Abstract
We propose and demonstrate a compact and efficient grating coupler for first-order mode fiber-to-chip coupling. The coupler is configured by a double-part grating structure combined with a curved Y-junction by means of mode diversity. Compared with a traditional grating coupler, the designed structure takes advantage of minimizing the taper lengths of gratings, while performing higher coupling efficiency and lower crosstalk. At a mere 20 μm taper length, we measured a peak coupling efficiency of with a 1 dB bandwidth of 35 nm. The coupling performance for the fundamental mode is also investigated. A reduced crosstalk below within the whole band with reasonable coupling efficiency can be experimentally observed.
© 2018 Optical Society of America
Full Article | PDF ArticleMore Like This
Yaxiao Lai, Yu Yu, Songnian Fu, Jing Xu, Perry Ping Shum, and Xinliang Zhang
Opt. Lett. 42(18) 3702-3705 (2017)
Wen Zhou, Zhenzhou Cheng, Xiankai Sun, and Hon Ki Tsang
Opt. Lett. 43(12) 2985-2988 (2018)
Purnima Sethi, Rakshitha Kallega, Anubhab Haldar, and Shankar Kumar Selvaraja
Opt. Lett. 43(14) 3433-3436 (2018)