Abstract
Sand-dust weather conditions are considered the primary challenge to free-space optical (FSO) communications. It may cause severe attenuation that is malignant to FSO link performance. This study investigates the impact of sand-dust particles on a laser signal using the radiation propagation method and the small-angle approximation method. Numerical simulation shows that in sand-dust weather conditions, the multiple scattering effect is dominant and results in signal pulse delay and pulse broadening. Furthermore, the signal attenuation follows a negative exponential distribution to the laser wavelength. Superior performance can be achieved by employing a longer wavelength laser to reduce pulse delay and mutual interference.
Highlights
Free-space optical communication (FSO) is considered one of the most promising alternatives in metropolitan and local area networks as a viable solution to the access network last mile problem, in which a compromise between the available data rates and the cost is desirable [1, 2]
The performance of an FSO system is dependent on atmospheric conditions, in the presence of aerosols which result in scattering and absorption effects [3,4,5]
Sand-dust particles may cause serious transmission interruption. erefore, we focus on FSO link performance under sand-dust weather conditions to accurately predict the impact of sand-dust particles on FSO transmission
Summary
Free-space optical communication (FSO) is considered one of the most promising alternatives in metropolitan and local area networks as a viable solution to the access network last mile problem, in which a compromise between the available data rates and the cost is desirable [1, 2]. It is insufficient to analyse only the single scattering scenario because the corresponding optical thickness increases with increasing transmission distance and atmospheric visibility. To resolve this issue, Islam proposed a simple model for the calculation of signal attenuation induced by sand-dust particles [9]. Ese researches provide novel perspectives to the problem of laser signal transmission under sand-dust weather conditions. Drawing inspiration from these researches, the radiation propagation method and the small-angle approximation method were utilized in this study to macroscopically analyse the characteristics of laser transmission in a sand-dust channel
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