Analysis of Rain Effects on Free Space Optics （分析降雨对自由空间光学的影响）.pdf

International Journal of Information and Electronics Engineering, Vol. 4, No. 6, November 2014 Analysis of Rain Effects on Free Space Optics Based on Data Measured in the Libyan Climate Mohamed O. Twati, Mahmud M. Badi, Adam F. Adam  by the Beer Lambert Law [3]: Abstract—In this paper, the effect of rain on Free Space Optical link (FSO) performance based on data measured and P ,L recorded in the Libyan National Meteorological Center T , L   exp () L (1)     (LNMC) is investigated. A modified FSO link equation based P ,0   on CARBONNEAU empirical model is used to provide a direct relation between the rain fall rate and the maximum allowable where: FSO link length. The effect of the heaviest case of rainfall occurred in Libya for the FSO is simulated, and the maximum Τ (λ, L) is the total transmittance of the atmosphere at allowable link length is obtained. wavelength λ. P (λ, L) is the signal power at distance, L from the Index Terms—Free space optics, optical link measurements, transmitter. optical link