中国物理B ›› 2016, Vol. 25 ›› Issue (1): 14206-014206.doi: 10.1088/1674-1056/25/1/014206

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Joint transfer of time and frequency signals and multi-point synchronization via fiber network

Nan Cheng(程楠), Wei Chen(陈炜), Qin Liu(刘琴), Dan Xu(徐丹), Fei Yang(杨飞), You-Zhen Gui(桂有珍), Hai-Wen Cai(蔡海文)   

  1. 1. Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
    2. Key Laboratory for Quantum Optics, CAS, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 收稿日期:2015-06-23 修回日期:2015-09-02 出版日期:2016-01-05 发布日期:2016-01-05
  • 通讯作者: You-Zhen Gui, Hai-Wen Cai E-mail:yzgui@siom.ac.cn;hwcai@siom.ac.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 61405227).

Joint transfer of time and frequency signals and multi-point synchronization via fiber network

Nan Cheng(程楠)1, Wei Chen(陈炜)1, Qin Liu(刘琴)2, Dan Xu(徐丹)1, Fei Yang(杨飞)1, You-Zhen Gui(桂有珍)2, Hai-Wen Cai(蔡海文)1   

  1. 1. Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
    2. Key Laboratory for Quantum Optics, CAS, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2015-06-23 Revised:2015-09-02 Online:2016-01-05 Published:2016-01-05
  • Contact: You-Zhen Gui, Hai-Wen Cai E-mail:yzgui@siom.ac.cn;hwcai@siom.ac.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 61405227).

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摘要：

A system of jointly transferring time signals with a rate of 1 pulse per second (PPS) and frequency signals of 10 MHz via a dense wavelength division multiplex-based (DWDM) fiber is demonstrated in this paper. The noises of the fiber links are suppressed and compensated for by a controlled fiber delay line. A method of calibrating and characterizing time is described. The 1PPS is synchronized by feed-forward calibrating the fiber delays precisely. The system is experimentally examined via a 110 km spooled fiber in laboratory. The frequency stabilities of the user end with compensation are 1.8× 10-14 at 1 s and 2.0× 10-17 at 104 s average time. The calculated uncertainty of time synchronization is 13.1 ps, whereas the direct measurement of the uncertainty is 12 ps. Next, the frequency and 1PPS are transferred via a metropolitan area optical fiber network from one central site to two remote sites with distances of 14 km and 110 km. The frequency stabilities of 14 km link reach 3.0× 10-14 averaged in 1 s and 1.4× 10-17 in 104 s respectively; and the stabilities of 110 km link are 8.3× 10-14 and 1.7× 10-17, respectively. The accuracies of synchronization are estimated to be 12.3 ps for the 14 km link and 13.1 ps for the 110 km link, respectively.

关键词: joint time and frequency transfer, optical compensation, time synchronization

Abstract:

A system of jointly transferring time signals with a rate of 1 pulse per second (PPS) and frequency signals of 10 MHz via a dense wavelength division multiplex-based (DWDM) fiber is demonstrated in this paper. The noises of the fiber links are suppressed and compensated for by a controlled fiber delay line. A method of calibrating and characterizing time is described. The 1PPS is synchronized by feed-forward calibrating the fiber delays precisely. The system is experimentally examined via a 110 km spooled fiber in laboratory. The frequency stabilities of the user end with compensation are 1.8× 10-14 at 1 s and 2.0× 10-17 at 104 s average time. The calculated uncertainty of time synchronization is 13.1 ps, whereas the direct measurement of the uncertainty is 12 ps. Next, the frequency and 1PPS are transferred via a metropolitan area optical fiber network from one central site to two remote sites with distances of 14 km and 110 km. The frequency stabilities of 14 km link reach 3.0× 10-14 averaged in 1 s and 1.4× 10-17 in 104 s respectively; and the stabilities of 110 km link are 8.3× 10-14 and 1.7× 10-17, respectively. The accuracies of synchronization are estimated to be 12.3 ps for the 14 km link and 13.1 ps for the 110 km link, respectively.

Key words: joint time and frequency transfer, optical compensation, time synchronization

中图分类号:  (Metrological applications; optical frequency synthesizers for precision spectroscopy)

  • 42.62.Eh
42.79.Sz (Optical communication systems, multiplexers, and demultiplexers?) 06.30.Ft (Time and frequency) 07.60.Vg (Fiber-optic instruments)