基于复合相位屏的光传输多孔径接收特性研究

Research on multi-aperture receiving characteristics of optical transmission based on composite phase plate

多孔径接收技术可以有效抑制无线激光通信中的光强闪烁,然而接收孔径的直径、间距以及个数对于改善无线激光通信性能的作用规律目前还尚不清晰完备。因此,提出一种基于复合相位屏的光传输方法,并对多孔径接收特性进行了研究。首先,将功率谱反演法和zernike倾斜方法相结合以生成复合相位屏,并构建了光传输多孔径接收的数学模型;然后,改变接收孔径的直径、间距以及个数,统计接收端光强闪烁的变化情况;最后,在不同的大气折射率结构常数、光波波长、传输距离的实际光传输场景下,分析了多孔径接收光强闪烁的变化规律。结果表明,当大气折射率结构常数从2.231 3×10^(-16) m^(-2/3)减小至1.5 81 2×10^(-17) m^(-2/3),5个孔径直径为0.2 m,孔径间距为0.4 m的接收孔径的光强闪烁从0.2032减小到0.0524;当光波波长由532 nm变为1550 nm,5个孔径直径为0.14 m,孔径间距为0.4 m的接收孔径的光强闪烁从0.2696减小到0.1982;当传播距离从7×10^(3) m增大到7×10^(5) m,5个孔径直径为0.2 m,孔径间距为0.4m的接收孔径的光强闪烁从0.0043增大到0.3239,该项研究总结了无线激光通信的多孔径接收特性的规律。

Multi-aperture receiving technology can effectively suppress intensity scintillation in wireless laser communication.However,the effect of the diameter,spacing and number of receiving aperture on improving the performance of wireless laser communication is not clear and complete.Therefore,an optical transmission method based on composite phase screen was proposed,and the characteristics of multi-aperture reception were studied.Firstly,the power spectrum inversion method was combined with Zernike tilt method to generate a composite phase screen,and the mathematical model of optical transmission multi-aperture reception was constructed.Then,the diameter,spacing and number of receiving aperture were changed to calculate the change of intensity scintillation at the receiving end.Finally,the variation of multi-aperture received intensity scintillation was analyzed under the actual optical transmission scenario with different atmospheric refractive index structure constants,wavelengths and transmission distances.The results show that the intensity scinti-llation of five receiving apertures with diameters of 0.2 m and aperture spacing of 0.4 m decreases from 0.2032 to 0.0524 when the structure constant of atmospheric refractive index decreases from 2.2313×10^(-16) m^(-2/3) to 1.5812×10^(-17) m^(-2/3).When the wavelength of light wave changes from 532 nm to 1550 nm,the intensity scintillation of five receiving apertures with diameters of 0.2 m and apertures spacing of 0.4 m decreases from 0.2165 to 0.1523.When the propagation distance increases from 7×10^(3) m to 7×10^(5) m,the intensity scinti-llation of five receiving apertures with diameters of 0.2 m and aperture spacing of 0.4 m increases from 0.0043 to 0.3239.This study summarizes the law of multi-aperture receiving characteristics of wireless laser comm-unication.