| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Robust Transfer of Optical Frequency over 500 km Fiber Link with Instability of $10^{-21}$ |
| Qian Zhou1,2,3,4, Xiang Zhang1,3*, Qi Zang1,3, Mengfan Wu1,3, Dan Wang1,2,3, Jie Liu1,3, Ruifang Dong1,2,3*, Tao Liu1,2,3,4*, and Shougang 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
4Hefei National Laboratory, Hefei 230088, China
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| Cite this article: |
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Qian Zhou, Xiang Zhang, Qi Zang et al 2024 Chin. Phys. Lett. 41 084202 |
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Abstract Our primary objective is to mitigate the adverse effects of temperature fluctuations on the optical frequency transmission system by reducing the length of the interferometer. Following optimization, the phase-temperature coefficient of the optical system is reduced to approximately 1.35 fs/K. By applying a sophisticated temperature control to the remained “out-of-loop” optics fiber, the noise floor of the system has been effectively lowered to $10^{-21}$ level. Based on this performance-enhanced transfer system, we demonstrate coherent transmission of optical frequency through 500-km spooled fiber link. After being actively compensated, the transfer instability of $4.5\times 10^{-16}$ at the averaging time of 1 s and $5.6\times 10^{-21}$ at 10000 s is demonstrated. The frequency uncertainty of received light at remote site relative to that of the origin light at local site is achieved to be $1.15\times 10^{-19}$. This enhanced system configuration is particularly well suited for future long-distance frequency transmission and comparison of the most advanced optical clock signals.
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Received: 15 April 2024
Editors' Suggestion
Published: 27 August 2024
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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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