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Multibeam scintillation cumulative distribution function.

Jason A Tellez1, Jason D Schmidt

  • 1Department of Electrical and Computer Engineering, Air Force Institute of Technology, 2950 Hobson Way, Wright-Patterson AFB, Ohio 45433-7765, USA.

Optics Letters
|January 26, 2011
PubMed
Summary
This summary is machine-generated.

This study models irradiance from multiple laser beams through atmospheric turbulence using a novel gamma-gamma distribution approximation. The new analytic model accurately predicts scintillation, outperforming simulations.

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Area of Science:

  • Optical Engineering
  • Atmospheric Physics
  • Statistical Optics

Background:

  • Scintillation, or intensity fluctuation, of laser beams in atmospheric turbulence is often modeled using the gamma-gamma probability density function.
  • Reducing scintillation typically involves using multiple independent laser beam paths.

Purpose of the Study:

  • To develop the first analytic model for irradiance distribution from multiple independent laser beams propagating through atmospheric turbulence.
  • To leverage a recent closed-form approximation for the sum of independent, identically distributed gamma-gamma random variables.

Main Methods:

  • Utilized a novel, accurate, closed-form approximation for the sum of independent, identically distributed gamma-gamma random variables.
  • Derived an analytic model for the irradiance distribution of multiple independent beams based on this approximation.

Main Results:

  • Presented a new analytic model for the distribution of irradiance from multiple independent laser beams.
  • The developed model demonstrated favorable comparison with wave-optics simulations.

Conclusions:

  • The new analytic model provides an accurate method for predicting irradiance distribution in multi-beam atmospheric optical communication systems.
  • This work advances the understanding and modeling of laser beam propagation through atmospheric turbulence.