Li Honglei, Chen Xiongbin, Guo Junqing, Chen Hongda
Opt Express. 2014 Nov 3;22(22):27203-13. doi: 10.1364/OE.22.027203.
In this paper, we first experimentally demonstrate a 550 Mbit/s real-time visible light communication (VLC) system based on nonreturn-to-zero on-off keying (NRZ-OOK) modulation of a commercial phosphorescent white light LED. The 3-dB modulation bandwidth of such devices is only a few megahertz. We proposed an analog pre-emphasis circuit based on NPN transistors and an active post-equalization circuit based on an amplifier to enhance the 3-dB bandwidth of VLC link. Utilizing our proposed pre-emphasis and post-equalization circuits, the 3-dB bandwidth of VLC link could be extended from 3 to 233 MHz with blue-filter, to the best of our knowledge, which is the highest ever achieved in VLC systems reported. The achieved data rate was 550 Mbit/s at the distance of 60 cm and the resultant bit-error-ratio (BER) was 2.6 × 10(-9). When the VLC link operated at 160 cm, the data rate was 480 Mbit/s with 2.3 × 10(-7) of BER. Our proposed VLC system is a good solution for high-speed low-complexity application.
在本文中，我们首先通过实验演示了一种基于商用磷光白光发光二极管的非归零开关键控（NRZ-OOK）调制的550 Mbit/s实时可见光通信（VLC）系统。此类器件的3 dB调制带宽仅为几兆赫兹。我们提出了一种基于NPN晶体管的模拟预加重电路和一种基于放大器的有源后均衡电路，以提高VLC链路的3 dB带宽。据我们所知，利用我们提出的预加重和后均衡电路，VLC链路的3 dB带宽在使用蓝色滤光片时可从3 MHz扩展到233 MHz，这是已报道的VLC系统中所达到的最高值。在60 cm的距离处实现的数据速率为550 Mbit/s，所得误码率（BER）为2.6×10⁻⁹。当VLC链路在160 cm处运行时，数据速率为480 Mbit/s，BER为2.3×10⁻⁷。我们提出的VLC系统是高速低复杂度应用的良好解决方案。
