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Coherent optical frequency transfer via 972-km fiber link |
| Xue Deng(邓雪)1,2,3, Xiang Zhang(张翔)1,2, Qi Zang(臧琦)1,2, Dong-Dong Jiao(焦东东)1,2, Dan Wang(王丹)1,2, Jie Liu(刘杰)1,2, Jing Gao(高静)1,2, Guan-Jun Xu (许冠军)1,2,†, Rui-Fang Dong(董瑞芳)1,2,‡, Tao Liu(刘涛)1,2,§, and Shou-Gang Zhang(张首刚)1,2 |
1 National Time Service Centre, Chinese Academy of Sciences, Xi'an 710600, China;
2 Key Laboratory of Time Reference and Application, Chinese Academy of Sciences, Xi'an 710600, China;
3 School of Communications and Information Engineering and School of Artificial Intelligence, Xi'an University of Posts and Telecommunications, Xi'an 710121, China |
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Abstract We demonstrate coherent optical frequency dissemination over a distance of 972 km by cascading two spans where the phase noise is passively compensated for. Instead of employing a phase discriminator and a phase locking loop in the conventional active phase control scheme, the passive phase noise cancellation is realized by feeding double-trip beat-note frequency to the driver of the acoustic optical modulator at the local site. This passive scheme exhibits fine robustness and reliability, making it suitable for long-distance and noisy fiber links. An optical regeneration station is used in the link for signal amplification and cascaded transmission. The phase noise cancellation and transfer instability of the 972-km link is investigated, and transfer instability of 1.1×10-19 at 104 s is achieved. This work provides a promising method for realizing optical frequency distribution over thousands of kilometers by using fiber links.
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Received: 11 September 2023
Revised: 11 October 2023
Accepted manuscript online: 24 October 2023
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PACS:
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06.30.Ft
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(Time and frequency)
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42.81.-i
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(Fiber optics)
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95.55.Sh
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(Auxiliary and recording instruments; clocks and frequency standards)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12103059, 12033007, 12303077, and 12303076), the Fund from the Xi’an Science and Technology Bureau, China (Grant No. E019XK1S04), and the Fund from the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. 1188000XGJ). |
Corresponding Authors:
Guan-Jun Xu, Rui-Fang Dong, Tao Liu
E-mail: xuguanjun@ntsc.ac.cn;dongruifang@ntsc.ac.cn;taoliu@ntsc.ac.cn
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Cite this article:
Xue Deng(邓雪), Xiang Zhang(张翔), Qi Zang(臧琦), Dong-Dong Jiao(焦东东), Dan Wang(王丹), Jie Liu(刘杰), Jing Gao(高静), Guan-Jun Xu (许冠军), Rui-Fang Dong(董瑞芳), Tao Liu(刘涛), and Shou-Gang Zhang(张首刚) Coherent optical frequency transfer via 972-km fiber link 2024 Chin. Phys. B 33 020602
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