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Chinese Optics Letters 2024年第6期22卷 116-122页

作者： Haoyu Zhang Li Yao Chaoxu Chen Yuan Wei Chao Shen jianyang shi Junwen Zhang Ziwei Li Nan Chi Key Laboratory for Information Science of Electromagnetic Waves(MoE) Department of Communication Science and EngineeringSchool of Information Science and TechnologyFudan UniversityShanghai 200433China Shanghai CIC of LEO Satellite Communication Technology Fudan UniversityShanghai 200433China Shanghai ERC of LEO Satellite Communication and Application Fudan UniversityShanghai 200433China

This Letter proposes a post-equalizer for underwater visible light communication(UVLC) systems that combines channel estimation and joint time-frequency analysis, named channel-estimation-based bandpass variable-order time-frequency network(CBV-TFNet). By utilizing a bandpass variable-order loss function with communication prior knowledge, CBVTFNet enhances communication performance and training stability. It enables lightweight implementation and faster convergence through a channel estimation-based mask. The superior performance of the proposed equalization method over Volterra and deep neural network(DNN)-based methods has been studied experimentally. Using bit-power loading discrete multitone (DMT) modulation, the proposed method achieves a transmission bitrate of 4.956 Gbps through a 1.2 m underwater channel utilizing only 38.15% of real multiplication calculations compared to the DNN equalizer and achieving a bitrate gain of440 Mbps and a significantly larger dynamic range over the LMS-Volterra equalizer. Results highlight CBV-TFNet's potential for future post-equalization in UVLC systems.

关键词： underwater visible light communication channel estimation post-equalizer neural network

High-speed GaN-based laser diode with modulation bandwidth exceeding 5 GHz for 20 Gbps visible light communication

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Photonics Research 2024年第6期12卷 1186-1193页

作者： JUNFEI WANG JUNHUI HU CHAOWEN GUAN YUQI HOU ZENGYI XU LEIHAO SUN YUE WANG YUNING ZHOU BOON S.OOI jianyang shi ZIWEI LI JUNWEN ZHANG NAN CHI SHAOHUA YU CHAO SHEN School of Information Science and Technology Fudan UniversityShanghai 200433China Peng Cheng Laboratory Shenzhen 518000China ZGC Institute of Ubiquitous-X Innovation and Applications Beijing 100876China Photonics Laboratory King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia

Visible light communication(VLC)based on laser diodes demonstrates great potential for high data rate maritime,terrestrial,and aerial wireless data ***,we design and fabricate high-speed blue laser diodes(LDs)grown on c-plane gallium nitride(GaN)*** was achieved through active region design and miniaturization toward a narrow ridge waveguide,short cavity length,and single longitudinal mode Fabry–Perot laser *** fabricated mini-LD has a low threshold current of 31 mA and slope efficiency of 1.02 W/A.A record modulation bandwidth of 5.9 GHz(−3dB)was measured from the *** the developed mini-LD as a transmitter,the VLC link exhibits a high data transmission rate of 20.06 Gbps adopting the bit and power loading discrete multitone(DMT)modulation *** corresponding bit error rate is 0.003,satisfying the forward error correction *** demonstrated GaN-based mini-LD has significantly enhanced data transmission rates,paving the path for energy-efficient VLC systems and integrated photonics in the visible regime.

关键词： communication diode waveguide

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

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Chinese Optics Letters 2024年第2期22卷 81-87页

作者：陈超旭周晓萌李子薇沈超张俊文施剑阳迟楠 Key Laboratory for Information Science of Electromagnetic Waves(MoE) Fudan UniversityShanghai 200433China Peng Cheng Laboratory Shenzhen 518038China

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)*** 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 ***+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 *** 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

Flexible 2 × 2 multiple access visible light communication system based on an integrated parallel GaN/InGaN micro-photodetector array module

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Photonics Research 2024年第4期12卷 793-803页

作者： ZENGYI XU XIANHAO LIN ZHITENG LUO QIANYING LIN JIANLI ZHANG GUANGXU WANG XIAOLAN WANG FENGYI JIANG ZIWEI LI jianyang shi JUNWEN ZHANG CHAO SHEN NAN CHI Key Laboratory for Information Science of Electromagnetic Waves(MoE) Department of Communication Science and EngineeringFudan UniversityShanghai 200433China National Institute of LED on Silicon Substrate Nanchang UniversityNanchang 330096China

