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

Author Affiliations
1 State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
2 School of Economics and Commerce, South China University of Technology, Guangzhou 510640, China
3 Laboratory of Biomedical Photonics & Engineering, School of Basic Medical Sciences, Guangxi Medical University, Nanning 530021, China
4 Department of Physics, East Carolina University, Greenville, North Carolina 27858-4353, USA
5 Life Science Institute and Laboratory of Biomedical Photonics & Engineering, Guangxi Medical University, Nanning 530021, China
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, -7.2 dB 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.

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