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Haze and rain are the most important impairment factors at the tropical region that affect the performance of free space optical (FSO) links; they limit the visibility which directly reduces the link availability. Lower visibility generates high attenuation of optical signal resulting in reducing the link availability of the optical signal. In this project, availability performance is evaluated by establishing a one-year measured visibility data in Malaysia. Based on one measurement of visibility, link availability of 99.99% can be achieved over a link distance of 1 Km for 37.44 dB SNR. [ABSTRACT FROM AUTHOR]