In recent studies, visible light communication(VLC) has been predicted to be a prospective technique in the future 6G communication systems. To suit the trend of exponentially growing connectivity, researchers have intensively studied techniques that enable multiple access(MA) in VLC systems, such as the MIMO system based on LED devices to support potential applications in the Internet of Things(IoT) or edge computing in the nextgeneration access network. However, their transmission rate is limited due to the intrinsic bandwidth of ***, the majority of visible light laser communication (VLLC) research with beyond 10 Gb/s data rates concentrates on point-to-point links, or using discrete photodetector(PD) devices instead of an integrated array PD. In this paper, we demonstrated an integrated PD array device fabricated with a Si-substrated GaN/InGaN multiple-quantum-well(MQW) structure, which has a 4 × 4 array of 50 μm × 50 μm micro-PD units with a common cathode and anode. This single-integrated array successfully provides access for two different transmitters simultaneously in the experiment, implementing a 2 × 2 MIMO-VLLC link at 405 nm. The highest data rate achieved is 13.2 Gb/s, and the corresponding net data rate(NDR) achieved is 12.27 Gb/s after deducing the FEC overhead, using 2.2 GHz bandwidth and superposed PAM signals. Furthermore, we assess the Huffman-coded coding scheme, which brings a fine-grain adjustment in access capacity and enhances the overall data throughput when the user signal power varies drastically due to distance, weather, or other challenges in the channel condition. As far as we know, this is the first demonstration of multiple visible light laser source access based on a single integrated GaN/InGaN receiver module.

关键词： communication visible light

新媒体时代城建档案管理信息化现状及对策研究

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新闻研究导刊 2024年第4期15卷 57-59页

作者：史建阳安溪县房地产交易中心福建安溪362400

城建档案是城市记忆的载体,记载了城市的发展轨迹和时代变迁,在新时期的城市建设与发展中发挥着重要作用。基于城建档案的这一重要属性,应当积极推进新媒体技术在城建档案管理中的应用,以此提升城建档案管理的信息化水平,以更加丰富多... 详细信息

城建档案是城市记忆的载体,记载了城市的发展轨迹和时代变迁,在新时期的城市建设与发展中发挥着重要作用。基于城建档案的这一重要属性,应当积极推进新媒体技术在城建档案管理中的应用,以此提升城建档案管理的信息化水平,以更加丰富多样的形式呈现城建档案,更好地记录城市的发展与建设状况。对此,文章采取文献资料分析、理论研究、案例分析等方法,研究城建档案信息化管理的可行性、重要性,分析城建档案管理信息化的现实状况,而后提出相应的优化对策。研究发现,新媒体时代推动城建档案信息化管理能显著提升城建档案的管理效率,推动档案的开发利用,为城市建设添砖加瓦。同时,现阶段一些城市在城建档案管理方面仍存在档案数字化转型不足、管理队伍建设不到位、信息安全与数据防护不足、数据整合与共享水平不高等问题,降低了城建档案管理的信息化水平。在未来的管理工作中,主管部门应强化共识、制定城建档案管理的信息化与数字化规划、主动搭建统一高效的数字化档案管理平台、加强数据信息整合与开发利用、打造专业化的城建档案管理工作队伍、做好信息安全与数据防护工作,多措并举提升档案管理信息化水平,使城建档案在新媒体技术的赋能下发挥应有价值。

关键词：新媒体时代城建档案管理信息化现状分析对策研究

Demonstration of radar-aided flexible communication in a photonics-based W-band distributed integrated sensing and communication system for 6G

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Chinese Optics Letters 2024年第4期22卷 119-124页

作者：贾俊连董博宇陶理施剑阳迟楠张俊文 Key Laboratory of EMW Information(MoE) Fudan UniversityShanghai 200433China Shanghai ERC of LEO Satellite Communication and Applications Shanghai CIC of LEO Satellite Communication TechnologyShanghai 200433China Science and Technology on Electromagnetic Compatibility Laboratory China Ship Development and Design CentreWuhan 430000China Peng Cheng Laboratory Shenzhen 518055China

This paper experimentally demonstrates a distributed photonics-based W-band integrated sensing and communication(ISAC) system, in which radar sensing can aid the communication links in alignment and data rate estimation. As a proof-of-concept, the ISAC system locates the users, guides the alignment, and sets a communication link with the estimated highest data rate. A peak net data rate of 68.6 Gbit/s and a target sensing with a less-than-1-cm error and a sub-2-cm resolution have been tested over a 10-km fiber and a 1.15-m free space transmission in the photonics-based W-band ISAC system. The achievable net data rates of the users at different locations estimated by sensing are experimentally verified.

关键词： integrated sensing and communication photonics-aided technique W-band radar-aided flexible communication

基于波前整形和自适应光学的水下可见光通信系统

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重庆邮电大学学报（自然科学版） 2024年第1期36卷 166-171页

作者：陈超旭徐迟施剑阳迟楠复旦大学电磁波信息科学教育部重点实验室上海200433

为了解决水下可见光通信中复杂的水下湍流、散射环境对光束造成的畸变而导致信号传输失败的问题,使用随机相位屏方法模拟了水下湍流信道,在发射端对光束进行波前整形实现远距离聚焦,接收端使用自适应相位恢复算法对接收端光斑进行恢复。... 详细信息

为了解决水下可见光通信中复杂的水下湍流、散射环境对光束造成的畸变而导致信号传输失败的问题,使用随机相位屏方法模拟了水下湍流信道,在发射端对光束进行波前整形实现远距离聚焦,接收端使用自适应相位恢复算法对接收端光斑进行恢复。在1.2 m水下实验平台使用比特功率加载技术发射离散多音信号(discrete multi-tone, DMT)信号测量接收光功率与数据传输速率的对应关系,基于此,预测了100 m湍流环境下可见光信号的传输速率,与经过波前整形以及自适应相位恢复后的结果对比得到,所提出的方法可以使得水下可见光系统的传输速率得到极大提升。

