Review of WDM based Free Space Optics Communication System

Free space optic communication provide high speed, large bandwidth, low power, smaller size and efficient communication. FSO is license free and widely used for long range of distance operating under different atmospheric conditions. One of the critical problems facing with long range FSO communication is atmospheric turbulence which result degradation in signal. Free space optics (FSO) technology has various advantages over different communication systems such as higher data rates/speed, bandwidth and capacity despite of these advantages, it has attenuation problem which can degrade the system performance. By using Wavelength Division Multiplexing (WDM) over FSO link, the system capacity can be increased. This literature survey deal with the FSO communication system, features of FSO system and atmospheric turbulence on WDM-FSO communication link in the existing method.