Abstract
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 and 65% at a wavelength of is calculated. Simultaneously, the wavelength bandwidth is around . 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.
© 2011 Optical Society of America
Full Article | PDF ArticleMore Like This
Junbo Yang, Zhiping Zhou, XinJun Wang, Danhua Wu, Huaxiang Yi, JianKun Yang, and Wei Zhou
Opt. Lett. 36(6) 837-839 (2011)
Jinbin Xu, Sipan Yang, Liying Wu, Liping Xu, Yaqian Li, Rujun Liao, Minni Qu, Xueling Quan, and Xiulan Cheng
Opt. Express 29(26) 42999-43010 (2021)
Junbo Feng and Zhiping Zhou
Opt. Lett. 32(12) 1662-1664 (2007)