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无人机全光中继系统误码率性能分析 被引量:1
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作者 唐翰玲 李勇军 +1 位作者 邵龙 韩健 《激光与红外》 CAS CSCD 北大核心 2023年第7期1066-1072,共7页
研究了大气湍流信道下无人机全光中继(optical amplify-and-forward,OAF)激光通信的误码率性能。为了减小大气湍流的影响,改善系统的误码率性能,同时实现较远距离的数据下传,本文基于掺饵光纤放大器(Erbium Droped Fiber Amplifier,EDFA... 研究了大气湍流信道下无人机全光中继(optical amplify-and-forward,OAF)激光通信的误码率性能。为了减小大气湍流的影响,改善系统的误码率性能,同时实现较远距离的数据下传,本文基于掺饵光纤放大器(Erbium Droped Fiber Amplifier,EDFA)和光学硬限制器(optical hard-limiter,OHL)结合的无人机平台,同时采用高空水平传输和单输入多输出(single input multiple output,SIMO)技术斜程传输的两跳中继模式。在基于正态分布和双伽马(Gamma-Gamma)湍流模型下,分析了指向误差、中继距离、天顶角、束散角及平台高度等对误码率性能的影响。仿真结果表明,无人机OAF系统可以有效改善较远距离通信的数据下传误码率性能;当发射功率P_(t)=19 dBm,阈值功率P_(th)=-31 dBm,N=3时,最优发散角为0.8~1.2 mrad,天顶角控制在45°内时,可以在6 km的中继系统中得到10^(-6)系统误码率性能。 展开更多
关键词 激光通信 无人机 全光中继 大气湍流 误码率
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An all-optical time-delay relay based on a bacteriorhodopsin film
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作者 陈桂英 许旭旭 +2 位作者 张春平 祁胜文 宋奇望 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第11期4218-4225,共8页
Using a special property of dynamic complementary-suppression-modulated transmission (DCSMT) in the bacteriorhodopsin (bR) film, we have demonstrated an all-optical time-delay relay. To extend our work, the relati... Using a special property of dynamic complementary-suppression-modulated transmission (DCSMT) in the bacteriorhodopsin (bR) film, we have demonstrated an all-optical time-delay relay. To extend our work, the relationship between the delay time of the all-optical time-delay relay and parameters of a bR film is numerically studied. We show how the delay time changes with the product of concentration and thickness (PCT) of a bR film. Furthermore, the shortest and longest delay times are given for the relay of 'switch off. The saturable delay time and maximum delaytime of 'switch on' are also given. How the wavelengths (632.8, 568, 533 and 412 nm) and intensities of the illuminating light influence the delay time is also discussed. The simulation results are useful for optimizing the design of all-optical time-delay relays. 展开更多
关键词 bR film all-optical time-delay relay dynamic complementary-suppression-modulated transmission
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