关键词：水下可见光通信波前整形随机相位屏湍流自适应光学

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高速相干频分复用无源光网络系统辅助管理和控制通道传输与性能

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光学学报 2024年第8期44卷 1-8页

作者：申王伟王佳叶李国强邢思哲颜安李忠亚施剑阳迟楠张俊文复旦大学信息科学与工程学院电磁波信息科学教育部重点实验室上海200433

为了在保持帧结构完整性的同时,低代价地传输管理和控制信号,提出面向高速频分复用相干无源光网络(FDM-CPON)的两种传输管理和控制信号传输机制,即数字端辅助管理和控制通道(AMCC)和数据通道的相加和相乘。通过将AMCC传输的通断键控(OOK... 详细信息

为了在保持帧结构完整性的同时,低代价地传输管理和控制信号,提出面向高速频分复用相干无源光网络(FDM-CPON)的两种传输管理和控制信号传输机制,即数字端辅助管理和控制通道(AMCC)和数据通道的相加和相乘。通过将AMCC传输的通断键控(OOK)信号映射为数据通道信号幅值的变化,完成数据通道信号幅值再调制,成功将AMCC与数据通道相结合,实现了管理和控制信号与数据通道信号的同步传输。实验结果表明,在基于16QAM传输20 km光纤的200 Gbit/s FDM-CPON系统中,当AMCC的带宽和调制因子(MI)相同时,乘性AMCC对于信号性能的影响更小,自身传输信号的质量也更高。在AMCC的MI为26.1%、带宽为24.4 MHz时,乘性AMCC对信号灵敏度的惩罚比加性AMCC小3 dB。以上研究为未来高速相干频分复用无源光网络AMCC传输与系统设计提供重要参考。

关键词：光通信相干无源光网络相干光通信光纤通信频分复用辅助管理和控制通道

Geometrically Shaped 32QAM and Modified Binary Switching Coding Method in Underwater Visible Light Communication

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Chinese Journal of Electronics 2022年第6期31卷 1106-1111页

作者： shi jianyang CAI Jifan QIN Guojin JIN Ruizhe LIN Xianhao CHI Nan Key Laboratory for Information Science of Electromagnetic Waves (MoE) Fudan University Peng Cheng Laboratory Shanghai Engineering Research Center of Low-Earth-Orbit Satellite Communication and Applications Shanghai Collaborative Innovation Center of Low-Earth-Orbit Satellite Communication Technology

Visible light communication(VLC) has emerged as a promising communication method in 6G,particularly in the domain of underwater ***, because of its intimate coupling to the lightemitting diodes(LED), the transmission rate is limited by the modulation bandwidth and the nonlinearity of the LED. With current device development, LED bandwidth is substantially lower than that of other optical communication devices, necessitating improved spectral efficiency and nonlinearity robustness to achieve high-speed transmission. In this paper, we propose a hexagonal constellation-based geometrically shaped(GS) 32QAM with carrierless amplitude and phase(CAP) modulation for the underwater VLC system. A comprehensive performance comparison of four GS modulation methods, including our proposed hexagonal-32QAM, normal 32QAM, square-32QAM and 32APSK is investigated in both theory and experiment. The hexagonal-32QAM with a modified binary switching coding(BSC) can obtain a Q factor gain of 0.44 dB, and a data rate improvement of 25 Mb/s compared with Gary coding based normal 32QAM. The experimentally results illustrate the feasibility of geometric shaping 32QAM in underwater visible light communication.

关键词： Visible light communication Geometric shaping Quadrature amplitude modulation

Low-cost,large-coverage,and high-flexibility coherent PON for next-generation access networks:advances,challenges,and prospects[Invited]

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Chinese Optics Letters 2024年第4期22卷 26-35页

作者：邢思哲张俊文申王伟颜安李国强孙奥龙周骥郭栋施剑阳李子薇沈超迟楠 Key Laboratory of EMW Information(MoE) Fudan UniversityShanghai 200433China Department of Communication Science and Engineering Shanghai ERC of LEO Satellite Communication and ApplicationsShanghai CIC of LEO Satellite Communication TechnologyFudan UniversityShanghai 200433China Department of Electronic Engineering Jinan UniversityGuangzhou 510632China School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China

Increasing bandwidth requirements have posed significant challenges for traditional access *** is difficult for intensity modulation/direct detection to meet the power budget and flexibility requirements of the next-generation passive optical network(PON)at 100G and beyond considering the new *** is driving researchers to develop novel optical access ***-cost,wide-coverage,and high-flexibility coherent PON is emerging as a strong contender in the *** this article,we will review technologies that reduce the complexity of coherent PON(CPON),enabling it to meet the commercial ***,advanced algorithms and architectures that can enhance system coverage and flexibility are also discussed.

关键词： access network coherent optics flexible data rate low complexity wide dynamic range