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Optimization strategies for operational parameters of Rydberg atom-based amplitude modulation receiver |
| Yuhao Wu(吴宇豪), Dongping Xiao(肖冬萍)†, Huaiqing Zhang(张淮清), and Sheng Yan(阎晟) |
| National Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 40044, China |
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Abstract The Rydberg atom-based receiver, as a novel type of antenna, demonstrates broad application prospects in the field of microwave communications. However, since Rydberg atomic receivers are nonlinear systems, mismatches between the parameters of the received amplitude modulation (AM) signals and the system's linear workspace and demodulation operating points can cause severe distortion in the demodulated signals. To address this, the article proposes a method for determining the operational parameters based on the mean square error (MSE) and total harmonic distortion (THD) assessments and presents strategies for optimizing the system's operational parameters focusing on linear response characteristics (LRC) and linear dynamic range (LDR). Specifically, we employ a method that minimizes the MSE to define the system's linear workspace, thereby ensuring the system has a good LRC while maximizing the LDR. To ensure that the signal always operates within the linear workspace, an appropriate carrier amplitude is set as the demodulation operating point. By calculating the THD at different operating points, the LRC performance within different regions of the linear workspace is evaluated, and corresponding optimization strategies based on the range of signal strengths are proposed. Moreover, to more accurately restore the baseband signal, we establish a mapping relationship between the carrier Rabi frequency and the transmitted power of the probe light, and optimize the slope of the linear demodulation function to reduce the MSE to less than $0.8\times 10^{-4}$. Finally, based on these methods for determining the operational parameters, we explore the effects of different laser Rabi frequencies on the system performance, and provide optimization recommendations. This research provides robust support for the design of high-performance Rydberg atom-based AM receivers.
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Received: 13 July 2024
Revised: 21 September 2024
Accepted manuscript online: 18 October 2024
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PACS:
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32.80.Ee
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(Rydberg states)
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42.50.Gy
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(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
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42.60.Fc
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(Modulation, tuning, and mode locking)
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84.30.Qi
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(Modulators and demodulators; discriminators, comparators, mixers, limiters, and compressors)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. U22B2095) and the Civil Aerospace Technology Research Project (Grant No. D010103). |
Corresponding Authors:
Dongping Xiao
E-mail: xiaodongping@cqu.edu.cn
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Cite this article:
Yuhao Wu(吴宇豪), Dongping Xiao(肖冬萍), Huaiqing Zhang(张淮清), and Sheng Yan(阎晟) Optimization strategies for operational parameters of Rydberg atom-based amplitude modulation receiver 2025 Chin. Phys. B 34 013201
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