摘要
为了给湍流介质中光学系统的工程设计和性能评估提供参考依据,分析对比了平面波与球面波的光强闪烁。首先,基于经典弱起伏湍流理论推导了孔径接收时光强闪烁的解析表达式。然后,基于扩展的Rytov理论计算非弱起伏条件下的光强闪烁。最后,仿真了不同湍流强度、不同菲涅耳数下平面波与球面波的光强闪烁。结果表明,当Rytov方差小于4.8时,平面波与球面波的光强闪烁曲线存在一个交点,该交点对应菲涅耳数下的平面波闪烁与球面波闪烁强度相等;当Rytov方差大于4.8时,平面波的光强闪烁强度总是小于球面波。该研究对于无线光通信系统中光学收发天线的设计、光束波长、波形的选择具有重要意义。
In this paper,the light intensity scintillations of plane wave and spherical wave are analyzed and compared for providing references for engineering design and performance evaluation of the optics system employed in turbulence medium.First,based on the classic weakly fluctuating turbulence theory,the analytical expression of the light intensity scintillation at aperture reception is derived.Then,based on the extended Rytov theory,the light intensity scintillation under nonweak fluctuation conditions is calculated.Finally,the light intensity scintillation of plane and spherical waves is simulated under various turbulence intensities and Fresnel numbers.The results show that when the Rytov variance is less than 4.8,an intersection point is present between the light intensity scintillation curves of the plane and spherical waves.The intensities of the plane and spherical wave scintillations under the Fresnel number corresponding to the intersection point are equal.When the Rytov variance is greater than 4.8,the light intensity scintillation of the plane wave is always less than that of the spherical wave.This research is of great significance for designing optical transceiver antennas and selecting beam wavelengths and waveforms in wireless optical communication systems.
作者
沈红
于龙昆
周玉修
周利玲
Shen Hong;Yu Longkun;Zhou Yuxiu;Zhou Liling(School of Science,Jiujiang University,Jiujiang,Jiangxi 332005,China;Information Engineering School,Nanchang University,Nanchang,Jiangxi 330031,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2021年第23期23-27,共5页
Laser & Optoelectronics Progress
基金
国家自然科学基金(42165007,61665004,41605007)。
关键词
大气光学
湍流介质光传输
孔径平滑闪烁
无线光通信
atmospheric optics
light propagation through turbulence medium
aperture-averaged scintillation
optical wireless communication
