Free space optical (FSO) communication is one of the recent technologies in a mode of wireless communications. FSO is a data transmission method that requires a line-of-sight between transmitter and receiver from unguided media through an optical carrier in the atmosphere. In the FSO communication system attenuation of information mainly arises because of atmospheric turbulence such as scattering, absorption, scintillation, and fluctuation in the intensity of laser beam, etc. Here in this paper, we are comparing the attenuation coefficient in different atmospheric condition for FSO system. Atmospheric attenuation models are discussed in detail. At the end advantages and application are also highlighted.

FSO