Enhancing the atmospheric visibility and fog attenuation using a controlled FSO channel

0426631 - ÚFA 2014 RIV US eng J - Journal Article
Ijaz, M. - Ghassemlooy, Z. - Perez, J. - Brázda, V. - Fišer, Ondřej
Enhancing the atmospheric visibility and fog attenuation using a controlled FSO channel.
IEEE Photonics Technology Letters. Roč. 25, č. 13 (2013), s. 1262-1265. ISSN 1041-1135. E-ISSN 1941-0174
R&D Projects: GA ČR(CZ) GAP102/11/1376
Institutional support: RVO:68378289
Keywords : fog attenuation * Free space optics * visibility
Subject RIV: DG - Athmosphere Sciences, Meteorology
Impact factor: 2.176, year: 2013
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In this letter, two methods for characterizing fog attenuation in terms of atmospheric visibility V in free space optics (FSO) communications are analyzed and compared. Both methods measure the fog attenuation based on V using a charge-coupled device (CCD) camera and a laser-diode at 0.55 mu m. The methods are evaluated in a laboratory controlled FSO atmospheric chamber operating at individual wavelengths of 0.83, 1.31, and 1.55 mu m using a continuous optical spectrum range 0.6-1.6 mu m. The CCD technique shows great accuracy for V < 50 m and the laser technique for the range > 100 m, thus allowing enhancement of the characterization of FSO links in thick and dense fog conditions. The experimental results also show a wavelength dependency for V < 0.5 km where the attenuation decreases from 52 dB/km at visible wavelengths to 46 dB/km at near infrared wavelengths.
Permanent Link: http://hdl.handle.net/11104/0232334