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18 April 2005 Wavelength diversity in free-space optics to alleviate fog effects
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Free-space optical communication systems are adversely affected by weather conditions, especially fog. The objective of this paper is to examine the use of wavelength diversity in free-space optics to mitigate the effect of fog on the received optical signal strength. The source information was encoded and transmitted onto three carrier wavelengths obtained from different parts of the infrared spectrum: 0.85 μm, 1.55 μm, and 10 μm. The transmitted carriers traveled through two different simulated fog conditions, radiation and advection, before being detected and decoded by the receiver. Then, the multiple carriers were combined and processed using two diversity schemes: equal gain and selective diversity. The study was conducted using simulation software PcModWin by onTar Corporation. The results show an average power reception improvement in tens of percent, by comparison to the use of a single carrier. Hence, the increase of the received power translates into a distance improvement of at least fifteen percent.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Eric Wainright, Hazem H. Refai, and James J. Sluss Jr. "Wavelength diversity in free-space optics to alleviate fog effects", Proc. SPIE 5712, Free-Space Laser Communication Technologies XVII, (18 April 2005);

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