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Proceedings Paper

Experimental comparison of coherent array detection and conventional coherent detection for laser radar and communications
Author(s): Jing Xu; Arnaud Delaval; R. Glenn Sellar; Ammar Al-Habash; Pete Reardon; Ronald L. Phillips; Larry C. Andrews
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Paper Abstract

There is an upper bound on the effective size of receiving aperture for both the improvement in carrier-to-noise ratio and the reduction in signal fading of a conventional coherent detection system due to the atmospheric turbulence-induced finite transverse coherence length of the received laser field for laser radar and communications. But a coherent array detection system, which uses multiple independent apertures/receivers whose IF's are electro-optically co-phased in real time and then added, can overcome the effective aperture limitation and mitigate the signal fading. This paper presents experimental comparison of the performance of an eight-aperture coherent array detection system and the conventional coherent detection system. The field tests were conducted over two-km range (round-trip). The carrier-to-noise ratio and the fade statistics of the IF signals were investigated for both systems. The results show a gain factor of up to six on the mean carrier-to-noise ratio of the IF signal from the eight-aperture coherent array detection system compared to the conventional coherent detection system even though the two systems collected the same power of laser signal. Also shown is a factor of 100,000 reduction in probability of fade of the IF signal.

Paper Details

Date Published: 26 April 1999
PDF: 10 pages
Proc. SPIE 3615, Free-Space Laser Communication Technologies XI, (26 April 1999); doi: 10.1117/12.346203
Show Author Affiliations
Jing Xu, CREOL/Univ. of Central Florida (United States)
Arnaud Delaval, Thomson-CSF (France)
R. Glenn Sellar, CREOL/Univ. of Central Florida (United States)
Ammar Al-Habash, CREOL/Univ. of Central Florida (United States)
Pete Reardon, CREOL/Univ. of Central Florida (United States)
Ronald L. Phillips, CREOL/Univ. of Central Florida (United States)
Larry C. Andrews, CREOL/Univ. of Central Florida (United States)


Published in SPIE Proceedings Vol. 3615:
Free-Space Laser Communication Technologies XI
G. Stephen Mecherle, Editor(s)

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