Coherent optical frequency transfer via 972-km fiber link  

作　　者：邓雪 张翔 臧琦 焦东东 王丹 刘杰 高静 许冠军 董瑞芳 刘涛 张首刚 Xue Deng;Xiang Zhang;Qi Zang;Dong-Dong Jiao;Dan Wang;Jie Liu;Jing Gao;Guan-Jun Xu;Rui-Fang Dong;Tao Liu;Shou-Gang Zhang(National Time Service Centre,Chinese Academy of Sciences,Xi’an 710600,China;Key Laboratory of Time Reference and Application,Chinese Academy of Sciences,Xi’an 710600,China;School of Communications and Information Engineering and School of Artificial Intelligence,Xi’an University of Posts and Telecommunications,Xi’an 710121,China)

机构地区：[1]National Time Service Centre,Chinese Academy of Sciences,Xi’an 710600,China [2]Key Laboratory of Time Reference and Application,Chinese Academy of Sciences,Xi’an 710600,China [3]School of Communications and Information Engineering and School of Artificial Intelligence,Xi’an University of Posts and Telecommunications,Xi’an 710121,Chin

出　　处：《Chinese Physics B》2024年第2期277-282,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.12103059,12033007,12303077,and 12303076);the Fund from the Xi’an Science and Technology Bureau,China(Grant No.E019XK1S04);the Fund from the Youth Innovation Promotion Association of the Chinese Academy of Sciences(Grant No.1188000XGJ).

摘　　要：We demonstrate coherent optical frequency dissemination over a distance of 972 km by cascading two spans where the phase noise is passively compensated for.Instead of employing a phase discriminator and a phase locking loop in the conventional active phase control scheme,the passive phase noise cancellation is realized by feeding double-trip beat-note frequency to the driver of the acoustic optical modulator at the local site.This passive scheme exhibits fine robustness and reliability,making it suitable for long-distance and noisy fiber links.An optical regeneration station is used in the link for signal amplification and cascaded transmission.The phase noise cancellation and transfer instability of the 972-km link is investigated,and transfer instability of 1.1×10^(-19)at 10^(4)s is achieved.This work provides a promising method for realizing optical frequency distribution over thousands of kilometers by using fiber links.

关 键 词：optical frequency transfer fiber link phase noise cancellation 

分 类 号：TN929.1[电子电信—通信与信息系统]