Lens-free wavefront shaping method for a diffuse non-lineof-sight link in visible light communication  

作　　者：陈超旭 周晓萌 李子薇 沈超 张俊文 施剑阳 迟楠 Chaoxu Chen;Xiaomeng Zhou;Ziwei Li;Chao Shen;Junwen Zhang;Jianyang Shi;Nan Chi(Key Laboratory for Information Science of Electromagnetic Waves(MoE),Fudan University,Shanghai 200433,China;Peng Cheng Laboratory,Shenzhen 518038,China)

机构地区：[1]Key Laboratory for Information Science of Electromagnetic Waves(MoE),Fudan University,Shanghai 200433,China [2]Peng Cheng Laboratory,Shenzhen 518038,China

出　　处：《Chinese Optics Letters》2024年第2期81-87,共7页中国光学快报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2022YFB2802803);the National Natural Science Foundation of China(Nos.61925104,62031011,and 62201157)。

摘　　要：In this Letter,we propose and experimentally demonstrate a lens-free wavefront shaping method that utilizes synchronized signal block beam alignment and a genetic algorithm(SSBGA)for a diffuse non-line-of-sight(NLOS)visible light communication(VLC)system.The proposed method effectively controls the position and mobility of visible light beams by partitioning spatial light modulator pixels and manipulating beams to converge at distinct spatial positions,thereby enhancing wavefront shaping efficiency,which achieves a significant 23.9 dB optical power enhancement at+2 mm offset,surpassing the lens-based continuous sequence(CS)scheme by 21.7 dB.At+40°angle,the improvement reaches up to 11.8 dB and 16.8 dB compared to the results with and without lens-based CS,respectively.A maximum rate of 5.16 Gbps is successfully achieved using bit-power loading discrete multi-tone(DMT)modulation and the proposed SSBGA in an NLOS VLC system,which outperforms the lens-based CS by 1.07 Gbps and obtains a power saving of 55.6%during the transmission at4 Gbps.To the best of our knowledge,this is the first time that high-speed communication has been realized in an NLOS VLC system without a lens.

关 键 词：NON-LINE-OF-SIGHT lens-free wavefront shaping visible light communication 

分 类 号：TN929.1[电子电信—通信与信息系统]