量子电子学报 ›› 2023, Vol. 40 ›› Issue (6): 868-878.doi: 10.3969/j.issn.1007-5461.2023.06.007

• 激光技术与器件 • 上一篇    下一篇

应用于高速 MDI-QKD 系统的脉冲激光器研制

何宗武 1,2, 黄思诚 1,3, 温昕澄 1,3, 马庆力 4∗, 阴泽杰 1,2   

  1. ( 1 中国科学技术大学核探测与核电子学国家重点实验室, 安徽 合肥 230026; 2 中国科学技术大学近代物理系, 安徽 合肥 230026; 3 中国科学技术大学国家同步辐射实验室, 安徽 合肥 230029; 4 国防科技大学电子对抗学院, 安徽 合肥 230038 )
  • 收稿日期:2022-01-18 修回日期:2022-03-14 出版日期:2023-11-28 发布日期:2023-11-28
  • 通讯作者: E-mail: maql@ustc.edu.cn E-mail:E-mail: maql@ustc.edu.cn
  • 作者简介:何宗武 ( 1997 - ), 安徽合肥人, 研究生, 主要从事量子密钥分发中高重复频率窄脉冲激光器的研究。 E-mail: zwhe1@mail.ustc.edu.cn
  • 基金资助:
    国家自然科学基金 (11975307, 11575184)

Design of a pulse laser applied to high⁃speed MDI⁃QKD system

HE Zongwu1,2 , HUANG Sicheng1,3 , WEN Xincheng1,3 , MA Qingli 4∗, YIN Zejie1,2   

  1. ( 1 State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China; 2 Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China; 3 National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China; 4 Electronic Countermeasure Institute, National University of Defense Technology, Hefei 230038, China )
  • Received:2022-01-18 Revised:2022-03-14 Published:2023-11-28 Online:2023-11-28

摘要: 在高速测量设备无关量子密钥分发(MDI-QKD)系统中, 高成码率是实现远距离量子通信的关键。为实现 更高的成码率, 系统各环节对光源有着更多的要求。针对这些要求设计了应用于高速MDI-QKD系统的脉冲激光器 电路。通过对外部或内部触发信号的模拟调理及驱动设计, 实现了脉冲激光的产生; 通过模拟PID控制与双向TEC 电流控制, 实现了温度的稳定。最终获得的脉冲光能够实现最高1.25 GHz重复频率、 24.2 ps脉冲半高宽、 30 dB消 光比、 0.95 pm 波长抖动以及 2.014 nm 波长调谐范围的输出, 有利于成码率的提高, 满足高速 MDI-QKD 系统的 要求。

关键词: 激光技术, 量子密钥分发, 脉冲激光, 高重复频率, 窄脉冲宽度

Abstract: In the high-speed machine device independent quantum key distribution (MDI-QKD) system, the high code rate is crucial to realize long-distance quantum communication. To achieve a higher code rate, each link of the system has more requirements on the light source. To achieve the requirements, we design the pulse laser circuit for the high-speed MDI-QKD system. By analog processing and driving the external or internal trigger signal, the circuit can generate the pulse laser. By analog PID control bidirectional TEC current control, the circuit can stabilize the temperature. The outgoing pulse laser achieves a repetition of up to 1.25 GHz, a full width at half maximum of 24.2 ps, an extinction ratio of 30 dB, a wavelength jitter of 0.95 pm and a wavelength tuning range of 2.014 nm, which is beneficial to the improvement of the code rate. The pulse laser circuit meets the requirements of the high-speed MDI-QKD system.

Key words: laser techniques, quantum key distribution, pulse laser, high repetition rate, narrow pulse width

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