scholarly journals Modulation Transfer Function of a Gaussian Beam Based on the Generalized Modified Atmospheric Spectrum

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Chao Gao ◽  
Xiaofeng Li
Keyword(s):  
Transfer Function ◽  
Gaussian Beam ◽  
Atmospheric Turbulence ◽  
Modulation Transfer Function ◽  
Spectral Power ◽  
Optical Parameters ◽  
Modulation Transfer ◽  
Negative Effects ◽  
Kolmogorov Turbulence ◽  
Inner Scale

This paper investigates the modulation transfer function of a Gaussian beam propagating through a horizontal path in weak-fluctuation non-Kolmogorov turbulence. Mathematical expressions are obtained based on the generalized modified atmospheric spectrum, which includes the spectral power law value of non-Kolmogorov turbulence, the finite inner and outer scales of turbulence, and other optical parameters of the Gaussian beam. The numerical results indicate that the atmospheric turbulence would produce less negative effects on the wireless optical communication system with an increase in the inner scale of turbulence. Additionally, the increased outer scale of turbulence makes a Gaussian beam influenced more seriously by the atmospheric turbulence.

scholarly journals Wave Structure Function and Long-Exposure MTF for Gaussian-Beam Waves Propagating in Anisotropic Maritime Atmospheric Turbulence

2020 ◽  
Vol 10 (16) ◽  
pp. 5484
Author(s):  
Bing Guan ◽  
Haiyang Yu ◽  
Wei Song ◽  
Jaeho Choi
Keyword(s):  
Structure Function ◽  
Gaussian Beam ◽  
Atmospheric Turbulence ◽  
Isotropic Turbulence ◽  
Imaging System ◽  
Wave Structure ◽  
Modulation Transfer ◽  
Horizontal Path ◽  
Kolmogorov Turbulence ◽  
Waves Propagation

The expressions of wave structure function (WSF) and long-exposure modulation transfer function (MTF) for laser beam propagation through non-Kolmogorov turbulence were derived in our previous work. In this paper, based on anisotropic maritime atmospheric non-Kolmogorov spectrum, the new analytic expression of WSF for Gaussian-beam waves propagation through turbulent atmosphere in a horizontal path is derived. Moreover, using this newly derived expression, long-exposure MTF for Gaussian-beam waves is obtained for analyzing the degrading effects in an imaging system. Using the new expressions, WSF and MTF for Gaussian-beam waves propagating in terrestrial and maritime atmospheric turbulence are evaluated. The simulation results show that Gaussian-beam waves propagation through maritime turbulence obtain more degrading effects than terrestrial turbulence due to the humidity and temperature fluctuations. Additionally, the degrading effects under anisotropic turbulence get less loss than that of isotropic turbulence.

scholarly journals Irradiance Scintillation Index for a Gaussian Beam Based on the Generalized Modified Atmospheric Spectrum with Aperture Averaged

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Chao Gao ◽  
Yang Li ◽  
Yiming Li ◽  
Xiaofeng Li
Keyword(s):  
Gaussian Beam ◽  
Direct Detection ◽  
Spectral Power ◽  
Scintillation Index ◽  
Gaussian Beams ◽  
Optical Parameters ◽  
Detection Scheme ◽  
Mathematical Expressions ◽  
Kolmogorov Turbulence ◽  
Point To Point

This paper investigates the aperture-averaged irradiance scintillation index of a Gaussian beam propagating through a horizontal path in weak non-Kolmogorov turbulence. Mathematical expressions are obtained based on the generalized modified atmospheric spectrum, which includes the spectral power law value of non-Kolmogorov turbulence, the finite inner and outer scales of turbulence, and other optical parameters of the Gaussian beam. The numerical results are conducted to analyze the influences of optical parameters on the aperture-averaged irradiance scintillation index for different Gaussian beams. This paper also examines the effects of the irradiance scintillation on the performance of the point-to-point optical wireless communication system with intensity modulation/direct detection scheme.

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