETTERS
卷 36, 期 14, 页码 2614-2616出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.36.002614
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资金
- National Natural Science Foundation of China (NSFC) [60977018, 60907003, 61007047]
- Foundation of the National University of Defense Technology [JC09-02-12]
A high-performance and compact fiber-to-waveguide binary blazed subwavelength grating coupler was designed based on silicon-on-insulator. By the appropriate choice of waveguide/grating parameters, including thicknesses, periods, height, and fill factor, to optimize the mode matching, a relatively high coupling efficiency was obtained for the fiber and waveguide interface. Moreover, perfectly vertical fiber coupling is achieved by using an asymmetric subgrating structure in which a period consists of two subgratings with identical etching height and different widths. Coupling efficiency as high as 69% at a wavelength of 1.52 mu m and 65% at a wavelength of 1.55 mu m is calculated. Simultaneously, the 1 dB wavelength bandwidth is around 80 nm. The coupling efficiency can reach up to 80% or so if Bragg reflector layers are added. Finally, the device layout is simple, feasible, one-step etched, and compatible with standard complementary metal-oxide semiconductor technology processing. (C) 2011 Optical Society of America
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