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Chin. Phys. B, 2020, Vol. 29(6): 064209    DOI: 10.1088/1674-1056/ab84d6

Microwave frequency transfer over a 112-km urban fiber link based on electronic phase compensation

Wen-Xiang Xue(薛文祥)1,2,3, Wen-Yu Zhao(赵文宇)1,2, Hong-Lei Quan(全洪雷)1,2,3, Cui-Chen Zhao(赵粹臣)1,2,3, Yan Xing(邢燕)1,2, Hai-Feng Jiang(姜海峰)1,2, Shou-Gang Zhang(张首刚)1,2
1 National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, China;
2 Key Laboratory of Time and Frequency Primary Standards, Chinese Academy of Sciences, Xi'an 710600, China;
3 School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China

We demonstrate the transmission of a microwave frequency signal at 10 GHz over a 112-km urban fiber link based on a novel simple-architecture electronic phase compensation system. The key element of the system is the low noise frequency divider by 4 to differentiate the frequency of the forward signal from that of the backward one, thus suppressing the effect of Brillouin backscattering and parasitic reflection along the link. In terms of overlapping Allan deviation, the frequency transfer instability of 4.2×10-15 at 1-s integration time and 1.6×10-18 at one-day integration time was achieved. In addition, its sensitivity to the polarization mode dispersion in fiber is analyzed by comparing the results with and without laser polarization scrambling. Generally, with simplicity and robustness, the system can offer great potentials in constructing cascaded frequency transfer system and facilitate the building of fiber-based microwave transfer network.

Keywords:  microwave frequency transfer      phase compensation      polarization mode dispersion  
Received:  03 February 2020      Revised:  09 March 2020      Accepted manuscript online: 
PACS:  42.62.Eh (Metrological applications; optical frequency synthesizers for precision spectroscopy)  
  42.79.Sz (Optical communication systems, multiplexers, and demultiplexers?)  
  06.30.Ft (Time and frequency)  
  42.81.Uv (Fiber networks)  

Project supported by the National Natural Science Foundation of China (Grant Nos. 61825505, 91536217, and 61127901).

Corresponding Authors:  Shou-Gang Zhang     E-mail:

Cite this article: 

Wen-Xiang Xue(薛文祥), Wen-Yu Zhao(赵文宇), Hong-Lei Quan(全洪雷), Cui-Chen Zhao(赵粹臣), Yan Xing(邢燕), Hai-Feng Jiang(姜海峰), Shou-Gang Zhang(张首刚) Microwave frequency transfer over a 112-km urban fiber link based on electronic phase compensation 2020 Chin. Phys. B 29 064209

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