Optical PAM-4/PAM-8 generation via dual-Raman process in Rydberg atoms  

作　　者：宋晓云 尹政 任冠宇 韩明志 杨艾红 祁义红 彭延东 Xiao-Yun Song;Zheng Yin;Guan-Yu Ren;Ming-Zhi Han;Ai-Hong Yang;Yi-Hong Qi;Yan-Dong Peng(Qingdao Key Laboratory of Terahertz Technology,College of Electronic and Information Engineering,Shandong University of Science and Technology,Qingdao 266590,China;School of Physics,East China University of Science and Technology,Shanghai 200237,China;MIIT Key Laboratory of Complex-field Intelligent Exploration,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[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

出　　处：《Chinese Physics B》2024年第6期383-388,共6页中国物理B（英文版）

基　　金：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);the Shandong University of Science and Technology Research Fund,China(Grant No. 2015TDJH102)。

摘　　要：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.

关 键 词：Rydberg atoms PAM-4/PAM-8 dual-Raman process 

分 类 号：TN929.1[电子电信—通信与信息系统]