50 m/187.5 Mbit/s real-time underwater wireless optical communication based on optical superimposition  

作　　者：程永鑫 杨兴启 张雨凡 张超 张皓 童志坚 戴逸展 吕伟超 李鑫 邹海吾 张泽君 徐敬 Yongxin Cheng;Xingqi Yang;Yufan Zhang;Chao Zhang;Hao Zhang;Zhijian Tong;Yizhan Dai;Weichao Lü;Xin Li;Haiwu Zou;Zejun Zhang;Jing Xu(Optical Communications Laboratory,Ocean College,Zhejiang University,Zhoushan 316021,China;Hainan Institute of Zhejiang University,Sanya 572025,China;Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province,Ocean College,Zhejiang University,Zhoushan 316021,China)

机构地区：[1]Optical Communications Laboratory,Ocean College,Zhejiang University,Zhoushan 316021,China [2]Hainan Institute of Zhejiang University,Sanya 572025,China [3]Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province,Ocean College,Zhejiang University,Zhoushan 316021,China

出　　处：《Chinese Optics Letters》2023年第2期14-20,共7页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)(No.61971378);Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA22030208);Zhoushan-Zhejiang University Joint Research Project(No.2019C81081)。

摘　　要：In this paper,an optical pulse amplitude modulation with 4 levels(PAM-4)using a fiber combiner is proposed to enhance the data rate of a field-programmable gate-array-based long-distance real-time underwater wireless optical communication system.Two on-off keying signals with different amplitudes are used to modulate two pigtailed laser diodes,respectively,and the generated optical signals are superimposed into optical PAM-4 signals by a fiber combiner.The optical PAM-4scheme can effectively alleviate the nonlinearity,although it reduces the peak-to-peak value of the emitting optical power by 25%.A real-time data rate of 187.5 Mbit/s is achieved by using the optical PAM-4 with a transmission distance of 50 m.The data rate is increased by about 25%compared with the conventional electrical PAM-4 in the same condition.

关 键 词：underwater wireless optical communication FPGA PAM-4 

分 类 号：TN929.1[电子电信—通信与信息系统]