31.38 Gb/s GaN-based LED array visible light communication system enhanced with V-pit and sidewall quantum well structure
采用V型坑和侧壁量子阱结构增强的31.38Gb/s GaN基LED阵列可见光通信系统
V型ピットと側壁量子井戸構造を強化した31.38 Gb/sGaNベースLEDアレイ可視光通信システム
V-구덩이 및 측벽 양자 함정 구조로 향상된 31.38Gb/s GaN 기반 LED 어레이 가시광선 통신 시스템
Sistema de comunicación de luz visible de matriz LED basada en 31.38gb / s Gan mejorado con estructura de pozo cuántico en forma de V y pared lateral
Système de communication par lumière visible à matrice LED à base de Gan de 31,38 GB / s renforcé par une structure à puits quantiques en V et à parois latérales
Система связи с видимым светом на основе светодиодной решетки на основе 31,38 Гбит / с с улучшенной структурой V - образной ямы и квантовой ловушки боковой стенки
Zengyi Xu 徐增熠 ¹ ⁴, Wenqing Niu 牛文清 ¹, Yu Liu 柳裕 ², Xianhao Lin 林显浩 ¹, Jifan Cai 蔡济帆 ¹, Jianyang Shi 施剑阳 ¹ ³, Xiaolan Wang 王小兰 ², Guangxu Wang 王光绪 ², Jianli Zhang 张建立 ², Fengyi Jiang 江风益 ², Zhixue He 贺志学 ⁴, Shaohua Yu 余少华 ⁴, Chao Shen 沈超 ¹, Junwen Zhang 张俊文 ¹, Nan Chi 迟楠 ¹ ³
¹ Key Laboratory for the Information Science of Electromagnetic Waves (MoE), Department of Communication Science and Engineering, Fudan University, Shanghai 200433, China
中国 上海 复旦大学电磁波信息科学教育部重点实验室
² National Institute of LED on Silicon Substrate, Nanchang University, Nanchang 330096, China
中国 南昌 南昌大学国家硅基LED工程技术研究中心
³ Shanghai Engineering Research Center of Low-Earth-Orbit Satellite Communication and Applications, and Shanghai Collaborative Innovation Center of Low-Earth-Orbit Satellite Communication Technology, Shanghai 200433, China
中国 上海 上海低轨卫星通信与应用工程技术研究中心 上海低轨卫星通信技术协同创新中心
⁴ Peng Cheng Laboratory, Shenzhen 518055, China
中国 深圳 鹏城实验室
Opto-Electronic Science, 28 July 2023

Although the 5G wireless network has made significant advances, it is not enough to accommodate the rapidly rising requirement for broader bandwidth in post-5G and 6G eras. As a result, emerging technologies in higher frequencies including visible light communication (VLC), are becoming a hot topic. In particular, LED-based VLC is foreseen as a key enabler for achieving data rates at the Tb/s level in indoor scenarios using multi-color LED arrays with wavelength division multiplexing (WDM) technology.

This paper proposes an optimized multi-color LED array chip for high-speed VLC systems. Its long-wavelength GaN-based LED units are remarkably enhanced by V-pit structure in their efficiency, especially in the “yellow gap” region, and it achieves significant improvement in data rate compared with earlier research. This work investigates the V-pit structure and tries to provide insight by introducing a new equivalent circuit model, which provides an explanation of the simulation and experiment results.

In the final test using a laboratory communication system, the data rates of eight channels from short to long wavelength are 3.91 Gb/s, 3.77 Gb/s, 3.67 Gb/s, 4.40 Gb/s, 3.78 Gb/s, 3.18 Gb/s, 4.31 Gb/s, and 4.35 Gb/s (31.38 Gb/s in total), with advanced digital signal processing (DSP) techniques including digital equalization technique and bit-power loading discrete multitone (DMT) modulation format.
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