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

• 作者: Renyou Ge Hao Li Ya Han Lifeng Chen Jian Xu Meiyan Wu Yongqing Li Yannong Luo Xinlun Cai
• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: Special Issue on Lithium Niobate Based Photonic Devices
• 页码范围: 23-27
• 页数: 5页
• 语种: 英文
• DOI: 10.3788/COL202119.060006

摘要

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 polari-zation multiplexed electro-optical modulators.