中国物理B ›› 2024, Vol. 33 ›› Issue (2): 20602-020602.doi: 10.1088/1674-1056/ad0629

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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. 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
  • 收稿日期:2023-09-11 修回日期:2023-10-11 接受日期:2023-10-24 出版日期:2024-01-16 发布日期:2024-01-16
  • 通讯作者: Guan-Jun Xu, Rui-Fang Dong, Tao Liu E-mail:xuguanjun@ntsc.ac.cn;dongruifang@ntsc.ac.cn;taoliu@ntsc.ac.cn
  • 基金资助:
    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).

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. 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
  • Received:2023-09-11 Revised:2023-10-11 Accepted:2023-10-24 Online:2024-01-16 Published:2024-01-16
  • Contact: Guan-Jun Xu, Rui-Fang Dong, Tao Liu E-mail:xuguanjun@ntsc.ac.cn;dongruifang@ntsc.ac.cn;taoliu@ntsc.ac.cn
  • Supported by:
    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).

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摘要： 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.

关键词: optical frequency transfer, fiber link, phase noise cancellation

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.

Key words: optical frequency transfer, fiber link, phase noise cancellation

中图分类号:  (Time and frequency)

  • 06.30.Ft
42.81.-i (Fiber optics) 95.55.Sh (Auxiliary and recording instruments; clocks and frequency standards)