  Free space optics (FSO) is a field of curiosity and importance for the
scientists because of its numerous applications and advantages like low cost
FSO systems, easy deployment, high data rate, secure FSO links and license free
bands. Very high bandwidth FSO link can be effectively established between the
skyscrapers of the Islamabad Pakistan for the purpose high capacity
applications in these skyscrapers. FSO links are badly affected by the weather
conditions especially rain and fog because of high attenuation factors.
optisystem is used to study the effect of rain and fog on the performance of
FSO links.
