Polarization diversity two-dimensional grating coupler on x-cut lithium niobate on insulator

• DOI: 10.3788/col202119.060006
• Publication Date: 2021-04-28T06:55:49Z
• Authors: Renyou Ge; Hao Li; Ya Han; Lifeng Chen; Jian Xu; Meiyan Wu; Yongqing Li; Yannong Luo; Xinlun Cai
• Keywords: 0103 physical sciences; 01 natural sciences; 7. Clean energy

We propose and demonstrate a polarization diversity two-dimensional grating coupler based on the lithium niobate insulator platform, for first time, to best of our knowledge. The optimization design, performance characteristics, fabrication tolerance are thoroughly analyzed utilizing three-dimensional finite-difference time-domain method. Experimentally, -7.2 dB coupling efficiency is achieved with 1 bandwidth 64 nm. polarization-dependent loss about 0.4 around 1550 Our work provides new multiplexing approaches paving way critical applications such as high-speed multiplexed electro-optical modulators.