Department of Electronic Engineering, The Chinese University of Hong Kong, NT, Hong Kong, China.
Opt Lett. 2011 Mar 15;36(6):796-8. doi: 10.1364/OL.36.000796.
We propose the use of subwavelength structures in a waveguide grating to achieve polarization-independent coupling of light between an optical fiber and a silicon-on-insulator (SOI) optical waveguide. The subwavelength structure allows the mode effective indices of the TE and TM modes in the grating section to be precisely engineered. We calculate that coupling efficiency of over 64% is possible using the proposed design for polarization-independent coupling between single-mode optical fibers and SOI nanophotonic waveguides.
我们提出在波导光栅中使用亚波长结构来实现光纤和绝缘体上硅（SOI）光波导之间的偏振无关光耦合。亚波长结构允许精确设计光栅部分中的 TE 和 TM 模式的有效折射率。我们计算出，使用所提出的设计，对于单模光纤和 SOI 纳米光子波导之间的偏振无关耦合，耦合效率超过 64%是可能的。
