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Proceedings Paper

Receiver performance characterization for modulating retro-reflector atmospheric optical links with pulsed lasers and optical pre-amplifiers
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Paper Abstract

Receiver performance is calculated for two types of free-space atmospheric optical communications systems − a direct detection system using a p-i-n photodiode preceded by an optical amplifier, and an ideal coherent receiver operated in its shot-noise limited regime without an optical pre-amplifier. The signal format for both is amplitude shift keying (on-off modulation) with an assumed rectangular light pulse of duration T seconds. The more accurate Beckman probability density function (pdf) is used to describe the intensity fading rather than the more commonly used log-normal pdf which overestimates receiver performance. A coherent receiver using asynchronous detection is shown to outperform the direct detection system with an optical pre-amplifier gain of 30 dB by anywhere from 7 to about 10 dB depending on Rytov variance intensity fading levels. In addition, the effect of inner scale turbulence parameter, l0, on system bit error rate is demonstrated.

Paper Details

Date Published: 31 August 2005
PDF: 11 pages
Proc. SPIE 5892, Free-Space Laser Communications V, 58920F (31 August 2005); doi: 10.1117/12.618345
Show Author Affiliations
F. M. Davidson, Johns Hopkins Univ. (United States)
P. Nigon, Johns Hopkins Univ. (United States)
G. C. Gilbreath, Naval Research Lab. (United States)
W. S. Rabinovich, Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 5892:
Free-Space Laser Communications V
David G. Voelz; Jennifer C. Ricklin, Editor(s)

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