Free Space Optics Availability and Reliability

communication form. The basic FSO link is made of two FSO heads which communicate through a laser beam on a specific wavelength. FSO link requires a direct visibility between its nodes. It is a very efficient form for data transmission for short distance communication links. This paper describes basic FSO features with consideration on negative weather factors which have the negative influence on signal transmission. The unique fog sensor will be presented in this paper. This device gathers some specific data about weather conditions. Measured data is processed mathematically and results can be used in further FSO link evaluation as well as in process of switching FSO link with some form of back up radio link. Keywords—fog sensor; FSO; availability; web application; fog; reliability I