首页|Optical PAM-4/PAM-8 generation via dual-Raman process in Rydberg atoms
Optical PAM-4/PAM-8 generation via dual-Raman process in Rydberg atoms
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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.
Rydberg atomsPAM-4/PAM-8dual-Raman process
宋晓云、尹政、任冠宇、韩明志、杨艾红、祁义红、彭延东
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Qingdao Key Laboratory of Terahertz Technology,College of Electronic and Information Engineering,Shandong University of Science and Technology,Qingdao 266590,China
MIIT Key Laboratory of Complex-field Intelligent Exploration,Beijing Institute of Technology,Beijing 100081,China
School of Physics,East China University of Science and Technology,Shanghai 200237,China
Shandong Natural Science Foundation,China国家自然科学基金国家自然科学基金Taishan Scholars Program of Shandong Province,ChinaShandong University of Science and Technology Research Fund,China
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