Research on control technology of single detection based on position correction in quantum optical communication

Li Zhijun; Mao Yao; Qi Bo; Zhou Xi; Liu Qiong; Zhou Qian

doi:10.12086/oee.2022.210311

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Li Z J, Mao Y, Qi B, et al. Research on control technology of single detection based on position correction in quantum optical communication[J]. Opto-Electron Eng, 2022, 49(3): 210311. doi: 10.12086/oee.2022.210311

Citation:

Li Z J, Mao Y, Qi B, et al. Research on control technology of single detection based on position correction in quantum optical communication[J]. Opto-Electron Eng, 2022, 49(3): 210311. doi: 10.12086/oee.2022.210311

Research on control technology of single detection based on position correction in quantum optical communication

1.
Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, Sichuan 610209, China
2.
Key Laboratory Optical Engineering, Chinese Academy of Sciences, Chengdu, Sichuan 610209, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Fund Project: National Natural Science Foundation of China (61905253)

More Information

Corresponding author: maoyao@ioe.ac.cn

Received Date 24 September 2021

Revised Date 04 January 2022

Published Date 25 March 2022

Abstract

Abstract

In the optical system of quantum communication optical ground station, two fast control mirrors, corresponding to precision and high-precision tracking, are used to form a single detection mode closed loop. In order to ensure the control accuracy and stability of the system, decoupling must be considered in the control process. However, when the SNR of the target is low, it is difficult to realize the accurate decoupling of precision and high-precision tracking loops. This paper proposes to add a position sensor in precision and high-precision tracking loops, respectively. On the one hand, the position sensor closed-loop is used to improve the certainty of the inner loop control object and facilitate parameter setting. On the other hand, the deviation of the position sensor reflects the deviation of the TV miss distance. The fine tracking adopts the correction of the deviation of the position sensor for closed-loop, so as to avoid system decoupling. This paper analyzes the object characteristics, control system design method, and robustness of the compound axis control structure based on this method. Theoretical and experimental results show that the proposed method has better robustness and higher accuracy without decoupling control when the target characteristics are poor, especially when the delay changes greatly.
- single detection /
- position correction /
- decoupling /
- robustness

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References

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Overview

Overview

As a beam precise capture and tracking structure in quantum communication systems, ATP plays a vital role in the performance of quantum communication. In order to ensure the tracking accuracy and tracking range, the composite axis tracking mode of coarse and fine tracking is mostly used at present. However, in the coarse fine tracking compound axis mode, the size and ratio of the coarse fine tracking field of view are limited. In order to solve this problem, based on the existing optical path architecture of the ATP system, a primary transition field of view is added, and the corresponding tracking mirror of the transition field of view is added, forming a series structure of double fast control mirrors for precision tracking and high-precision tracking. In this structure, the fast deflection mirror with large stroke and low bandwidth and the fine tracking detector with low sampling frequency first form a fine tracking closed loop to complete the fine tracking with a large range and low bandwidth. On this basis, another fast deflection mirror with small stroke and high bandwidth is combined with a high-precision tracking detector with high sampling frequency to form a high-precision tracking closed loop to realize high-precision and high-bandwidth high-precision tracking. In order to further improve the control accuracy, after the double closed-loop stability of fine TV and high-precision TV, the high-precision TV with a high frame rate is also used for the closed-loop of the large travel tracking mirror, forming a single detection control structure. However, the parameter tuning of this structure is based on the small change of object characteristics. At the same time, it is also necessary to accurately calibrate the target characteristics, so as to facilitate the accurate decoupling of fine tracking and high-precision tracking. The debugging of the controller is complex, and the system robustness is poor under the condition of large changes of target and background. In this paper, a relative angle sensor is added in the high-precision tracking and the position inner loop is added on the basis of the high-precision TV closed loop. On the one hand, the certainty of the control object itself is improved and it is convenient for parameter tuning. On the other hand, the deviation of the sensor is used in the fine tracking closed loop to avoid the problem of system decoupling. This paper analyzes the object characteristics, control system design method and robustness of the compound axis control structure based on this method. The theoretical and experimental results show that when the target characteristics are poor, especially when the lag changes greatly, the proposed method does not need decoupling control and has better robustness and higher accuracy.