介绍了LED(发光二极管)可见光通信系统和波分复用技术的原理, 利用Optisystem软件设计了波分复用技术在可见光通信链路传输中的系统结构, 实现了光路百兆级的实时通信。采用直接调制方式, 对NRZ(非归零)码和RZ(归零)码调制方式下的传输性能进行了对比研究, 分析了不同速率对系统的误码率和Q因子等因素的影响, 进而讨论了在不同传输距离下系统误码率的变化特性, 验证了波分复用技术应用在LED可见光通信系统中的可行性和稳定性。

In this paper, we first introduce the principle of LED based visible light communication system and wavelength division multiplexing technology. Then we design the system structure of real-time visible light communication link with wavelength division multiplexing technology based on Optisystem software. Under the direct modulation scheme, the transmission performances of NRZ and RZ modulation are studied, respectively. The effects of different data rates on the bit error rate and Q factor of the system are analyzed. The performances of bit error rate at different transmission distance are also discussed. Finally, the feasibility and stability of the wavelength division multiplexing technology in the visible light communication system are verified.