Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (12): 177 doi: 10.1007/s41365-019-0697-9

• ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

Phase-stabilized RF transmission system based on LLRF controller and optical delay line

Jia-Ji Liu1,2 • Xin-Peng Ma1,2 • Guo-Xi Pei1,2 • Nan Gan1,2 • Ji-Sen Yang1,2   

  1. 1 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-06-04 Revised:2019-09-30 Accepted:2019-10-01
  • Contact: Xin-Peng Ma E-mail:maxp@ihep.ac.cn
  • Supported by:
    This work was supported by the Foundation of the Key Laboratory of Particle Acceleration Physics and Technology of Chinese Academy of Sciences (No. 29201531231141001)
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Jia-Ji Liu, Xin-Peng Ma, Guo-Xi Pei, Nan Gan, Ji-Sen Yang. Phase-stabilized RF transmission system based on LLRF controller and optical delay line.Nuclear Science and Techniques, 2019, 30(12): 177     doi: 10.1007/s41365-019-0697-9
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Abstract: Radio frequency (RF) transmission systems with high-precision phase stability are required by the next generation of particle colliders and light sources. An RF transmission system was designed to meet this requirement. In this system, RF signal generated at the sending end is modulated onto a continuous wave (CW) optical carrier, transmitted through an optical fiber, and demodulated at the receiving end. The phase drift is detected by a digital phase monitor with femtosecond-level accuracy and compensated by a motorized optical fiber delay line (ODL). The measurement results show that the long-term phase drifts can be stabilized to within 100 fs (pk–pk), 500 fs (pk–pk), and 1.8 ps (pk–pk) in a 400-meter-long optical fiber over 1 h, 24 h, and 10 days, respectively.

Key words: RF transmission, Phase-stable optical fiber, Phase drift, Phase noise, Femtosecond, Picosecond, Digital phase monitor