| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Optical PAM-4/PAM-8 generation via dual-Raman process in Rydberg atoms |
| Xiao-Yun Song(宋晓云)1, Zheng Yin(尹政)1, Guan-Yu Ren(任冠宇)1, Ming-Zhi Han(韩明志)3, Ai-Hong Yang(杨艾红)1,‡, Yi-Hong Qi(祁义红)2,§, and Yan-Dong Peng(彭延东)1,† |
1 Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering, Shandong University of Science and Technology, Qingdao 266590, China;
2 School of Physics, East China University of Science and Technology, Shanghai 200237, China;
3 MIIT Key Laboratory of Complex-field Intelligent Exploration, Beijing Institute of Technology, Beijing 100081, China |
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Abstract A scheme of optical four-level pulse amplitude modulation (PAM-4) is proposed based on dual-Raman process in Rydberg atoms. A probe field counter-propagates with a dual-Raman field which drives the ground and the excited states transition, respectively, and the Rydberg transition is driven by a microwave (MW) field. A gain peak appears in the probe transmission and is sensitive to the MW field strength. Optical PAM-4 can be achieved by encoding an MW signal and decoding the magnitude of a probe signal. Simulation results show that the differential nonlinearity and the integral nonlinearity of the proposed scheme can be reduced by 5 times and 6 times, respectively, compared with the counterparts of previous scheme, and the ratio of level separation mismatch is close to the ideal value 1. Moreover, the scheme is extended to optical PAM-8 signal, which may further improve the spectral efficiency.
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Received: 21 December 2023
Revised: 03 March 2024
Accepted manuscript online: 13 March 2024
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PACS:
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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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32.80.Qk
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(Coherent control of atomic interactions with photons)
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32.80.Ee
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(Rydberg states)
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42.50.Ex
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(Optical implementations of quantum information processing and transfer)
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| Fund: Project supported by the Shandong Natural Science Foundation, China (Grant No. ZR2021LLZ006), the National Natural Science Foundation of China (Grant Nos. 61675118 and 12274123), the Taishan Scholars Program of Shandong Province, China (Grant No. ts20190936), and the Shandong University of Science and Technology Research Fund, China (Grant No. 2015TDJH102). |
Corresponding Authors:
Ai-Hong Yang, Yi-Hong Qi, Yan-Dong Peng
E-mail: pengyd@sdust.edu.cn;yangah_phys@163.com;qiyihong@ecust.edu.cn
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Cite this article:
Xiao-Yun Song(宋晓云), Zheng Yin(尹政), Guan-Yu Ren(任冠宇), Ming-Zhi Han(韩明志), Ai-Hong Yang(杨艾红), Yi-Hong Qi(祁义红), and Yan-Dong Peng(彭延东) Optical PAM-4/PAM-8 generation via dual-Raman process in Rydberg atoms 2024 Chin. Phys. B 33 064203
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