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.

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.

Scintillation index of flat-topped Gaussian beams

2006 ◽  
Vol 45 (16) ◽  
pp. 3793 ◽  
Author(s):  
Yahya Baykal ◽  
Halil T. Eyyuboğlu
Keyword(s):  
Scintillation Index ◽  
Gaussian Beams

Gaussian beam migration

Geophysics ◽  
1990 ◽  
Vol 55 (11) ◽  
pp. 1416-1428 ◽  
Author(s):  
N. Ross Hill
Keyword(s):  
Gaussian Beam ◽  
Wave Field ◽  
Seismic Source ◽  
Velocity Model ◽  
Downward Continuation ◽  
Gaussian Beams ◽  
Seismic Velocities ◽  
Migration Method ◽  
Gaussian Beam Migration ◽  
Lateral Variations

Just as synthetic seismic data can be created by expressing the wave field radiating from a seismic source as a set of Gaussian beams, recorded data can be downward continued by expressing the recorded wave field as a set of Gaussian beams emerging at the earth’s surface. In both cases, the Gaussian beam description of the seismic‐wave propagation can be advantageous when there are lateral variations in the seismic velocities. Gaussian‐beam downward continuation enables wave‐equation calculation of seismic propagation, while it retains the interpretive raypath description of this propagation. This paper describes a zero‐offset depth migration method that employs Gaussian beam downward continuation of the recorded wave field. The Gaussian‐beam migration method has advantages for imaging complex structures. Like finite‐difference migration, it is especially compatible with lateral variations in velocity, but Gaussian beam migration can image steeply dipping reflectors and will not produce unwanted reflections from structure in the velocity model. Unlike other raypath methods, Gaussian beam migration has guaranteed regular behavior at caustics and shadows. In addition, the method determines the beam spacing that ensures efficient, accurate calculations. The images produced by Gaussian beam migration are usually stable with respect to changes in beam parameters.

scholarly journals RELAY PROPAGATION OF PARTIALLY COHERENT COSH-GAUSSIAN BEAMS IN NON-KOLMOGOROV TURBULENCE

2012 ◽  
Vol 131 ◽  
pp. 495-515 ◽  
Author(s):  
Rumao Tao ◽  
Lei Si ◽  
Yanxing Ma ◽  
Pu Zhou ◽  
Zejin Liu
Keyword(s):  
Gaussian Beams ◽  
Partially Coherent ◽  
Kolmogorov Turbulence

scholarly journals Joint measurements of optical parameters by irradiance scintillation and angle-of-arrival fluctuations

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 387-393
Author(s):  
Chao Gao ◽  
Haodong Liang ◽  
Xiaofeng Li
Keyword(s):  
Error Analysis ◽  
Atmospheric Turbulence ◽  
Power Law ◽  
Structure Constant ◽  
Simultaneous Equations ◽  
Scintillation Index ◽  
Optical Parameters ◽  
Angle Of Arrival ◽  
Power Law Exponent

AbstractA method for joint measuring the power law exponent and the structure constant of atmospheric turbulence is proposed and examined. The measurements are equivalent to solve the simultaneous equations formed by the irradiance scintillation index and the angle-of-arrival fluctuations variance, where the measured parameters are regarded as the unknowns. The measured error analysis is also presented. Based on our proposed method, the measured results accord with the daily trend of atmospheric turbulence.

Propagation Properties of HermiteGaussian Beams in NonKolmogorov Turbulence

2012 ◽  
Vol 41 (7) ◽  
pp. 818-823 ◽  
Author(s):  
黄永平 HUANG Yongping ◽  
曾安平 ZENG Anping
Keyword(s):  
Gaussian Beams ◽  
Kolmogorov Turbulence ◽  
Propagation Properties
Sign in / Sign up

Export Citation Format

Share Document