国家授时中心长距离光纤光学频率传递研究进展  

Progress of fiber-based optical frequency transfer in NTSC

作　　者：刘杰[1,2] 邓雪[1,2] 张翔[1,2,3] 臧琦 王丹[1,2,3] 焦东东[1,2] 高静 王东杰 周茜[1,2,3] 刘涛[1,2,3] 张首刚[1,2,3] LIU Jie;DENG Xue;ZHANG Xiang;ZANG Qi;WANG Dan;JIAO Dong-dong;GAO Jing;WANG Dong-jie;ZHOU Qian;LIU Tao;ZHANG Shou-gang(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;Key Laboratory of Time and Frequency Primary Standards,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院时间频率基准重点实验室,西安710600 [3]中国科学院大学,北京100049

出　　处：《时间频率学报》2021年第4期231-243,共13页Journal of Time and Frequency

基　　金：国家自然科学基金资助项目(91636101,91836301,11803041)。

摘　　要：光纤光学频率传递是新一代时间频率体系和地基授时系统的重要组成部分,利用光纤实现高精度光学频率传递具有明显的精度优势和应用前景。本文报道了中国科学院国家授时中心在高精度光纤光学频率传递方面的研究进展。112 km实地光纤上国内首次实现万秒稳定度7.5×10^(-20)的光频传递;利用光外差锁相方案实现了光频级联传递技术突破,在224 km实地光纤上光频传递稳定度万秒稳定度7.7×10^(-19);首次提出并验证了一种基于本地测量的光纤光频双向比对,50 km频率比对稳定度秒稳达到1.2×10^(-16),4万秒稳定度达到1.3×10^(-21)。最新进展为在860 km实地光纤上实现了稳定度2×10^(-19)@200 s的光频传递。Fiber-based optical frequency transfer is an important part of the new generation of TimeFrequency System and the Ground-based Time Service System,and has shown the advantage of high precision and a potential for the future application.In this paper,we reported the new results of the fiber-based optical frequency transfer in NTSC.For the first time in China,the optical frequency transfer over a 110-kilometer-long urban fiber showed an instability of 7.5×10^(-20)at a 10 ks average time.By using the heterodyne optical phase locking as the optical regeneration,we demonstrated an optical frequency transfer of the two-stage cascade link comprising two 112 km-long links,with an instability of 7.7×10^(-19)at 10 ks.We demonstrated an improved local two-way optical phase comparison method without the requirement of synchronization,and implemented a real-time frequency comparison over a bi-directional 50-km fiber spool,with the relative frequency stability being 1.2×10^(-16)at 1 s and 1.3×10^(-21)at 40 ks.Recently,another optical frequency transfer link was implemented,and the 880 km link showed a transfer instability of 2×10^(-19)at 200 s.

关 键 词：光学频率传递 时间频率标准 光纤网络 光纤授时系统 

分 类 号：TH714[机械工程—测试计量技术及仪器] TN253[机械工程—仪器科学与技术]