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Volume  期 2，2026 2026年第卷第2期

    LIU Zhongxu, XIE Dawei, DAI Yurong, LI Yibin, WEI Zixian, LUO Mingyu, YU Changyuan

    DOI：10.13756/j.gtxyj.2026.260050
    摘要：For emerging scenarios such as high-speed indoor access, short-reach interconnects, and display-communication convergence, Visible Light Communication (VLC) is shifting from “illumination with added communication” toward a parallel information-bearing platform centered on emitter arrays. Leveraging scalable array integration, spatial reuse, and the potential for on-chip interconnects, Micro-Light-Emitting Diodes (Micro-LED) enable the transmitter to evolve from a single-point source into a programmable parallel emitting front end and have become a key enabler for the engineering deployment of high-speed VLC. Following a “mechanism-device-system” storyline, this review summarizes recent advances in high-speed Micro-LED devices and Micro-LED-based VLC systems. We elucidate the physical origins of electro-optical bandwidth and the regime-dependent transition of dominant limiting factors with device size and injection conditions. We then investigate the acceleration strategies including crystal-orientation and polarization engineering, quantum-well/barrier and electron-blocking-layer designs, doping and strain-induced band engineering, and sidewall-damage suppression and passivation, highlighting their trade-offs between bandwidth-efficiency and optical power. Furthermore, we outline system-level techniques such as spectrally efficient modulation, equalization and predistortion, array-based parallel transmission, and multi-dimensional multiplexing. We also discuss remaining bottlenecks and trends at both device and system levels, providing guidance for future co-optimization and practical deployment.  
    关键词：Micro-LED;VLC;short-reach interconnects;parallel optical interconnects;emitter arrays   
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    更新时间：2026-04-20

    JIANG Wei, LI Wendi, YIN Huiping, LI Xin

    DOI：10.13756/j.gtxyj.2026.250393
    摘要：ObjectiveTo address the severe performance degradation caused by strongly scattering smoke environments on Visible Light Communication (VLC) in scenarios such as fire rescue and mine detection, this paper studies a smoke-environment VLC system based on micro-Light-Emitting Diode (LED). It aims to overcome the communication bottleneck of traditional light sources in strongly scattering environments. It also provide a technical solution for emergency scenarios in 6th Generation Mobile Communication Technology (6G) networks and integrated applications of communication and sensing.MethodsA Micro-LED transmitter based on an InGaN/GaN Multiple Quantum Well (MQWs) structure was developed. A Beer-Lambert channel model suitable for smoke VLC was established, and its attenuation characteristics were verified through simulation. Using a controllable smoke experimental platform combined with a dual-lens optical system to optimize beam focusing, the optical utilization efficiency was improved to 85%. Simultaneously, the absorbance differences under clear conditions and different smoke concentrations were compared and analyzed. A communication performance test platform for the smoke VLC system was built, and its performance was measured.ResultsThe Micro-LED transmitter achieved a 3.39 MHz modulation bandwidth, a maximum transmission rate of 25 Mbit/s, and a power consumption of 10~50 mW. Under light smoke conditions (1.4 g smoke cake), with a 70% signal power attenuation, the system maintained stable communication with an eye diagram opening greater than 50%. Under heavy smoke conditions (2.6 g smoke cake), with an 85% signal power attenuation, stable and reliable communication was still achieved, realizing the integration of communication and environmental sensing functions.ConclusionThis paper pioneers the application of Micro-LEDs in visible light communication within smoke environments. Under heavy smoke conditions, stable transmission is still achievable even with an 85% signal power attenuation, solving the long-standing problem of light sources struggling to maintain stable transmission in strongly scattering environments. The established Beer-Lambert channel model provides a reference for the hardware design and optimization of smoke VLC systems. The experiments demonstrate that smoke concentration can be quantitatively inferred by analyzing received signals, verifying the advantages of Micro-LEDs in the field of 6G integrated sensing and communication. This technology can be applied to emergency scenarios such as fire rescue and mine monitoring.  
    关键词：VLC;Micro-LED;6G;smoke environment;integrated sensing and communication   
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    更新时间：2026-04-20

