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

Ijaz, Muhammad, Ghassemlooy, Zabih, Perez Soler, Joaquin, Brazda, Vladimir and Fiser, Ondrej (2013) Enhancing the atmospheric visibility and fog attenuation using a controlled FSO channel. IEEE Photonics Technology Letters, 25 (13). pp. 1262-1265. ISSN 1041-1135

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Abstract

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 μm. The methods are evaluated in a laboratory controlled FSO atmospheric chamber operating at individual wavelengths of 0.83, 1.31, and 1.55 μm using a continuous optical spectrum range 0.6-1.6 μm. 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.

Item Type:	Article
Uncontrolled Keywords:	Free space optics, fog attenuation, visibility
Subjects:	H600 Electronic and Electrical Engineering
Department:	Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User:	Becky Skoyles
Date Deposited:	14 Oct 2013 09:31
Last Modified:	13 Oct 2019 00:32
URI:	http://nrl.northumbria.ac.uk/id/eprint/13696

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