One-dimensional grating coupler on lithium-niobate-on-insulator for high-efficiency and polarization-independent coupling

被引：19
作者：
Chen, Bin [1 ]
Ruan, Ziliang [1 ]
Chen, Kaixuan [2 ]
Liu, Liu [1 ,3 ]
机构：
[1] Zhejiang Univ, Coll Opt Sci & Engn, Int Res Ctr Adv Photon, State Key Lab Modern Opt Instrumentat, Hangzhou 310058, Peoples R China
[2] South China Normal Univ, South China Acad Adv Optoelect, Higher Educ Mega Ctr, Ctr Opt & Electromagnet Res,Guangdong Prov Key Lab, Bldg 5, Guangzhou 510006, Peoples R China
[3] Zhejiang Univ, Intelligent Opt & Photon Res Ctr, Jiaxing Key Lab Photon Sensing & Intelligent Imagi, Jiaxing Res Inst, Jiaxing 314000, Peoples R China
来源：
OPTICS LETTERS | 2023年 / 48卷 / 06期
基金：
中国国家自然科学基金;
关键词：
SILICON;
D O I：
10.1364/OL.481277
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A metal-based one-dimensional grating coupler on an x-cut lithium-niobate-on-insulator wafer structure for a polarization-independent fiber interface is designed and demonstrated. By using a metal-based plasmonic mode, the diffractive angle for the two polarized modes in the lithium niobate ridge waveguide can be tuned to be the same. The polarization dependence of the grating coupler therefore can be effectively reduced. The fabricated device exhibits -3.56-dB and -4.08-dB peak coupling losses per coupler at 1573 nm for the TE and TM modes, respectively. The polarization-dependent losses are less than 0.69 dB in a 44-nm wavelength range. The demonstrated grating coupler can serve as a polarization-independent optical fiber inter-face on lithium-niobate-on-insulator and facilitate on-chip polarization diversity applications. (c) 2023 Optica Publishing Group
引用
收藏
页码：1434 / 1437
页数：4
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