紫外光通信技术具有低窃听、低位辨、全方位、全天候、抗干扰等优点, 而基于紫外光灯的通信系统存在光源体积大、易碎、调制困难、通信速率低、功耗大等问题。设计了一种基于紫外C波段(UVC)LED的小型化无线通信系统方案, 并对系统性能进行了理论分析。系统光源采用UVC LED, 探测器采用日盲光电倍增管(PMT)和窄带紫外滤光片, 通信系统采用开关键控(OOK)和脉冲位置调制(PPM)调制方案。仿真结果表明所设计的紫外无线通信系统可在200 mW发射光功率情况下实现直径200 m范围内的非视距语音通信和100 mW发射光功率情况下实现250 m的64 Kbps准视距通信。

Ultraviolet(UV) communication has the advantages of anti-wiretapping, low detectability, omni-direction, all-weather adaption, and high anti-jamming, while the low pressure mercury lamps based UV communication system has the shortcomings of bulky, frangibility, difficult to modulate, low data rate and low communication speed. A deep UV LED based UV communication system is proposed and related theoretical analyses are progressed. UVC LED and photomultiplier tube(PMT) are used as system transceiver. This system takes On-Off Keying modulation and pulse position modulation(PPM) technologies. The simulation results show that the UVC LED-based portable ultraviolet wireless communication system can achieve non-line of sight(NLOS) voice communication with 200 mW transmit optical power in 200 meters range and quasi line-of-sight(QLOS) 64 Kbps communication with 100 mW transmit optical power 250 meters range.