高精度长距离光纤时间传递的研究进展及应用  

Research on high-precision long-distance optical fiber time transfer and its application

作　　者：陈法喜[1,2] 孔维成[1,3] 赵侃 李博[1] 刘博[1,3] 郭新兴 陈国超 张首刚 刘涛[1,3] 董瑞芳 CHEN Fa-xi;KONG Wei-cheng;ZHAO Kan;LI Bo;LIU Bo;GUO Xin-xing;CHEN Guo-chao;ZHANG Shou-gang;LIU Tao;DONG Rui-fang(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;Xidian University,Xi’an 710071,China;School of Astronomy and Space Science,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]西安电子科技大学,西安710071 [3]中国科学院大学天文与空间科学学院,北京100049

出　　处：《时间频率学报》2021年第4期266-278,共13页Journal of Time and Frequency

基　　金：国家自然科学基金资助项目(91636101,91836301,12033007,61801458,12003042);中国科学院战略先导B专项(XDB21030200);中国科学院前沿重点研究资助项目(QYZDB-SW-SLH007);广东省重点领域研发计划(2018B030325001)。

摘　　要：中国科学院国家授时中心已启动建设国家高精度地基授时系统。光纤时间传递分系统作为高精度授时系统的重要组成部分,需要不断针对关键技术问题提出解决方案,从而提升光纤时间同步的准确度与稳定度,以达到构建与国家标准时间偏差优于100 ps的高精度光纤时间同步网络的目标。本文报告了中国科学院国家授时中心在长链路光纤时间传递的研究进展。利用研制的光纤时间同步设备在871.6 km的实地光纤链路上得到了29.8 ps的时间同步标准差,3.85 ps@1 ks的时间稳定度,25.4 ps的不确定度;在此基础上针对后向反射光噪声的关键问题进行技术改进,在总长度为1 085 km的实地光纤链路上实现了色散误差修正功能的双波长光纤时间同步,得到了18 ps的时间同步标准差,5.4 ps@4×10^(4)s的稳定度,63.5 ps的不确定度。The National Time Service Center of the Chinese Academy of Sciences has launched the National High-precision Ground-based Time Service System.As an important part of the Ground-based Time Service System,the fiber-optic time transfer subsystem aims for realizing high-precision time synchronization network with its deviation from the national standard time within 100 ps.This article reports the development progress of the National Time Service Center in long-distance fiber-optic time transfer.Using the self-developed optical fiber time synchronization equipment,the experimental results on an 871.6 km field optical fiber link have shown a time synchronization standard deviation of 29.8 ps,time stability of 3.85 ps at 1 ks,and uncertainty of 25.4 ps.Further utilizing the technique of dual-wavelength fiber time synchronization with dispersion error correction function to suppress the inherent retro-reflected optical noise in the fiber transfer,the time synchronization on the field optical fiber link with a record length of 1 085 km has been implemented.The time synchronization standard deviation achieves 18 ps and the stability is 5.4 ps at 4×10^(4)s,the uncertainty is 63.5 ps.

关 键 词：高精度 长距离 实地光纤 时间传递 

分 类 号：TH714[机械工程—测试计量技术及仪器]