Title: Correlation Measurement of Co-Located Hydrogen Masers Using Fiber-Based Frequency Synchronization Network
Author(s): Yichen Guo, Bo Wang, Jingwen Dong, Hongwei Si, Lijun Wang
Published in: Proceedings of the 49th Annual Precise Time and Time Interval Systems and Applications Meeting
January 29 - 1, 2018
Hyatt Regency Reston
Reston, Virginia
Pages: 138 - 142
Cite this article: Guo, Yichen, Wang, Bo, Dong, Jingwen, Si, Hongwei, Wang, Lijun, "Correlation Measurement of Co-Located Hydrogen Masers Using Fiber-Based Frequency Synchronization Network," Proceedings of the 49th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, January 2018, pp. 138-142.
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Abstract: The rapid development of high-precision time and frequency transfer techniques allow the real-time comparison of remote hydrogen masers (H-masers). Since the year of 2013, we have been working on building a fiber-based frequency synchronization network in Beijing, using our homemade frequency transfer devices and buried city fiber links. So far, frequency signals of 3 Hmasers from 2 different institutes are transferred to our laboratory in Tsinghua University and are compared with the local Hmaser in real time, forming up a clock ensemble of 4 clocks from 3 places. Using this frequency network, we studied the correlation of the pair of co-located H-masers. With our measurement we found that the correlation is at the magnitude of 10?30 and only shows up after the averaging time is larger than 103s.