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.
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)
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).
