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Related Experiment Videos

Atmospheric optical communication with a Gaussian Schell beam.

Jennifer C Ricklin1, Frederic M Davidson

  • 1U.S. Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20723, USA. jricklin@arl.army.mil

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|May 16, 2003
PubMed
Summary

Reducing spatial coherence in wireless optical communication links significantly lowers bit error rates. This finding aids in optimizing beam and aperture sizes for better performance under atmospheric turbulence.

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Area of Science:

  • Optical communication
  • Atmospheric optics
  • Laser physics

Background:

  • Wireless optical communication links are susceptible to atmospheric turbulence.
  • Gaussian Schell beams are commonly used laser sources in these systems.
  • Source spatial coherence impacts signal quality and error rates.

Purpose of the Study:

  • To analyze the influence of atmospheric turbulence and source coherence on aperture averaging and bit error rate.
  • To derive analytical expressions for irradiance fluctuations and log-intensity variance.
  • To identify conditions for enhanced aperture averaging.

Main Methods:

  • Derivation of analytic expressions for spatial covariance and log-intensity variance.
  • Analysis of Gaussian Schell beams in the weak fluctuation regime.

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  • Examination of varying degrees of source spatial coherence.

    • Main Results:

    • Reduced spatial coherence leads to decreased intensity fluctuations (scintillations).
    • Lower scintillations result in a significant reduction in the average bit error rate.
    • Enhanced aperture averaging observed in focused coherent and collimated/divergent partially coherent beams.

    Conclusions:

    • Source spatial coherence is a critical parameter for optimizing wireless optical communication performance.
    • The derived expressions serve as a design tool for system optimization.
    • Tailoring beam and aperture characteristics can mitigate atmospheric turbulence effects.