| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Novel Polarization Control Approach to Long-Term Fiber-Optic Frequency Transfer |
| Dong-Jie Wang1,2,3, Xiang Zhang1,2,3, Jie Liu1,3, Dong-Dong Jiao1,2,3, Xue Deng1,2,3, Jing Gao1,2,3, Qi Zang1,2,3, Dan Wang1,3, Tao Liu1,2,3*, Rui-Fang Dong1,2,3, and Shou-Gang Zhang1,2,3 |
1National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, China
2University of Chinese Academy of Sciences, Beijing 100049, China
3Key Laboratory of Time and Frequency Standards, Chinese Academy of Sciences, Xi'an 710600, China
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| Cite this article: |
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Dong-Jie Wang, Xiang Zhang, Jie Liu et al 2020 Chin. Phys. Lett. 37 094201 |
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Abstract We demonstrate a novel polarization control system based on a gradient descent algorithm, applied to a 450-km optical frequency transfer link. The power of the out-loop beat note is retrieved by controlling the polarization state of the transferred signal, with a recovery time of 24 ms, thereby ensuring the long-term evaluation of the fiber link. As a result, data utilization is enhanced from 70% to 99% over a continuous measurement period of $\sim$12 h. A fractional transfer instability of $7.2 \times 10^{-20}$ is achieved at an integration time of 10000 s. This work lays the foundation for the comparison of a remote optical clock system via a long-haul optical fiber link.
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Received: 12 June 2020
Published: 01 September 2020
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| PACS: |
42.62.Eh
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(Metrological applications; optical frequency synthesizers for precision spectroscopy)
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42.79.Sz
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(Optical communication systems, multiplexers, and demultiplexers?)
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06.30.Ft
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(Time and frequency)
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| Fund: Supported by the National Key Research and Development Program of China (Grant No. 2016YFF0200200), the National Natural Science Foundation of China (Grant Nos. 91636101, 91836301 and 11803041), the West Light Foundation of the Chinese Academy of Sciences (Grant No. XAB2016B47), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21000000). |
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