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Optical Engineering

Strehl ratio and scintillation theory for uplink Gaussian-beam waves: beam wander effects
Author(s): Larry C. Andrews; Ronald L. Phillips; Richard J. Sasiela; Ronald R. Parenti
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Paper Abstract

First-order weak-fluctuation Rytov theory predicts that the longitudinal (on-axis) component of the scintillation index of an uplink collimated beam will become significantly smaller as the size of the transmitter aperture increases up to around 100 cm. However, the results of recent computer simulations are at odds with this behavior, and we believe that this discrepancy is due to the fact that the conventional Rytov theory does not correctly account for the effects of beam wander on the scintillation index. We present a theoretical structure that accurately describes far-field irradiance fluctuations caused by uncorrected beam wander. This new theory is validated by demonstrating excellent agreement between the predicted scintillation index and computer code results for both tracked and untracked beams. For many applications of practical interest, such as free-space optical communications, a good understanding of the time-average Strehl ratio is also essential simulation results for this parameter are presented and shown to be in good agreement with the theory.

Paper Details

Date Published: 1 July 2006
PDF: 12 pages
Opt. Eng. 45(7) 076001 doi: 10.1117/1.2219470
Published in: Optical Engineering Volume 45, Issue 7
Show Author Affiliations
Larry C. Andrews, Univ. of Central Florida (United States)
Ronald L. Phillips, Univ. of Central Florida (United States)
Richard J. Sasiela, Massachusetts Institute of Technology (United States)
Ronald R. Parenti, Massachusetts Institute of Technology (United States)

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