Study on the influence of LED PN junction area on modulation bandwidth in visible light communication

Zheng Zhou, Liu Li-lin, Gang Wang
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引用次数: 1

Abstract

In recent years, many researchers take great interest on visible light communication (VLC), due to its rich spectrum resources, no electromagnetic interference, good confidentiality, etc. In the visible light communication system, the information is loaded into the LED, then the light is transmitted in the free space, and the detector receives the signal. As the result of the −3dB modulation bandwidth of power-type LED is only several MHz, which affects seriously the information capacity and transmission. Therefore, the enhancement of the modulation bandwidth of LED is major task for VLC. In this paper, based on our previous work, the LED chip with different PN junction area of 200µm×800µm, 300µm×900µm and 300µm×1200µm are designed and fabricated. By analyzing the photoelectric characteristics and modulation characteristics of the three groups of LED, the relationship between PN junction area and modulation bandwidth are showed. Then the influence factors and the enhancement method of modulation bandwidth of power-type LED are proposed.
可见光通信中LED PN结面积对调制带宽影响的研究
近年来,可见光通信(VLC)以其频谱资源丰富、无电磁干扰、保密性好等优点引起了许多研究者的极大兴趣。在可见光通信系统中,信息被加载到LED中,然后光在自由空间中传输,探测器接收信号。由于功率型LED的- 3dB调制带宽只有几个MHz,严重影响了信息容量和传输。因此,提高LED的调制带宽是VLC的主要任务。本文在前人工作的基础上,设计并制作了不同PN结面积为200µm×800µm、300µm×900µm和300µm×1200µm的LED芯片。通过对三组LED的光电特性和调制特性的分析,得出了PN结面积与调制带宽的关系。然后提出了功率型LED调制带宽的影响因素和增强方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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