Report on 3,143.6-km Time and Frequency Transfer Fiber Link with Ps-level Stability  

作　　者：Bo Liu Xinxing Guo Jiang Chen Yanli Zhou Tao Liu Ruifang Dong Shougang Zhang 

机构地区：[1]National Time Service Center,Chinese Academy of Sciences,Xi'an 710600,China [2]University of Chinese Academy of Sciences,Beijing 100039,China [3]Key Laboratory of Time Reference and Applications,Chinese Academy of Sciences,Xi'an 710600,China [4]China Mobile Communications Group Shaanxi Co.,Ltd,Xi'an 710600,China

出　　处：《Chinese Physics Letters》2025年第1期68-72,共5页中国物理快报(英文版)

摘　　要：This letter describes the implementation of a high-precision time and frequency transmission system using a two-way and wavelength division multiplexing scheme over 3,143.6 km of field fiber links,connecting 21 sites between Xi’an and Beijing,China.This scheme incorporates a link noise clean-up system(LNCUS),wherein a controlled very-low-phase noise BVA oscillator acts as an internal frequency source at the relay site to effectively suppress the interference caused by the fiber link noise.Additionally,the high-stability pulse generation technology in the LNCPS provides sufficient short-term stability to significantly improve the stability of the fiber time transfer.The results indicate a time transfer stability in terms of time deviation(TDEV)of less than2.07 ps@1s,5.9 ps@100,000s,and combined uncertainty of less than 49.29 ps for the 3,143.6 km field fiber link.The results represent a significant breakthrough in achieving high-accuracy time transfer and continuous operation over ultralong-span field optical fibers exceeding 3,000 km for the first time.This enabled time transfer and synchronization services over the longest international optical fiber distance,thereby establishing a fundamental basis for constructing a nationwide high-precision time service through optical fiber networks.

关 键 词：FIBER BREAKTHROUGH EXCEEDING 

分 类 号：TN929.11[电子电信—通信与信息系统]