Four-stage cascaded variable optical attenuator with large attenuation range for quantum key distribution  

作　　者：刘清海 潘盼 游金 张家顺 汪亚 王玉婷 王亮亮 安俊明 崔大健 周浪 陈伟 Qing-Hai Liu;Pan Pan;Jin You;Jia-Shun Zhang;Ya Wang;Yu-Ting Wang;Liang-Liang Wang;Jun-Ming An;Da-Jian Cui;Lang Zhou;Wei Chen(School of Electronic Engineering and Intelligent Manufacturing,Anqing Normal University,Anqing 246133,China;State Key Laboratory of Integrated Optoelectronics,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China;College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Chongqing Key Laboratory of Core Optoelectronic Devices for Quantum Communication,Chongqing 400060,China)

机构地区：[1]School of Electronic Engineering and Intelligent Manufacturing,Anqing Normal University,Anqing 246133,China [2]State Key Laboratory of Integrated Optoelectronics,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China [3]College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China [4]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [5]Chongqing Key Laboratory of Core Optoelectronic Devices for Quantum Communication,Chongqing 400060,China

出　　处：《Chinese Physics B》2023年第5期457-461,共5页中国物理B（英文版）

基　　金：the National Key Research and Development Program of China(Grant No.2019YFB2203504);Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB43000000);the Natural Science Foundation of Anhui Province,China(Grant No.1908085QF274)。

摘　　要：A four-stage cascaded variable optical attenuator(VOA)with a large attenuation range is presented.The VOA is based on a Mach–Zehnder interferometer(MZI)and fabricated in a silica-based planar lightwave circuit(PLC)platform.The thermo-optic effect is used to achieve intensity modulation.The measured maximum attenuation of the four-stage cascaded VOA is 88.38 d B.The chip is also tested in a quantum key distribution(QKD)system to generate signal and decoy states.The mean photon number after attenuation of the four-stage cascaded VOA is less than 0.1,which can meet the requirement of QKD.

关 键 词：variable optical attenuator(VOA) SILICA large attenuation range thermo-optic effect 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理] TN715[电子电信—通信与信息系统]