High modulation efficiency thin-film lithium niobate modulator using a three-mode folded phase shifter[Invited]  

作　　者：Jiacheng Liu Jiangbing Du Wenjia Zhang Ke Xu Zuyuan He 刘嘉程;杜江兵;张文甲;徐科;何祖源(State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Key Laboratory of Navigation and Location Services,Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Department of Electronic and Information Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China)

机构地区：[1]State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Key Laboratory of Navigation and Location Services,Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [2]Department of Electronic and Information Engineering,Harbin Institute of Technology,Shenzhen 518055,China

出　　处：《Chinese Optics Letters》2024年第9期9-14,共6页中国光学快报（英文版）

基　　金：supported by the National Key R&D Program of China(No.2023YFB2905502);the National Natural Science Foundation of China(Nos.62122047 and 61935011).

摘　　要：In this study,we proposed and experimentally demonstrated an electro-optic modulator with a small footprint and high modulation efficiency,achieved through the utilization of a mode-folded phase shifter with lumped electrodes.The threemode phase shifter recycles the light three times with different waveguide modes while leading to a pronounced tightening of the optical field confinement.We experimentally obtained a 3.7-times improvement in the modulation efficiency.A low V_(π)L for thin-film lithium niobate(TFLN)Mach-Zehnder modulators of 1 V·cm is realized with a device footprint of 2.7 mm×0.6 mm(0.5 mm for the phase shifter).Even greater improvements in modulation efficiency can be expected through the incorporation of additional modes.

关 键 词：electro-optic modulator thin-film lithium niobate Mach-Zehnder modulator mode division multiplexing 

分 类 号：TN623[电子电信—电路与系统] TN761