16 June 2004 Aperture averaging: theory and measurements
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Proceedings Volume 5338, Free-Space Laser Communication Technologies XVI; (2004); doi: 10.1117/12.528901
Event: Lasers and Applications in Science and Engineering, 2004, San Jose, Ca, United States
Abstract
Atmospheric laser communications using direct-detection systems do suffer from severe degradation caused by scintillation. Because the atmospheric cut-off frequency can be as low as 100 Hz, temporal averaging is not applicable in high-speed communications. The simplest way of reducing fading is to increase the receiver size and to take advantage of aperture averaging. Spatial and temporal variations of the received intensity have to be investigated in order to predict the efficiency of aperture averaging. This paper reviews briefly the theory of spatial averaging that characterizes the direct-detected optical power. For comparison purposes, results of measurements are presented. These measurements consist of recorded pupil intensity patterns for a scenario with known turbulence profile. Statistics derived from measurement data are compared with theoretical second-order statistics.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Nicolas Perlot, Daniel Fritzsche, "Aperture averaging: theory and measurements", Proc. SPIE 5338, Free-Space Laser Communication Technologies XVI, (16 June 2004); doi: 10.1117/12.528901; https://doi.org/10.1117/12.528901
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KEYWORDS
Scintillation

Receivers

Turbulence

Charge-coupled devices

CCD cameras

Error analysis

Distortion

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