大气光传输信道的闪烁与脉冲畸变测量研究

陈纯毅; 倪小龙; 刘智; 杨华民; 任斌; 徐春凤

doi:10.3788/OPE.20162413.0330

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大气光传输信道的闪烁与脉冲畸变测量研究

更新时间：2020-08-13

- 大气光传输信道的闪烁与脉冲畸变测量研究
- Research on scintillation and pulse distortion measurement of atmospheric optical transmission channel
- 光学精密工程 2016年24卷第10s期页码：330-337
- 作者机构：
  
  长春理工大学光电测控与光信息传输技术教育部重点实验室,吉林长春,130022
- 作者简介：
- 基金信息：
  
  国家自然科学基金资助项目（No.61007046，No.61275080，No.61475025）();教育部博士点专项基金资助项目（No.20132216110002
- DOI：10.3788/OPE.20162413.0330
  中图分类号： TN929.13
- 收稿日期：2016-05-10，
  
  修回日期：2016-06-15，
  
  纸质出版日期：2016-11-14
- 稿件说明：
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陈纯毅, 倪小龙, 刘智等. 大气光传输信道的闪烁与脉冲畸变测量研究[J]. 光学精密工程, 2016,24(10s): 330-337

CHEN Chun-yi, NI Xiao-long, LIU Zhi etc. Research on scintillation and pulse distortion measurement of atmospheric optical transmission channel[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 330-337
陈纯毅, 倪小龙, 刘智等. 大气光传输信道的闪烁与脉冲畸变测量研究[J]. 光学精密工程, 2016,24(10s): 330-337 DOI： 10.3788/OPE.20162413.0330.

CHEN Chun-yi, NI Xiao-long, LIU Zhi etc. Research on scintillation and pulse distortion measurement of atmospheric optical transmission channel[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 330-337 DOI： 10.3788/OPE.20162413.0330.

摘要

为了分析大气对光信号传输的影响，研究了有限孔径接收光功率闪烁和脉冲时域波形畸变测量方法，建立了测量数据的数学分析模型。在相距6.2 km的两栋高楼之间开展激光传输测量实验，用CCD传感器探测离焦的接收光斑图像，用高带宽数字示波器记录接收脉冲时域波形。基于记录的光斑图像和脉冲波形数据，分别分析不同尺寸的虚拟圆形孔径接收光功率闪烁概率密度分布和接收光脉冲时域波形畸变。结果表明：用Nakagami分布描述较弱的接收光功率起伏比用对数正态分布更精确；负指数分布可用于描述很强的接收光功率起伏；当发射重复频率为100 MHz的矩形脉冲序列时，发射脉冲时域波形频谱中大于或等于0.48 GHz的旁瓣峰传到接收端后基本上完全消失，脉冲强度峰值出现在发射矩形脉冲的下降沿传输到接收端的时刻，脉冲强度时间分布发生明显扩展。

Abstract

To analyze the influence of atmosphere on optical signal transmission

the methods of measuring scintillation in the optical power received by a finite aperture and temporal pulse-waveform distortion have been researched

and the mathematical model for analyzing the measurement data has been established. Between two tall buildings standing 6.2 km apart

the measurement experiment on laser transmission has been carried out; a CCD sensor is used to detect the received optical pattern images

which are defocused; a high bandwidth digital oscilloscope is used to record the temporal waveform of received pulses. Based on the recorded pattern images and pulse waveforms

the probability density distribution of the optical-power scintillationreceived by a virtual circular aperture and the temporal waveform distortion of received optical pulses have been analyzed

respectively. It is shown that:the Nakagami distribution is more accurate than the lognormal distribution for characterizing relatively weak fluctuations in the received optical power; the negative exponential distribution can be appropriately used to describe very strong fluctuations in the received optical power; for a rectangular pulse train transmitted at a repetition rate of 100 MHz

the side lobes in the frequency spectrum of the transmitted temporal pulse waveform with a frequency related to their peaks equal to or larger than 0.48 GHz almost completely disappear when the pulses arrive at the receiver end

and meanwhile obvious spreading of the temporal intensity distribution of a single pulse can be observed with the peak intensity occurring at the moment when the trailing edge of the transmitted pulse reaches the receiver end.

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