Robust Transfer of Optical Frequency over 500km Fiber Link with Instability of 10^(−21)  

作　　者：Qian Zhou Xiang Zhang Qi Zang Mengfan Wu Dan Wang Jie Liu Ruifang Dong Tao Liu Shougang Zhang 周茜;张翔;臧琦;吴梦凡;王丹;刘杰;董瑞芳;刘涛;张首刚(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Time and Frequency Standards,Chinese Academy of Sciences,Xi’an 710600,China;Hefei National Laboratory,Hefei 230088,China)

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 100049,China [3]Key Laboratory of Time and Frequency Standards,Chinese Academy of Sciences,Xi’an 710600,China [4]Hefei National Laboratory,Hefei 230088,China

出　　处：《Chinese Physics Letters》2024年第8期22-27,共6页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12303076 and 12303077).

摘　　要：Our primary objective is to mitigate the adverse effects of temperature fluctuations on the optical frequency transmission system by reducing the length of the interferometer.Following optimization,the phase-temperature coefficient of the optical system is reduced to approximately 1.35 fs/K.By applying a sophisticated temperature control to the remained“out-of-loop”optics fiber,the noise floor of the system has been effectively lowered to 10−21 level.Based on this performance-enhanced transfer system,we demonstrate coherent transmission of optical frequency through 500-km spooled fiber link.After being actively compensated,the transfer instability of 4.5×10^(−16) at the averaging time of 1 s and 5.6×10^(−21) at 10000 s is demonstrated.The frequency uncertainty of received light at remote site relative to that of the origin light at local site is achieved to be 1.15×10^(−19).This enhanced system configuration is particularly well suited for future long-distance frequency transmission and comparison of the most advanced optical clock signals.

关 键 词：FIBER INTERFEROMETER system 

分 类 号：TN253[电子电信—物理电子学]