Chinese Optics Letters, 2021, 19 (6): 060006, Published Online: Apr. 12, 2021
Polarization diversity two-dimensional grating coupler on x-cut lithium niobate on insulator Download: 775次
Abstract
We propose and demonstrate a polarization diversity two-dimensional grating coupler based on the lithium niobate on insulator platform, for the first time, to the best of our knowledge. The optimization design, performance characteristics, and fabrication tolerance of the two-dimensional grating coupler are thoroughly analyzed utilizing the three-dimensional finite-difference time-domain method. Experimentally, of coupling efficiency is achieved with 1 dB bandwidth of 64 nm. The polarization-dependent loss is about 0.4 dB around 1550 nm. Our work provides new polarization multiplexing approaches for the lithium niobate on insulator platform, paving the way for critical applications such as high-speed polarization multiplexed electro-optical modulators.
Renyou Ge, Hao Li, Ya Han, Lifeng Chen, Jian Xu, Meiyan Wu, Yongqing Li, Yannong Luo, Xinlun Cai. Polarization diversity two-dimensional grating coupler on x-cut lithium niobate on insulator[J]. Chinese Optics Letters, 2021, 19(6): 060006.