    GUO Xinyue, WANG Yue, YANG Yufan

    DOI：10.13756/j.gtxyj.2026.260053
    摘要：ObjectiveVisible Light Communication (VLC) is a wireless communication technology that uses the visible light band for signal transmission, integrating both lighting and communication functions. It has advantages such as abundant spectrum resources, freedom from electromagnetic interference, high security, and low cost. It is regarded as an important supplement to radio frequency communication in the 6th Generation Mobile Communication Technology (6G) era. In VLC systems, the nonlinear distortion of Light-Emitting Diode (LED) is a key factor limiting system performance.MethodsThe spiral constellation is an approximately circular constellation structure with excellent nonlinear resistance. Its performance can be further improved when combined with Probabilistic Shaping (PS) technology. However, the amplitudes of each constellation point in the spiral constellation are different, resulting in an excessive number of probability types for PS signals following the Maxwell-Boltzmann (MB) distribution, which leads to extremely high complexity in PS signal generation. To address this issue, a PS spiral constellation scheme for the 64-order spiral constellation is proposed in this paper. The scheme groups constellation points according to the spiral constellation structure. The constellation points in the same group are assigned the same amplitude, thus corresponding to the same probability.ResultsThe proposed scheme not only significantly reduces the complexity of PS signal generation but also achieves better nonlinear resistance due to a lower Peak-to-Average Power Ratio (PAPR). Experimental results show that, compared with the conventional square PS 64 Quadrature Amplitude Modulation (QAM) and the PS spiral constellation scheme using 64 probabilities, when the LED operates in the nonlinear region, the proposed PS spiral constellation exhibits obvious advantages in Normalized Generalized Mutual Information (NGMI) performance and also has a wider dynamic operating range of Peak-to-Peak Voltage (Vpp) value.ConclusionThe results are of great significance for visible light communication systems operating under high-power conditions, and can provide theoretical references and technical support for their performance optimization and practical applications.  
    关键词：VLC;geometric shaping;spiral constellation;PS   
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    更新时间：2026-04-20

    LI Zongyan, GAO Han, XU Yue, HOU Wenbin, LI Shiyin

    DOI：10.13756/j.gtxyj.2026.260014
    摘要：ObjectiveThe paper aims to address the limitations of hybrid Optical-Orthogonal Frequency Division Multiplexing (O-OFDM) schemes, such as Layered Asymmetric Clipped Optical Orthogonal Frequency Division Multiplexing (LACO-OFDM), within Visible Light Communication (VLC) systems. These schemes introduce clipping distortion due to non-orthogonal signal superposition and necessitate iterative detection methods like Successive Interference Cancellation (SIC), resulting in large receiver complexity. This paper proposes an improved Multilayer Hybrid O-OFDM (MHO-OFDM) scheme to achieve a more balanced trade-off between spectral efficiency and receiver complexity.MethodsFirstly, this scheme maps Quadrature Amplitude Modulation (QAM) symbols and multi-level Pulse Amplitude Modulation (PAM) symbols onto frequency-domain subcarriers according to specific rules to achieve high spectral efficiency. Secondly, a positive-symmetric signal is introduced onto idle subcarriers to satisfy non-negative transmission constraints. This signal introduces no interference to active subcarriers and eliminates the iterative noise clipping process required in traditional hierarchical schemes, enabling low-complexity signal detection at the receiver side.ResultsSimulation results show that the proposed MHO-OFDM scheme exhibits overall superiority over existing O-OFDM approaches in terms of Peak-to-Average Power Ratio (PAPR), whilst simultaneously delivering significant performance advantages in error rate under conditions of nonlinear distortion.ConclusionIn summary, MHO-OFDM enhances spectral efficiency while effectively reducing receiver complexity, offering a technically viable solution with potential application value for constructing VLC systems characterised by high spectral efficiency and low complexity.  
    关键词：VLC;O-OFDM;PAPR;complexity   
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    更新时间：2026-04-20
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   Study on Optical Communications

 

 

 

 

 

 

 

Bimonthly, started in 1975

Governed by，China Information Communication Technologies Group Corporation (CICT)

Sponsored by：Wuhan Research Institute of Post & Telecommunications Co., Ltd.

Publisher：Editorial Department of Study on Optical Communications

 

Honorary Editor-in-Chief：YU Shao-hua

Editor-in-Chief：LI Han-bing

Executive Editor-in-Chief：XIAO Xi

Director：WANG Xi

 

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Zip Code: 430205

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ISSN：1005-8788

CN：42-1266/TN

 

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