Precise and continuous time and frequency synchronisation at the 5×10⁻¹⁹ accuracy level.
Precise and continuous time and frequency synchronisation at the 5×10⁻¹⁹ accuracy level.
复制标题
DOI：
10.1038/srep00556
复制
发表时间：
2012
影响因子：
4.6
通讯作者：
Wang, L. J.
中科院分区：
文献类型：
--
作者：
Wang, B.;Gao, C.;Chen, W. L.;Miao, J.;Zhu, X.;Bai, Y.;Zhang, J. W.;Feng, Y. Y.;Li, T. C.;Wang, L. J.
远程位置之间的时间和频率同步对于许多重要应用至关重要。传统的时间和频率传播通常利用卫星链路。近年来，通信光纤网络已成为长距离时间和频率传播的有吸引力的选择。在这里，我们通过清华大学 (THU) 和中国国家计量研究院 (NIM) 之间的 80 公里光纤链路演示了精确的频率传输和时间同步。使用 9.1 GHz 微波调制和由两个连续波激光器承载并在同一条 80 km 城市光纤链路上传输的定时信号，实现了 5×10−19/天水平的频率传输稳定性。还演示了 50 ps 精度水平的时间同步。系统运行可靠，已连续运行数月。我们进一步讨论了使用这种频率和时间传输超过1000公里的可行性及其在长基线射电天文学中的应用。
The synchronisation of time and frequency between remote locations is crucial for many important applications. Conventional time and frequency dissemination often makes use of satellite links. Recently, the communication fibre network has become an attractive option for long-distance time and frequency dissemination. Here, we demonstrate accurate frequency transfer and time synchronisation via an 80 km fibre link between Tsinghua University (THU) and the National Institute of Metrology of China (NIM). Using a 9.1 GHz microwave modulation and a timing signal carried by two continuous-wave lasers and transferred across the same 80 km urban fibre link, frequency transfer stability at the level of 5×10−19/day was achieved. Time synchronisation at the 50 ps precision level was also demonstrated. The system is reliable and has operated continuously for several months. We further discuss the feasibility of using such frequency and time transfer over 1000 km and its applications to long-baseline radio astronomy.
登录
查看更多内容
影响因子：
2.6
作者：
Hsu, Magnus T. L.;He, Yabai;Gray, Malcolm B.
通讯作者：
Gray, Malcolm B.
影响因子：
5.6
作者：
Jefferts, SR;Weiss, MA;Parker, TE
通讯作者：
Parker, TE
影响因子：
3.6
作者：
Grosche, G.;Terra, O.;Schnatz, H.
通讯作者：
Schnatz, H.
影响因子：
2.4
作者：
Bauch, A;Achkar, J;Uhrich, P
通讯作者：
Uhrich, P
影响因子：
8.6
作者：
Foreman, Seth M.;Ludlow, Andrew D.;Ye, Jun
通讯作者：
Ye, Jun