弱湍流环境下自由空间光通信系统性能研究

Research on the Performance of Free Space Optical Communications Systems under Weak Turbulence

自由空间光(Free Space Optical, FSO)通信技术具有高传输容量、免频谱许可、高保密性等优点,然而对于大气激光通信,光束在传输路径上普遍存在大气状况对通信性能的影响,大气湍流会大大降低接受信号的质量。文章设计了一套室内无线激光通信实验系统,模拟真实环境下的大气湍流,并细致分析了如何在室内模拟和测量大气湍流强度,同时提出两种测量室内弱湍流强度的方法并进行对比。文章的成果可用于无线激光通信系统误码率的研究,为无线激光通信系统性能及相关调制技术奠定了一定的理论基础。

Free-space optical(FSO) communication technology offers a huge license-free frequency spectrum and high security.A major challenge facing FSO systems in clear atmosphere is the effect of turbulence induced irradiance fluctuation on the system performance. This paper develops an experimental test-bed to validate the atmospheric turbulence fading effects on the FSO system. The results of this paper can be used to study the bit error rate of wireless laser communication system, and lay a theoretical foundation for the performance of laser communication system and related modulation technology.