High-precision long-haul fiber-optic time transfer between multi stations

doi:10.7498/aps.66.200701

	High-precision long-haul fiber-optic time transfer between multi stations
	Chen Fa-Xi 1,3; Zhao Kan 1,3; Zhou Xu 1,2,3; Liu Tao 1,3; Zhang Shou-Gang 1,3
刊名	ACTA PHYSICA SINICA
	2017-10-20
卷号	66 期号:20 页码:9
关键词	fiber optics time synchronization synchronization network
ISSN号	1000-3290
DOI	10.7498/aps.66.200701
英文摘要	To achieve high-precision fiber-optic time transfer, the method of two-way transmission is usually used. Therefore in this paper we propose to develop a high-precision long-haul fiber-optic time transfer between multi stations by simultaneously transferring the 1 pluse per second signal, time code signal and 10 MHz frequency signal over single fiber with the same wavelength, and adopting the time division multi address (TDMA) as well as the purification and regeneration method at individual station. In this proposal, the equipment at each remote station has its own address, and the equipment at the local station can establish the periodic two-way time transfer with any remote station by using the TDMA method, therefore each remote station is synchronized with the local station. To avoid the superimposed effect of optical noises during propagation in fiber, the optical-electro-optical relay amplifiers are utilized. In the meantime the propagation delay of the fiber link is compensated for at each remote station. With the self-developed engineering prototypes, the experimental verifications are subsequently conducted both in laboratory and real field. In the laboratory, the experimental setup is built by cascading 11 rolls of 50 km-long fiber coils, and locating three monitoring devices at different fiber distances of 50, 300, and 550 km from the local station. The stabilities of the time transfer at these three points are achieved to be 16.7, 16.8, and 18.4 ps in standard deviation, and the time deviations are 1.78, 2.09, and 2.92 ps at an averaging time of 1000 s respectively. In the real field test, a field fiber link of 871.6 km in length is utilized, along which 11 self-developed time-frequency transceivers are set at the cascaded fiber-optic stations. Since only the 11th remote station is co-located at the local station, the performance and the time transfer between the 11th remote station and the local station are measured accurately. The time transfer is experimentally demonstrated with the time standard deviation of 29.8 ps and the time deviations of 3.85 ps/1000 s. The timing uncertainty on the field fiber link is also checked and gives a value of 25.4 ps. To further improve the long-term stability of time transfer, the more accurate thermal control of the lasers used in the system should be adopted to reduce the optical wavelength drift. By compressing the bandwidth of the phase locked loop module in each remote device, the short-term stability of time synchronization can also be better. This proposal can also be extended to the fiber networks with star-shaped and chain-shaped connections. Therefore time synchronization in even larger areas and more stations can be realized.
资助项目	National Natural Science Foundation of China[91636101] ; National Natural Science Foundation of China[11273024] ; National Key Research and Development Plan of China[2016YFF0200200]
WOS关键词	FREQUENCY ; ACCURACY ; CLOCKS ; GPS
WOS研究方向	Physics
语种	英语
出版者	CHINESE PHYSICAL SOC
WOS记录号	WOS:000427640500001
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Plan of China ; National Key Research and Development Plan of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Plan of China ; National Key Research and Development Plan of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Plan of China ; National Key Research and Development Plan of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Plan of China ; National Key Research and Development Plan of China
内容类型	期刊论文
源URL	[http://210.72.145.45/handle/361003/11540]
专题	中国科学院国家授时中心
通讯作者	Chen Fa-Xi
作者单位	1.Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Shaanxi, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100039, Peoples R China 3.Chinese Acad Sci, Key Lab Time & Frequency Stand, Xian 710600, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Chen Fa-Xi,Zhao Kan,Zhou Xu,et al. High-precision long-haul fiber-optic time transfer between multi stations[J]. ACTA PHYSICA SINICA,2017,66(20):9.
APA	Chen Fa-Xi,Zhao Kan,Zhou Xu,Liu Tao,&Zhang Shou-Gang.(2017).High-precision long-haul fiber-optic time transfer between multi stations.ACTA PHYSICA SINICA,66(20),9.
MLA	Chen Fa-Xi,et al."High-precision long-haul fiber-optic time transfer between multi stations".ACTA PHYSICA SINICA 66.20(2017):9.