Analysis of Free Space Optical Communication System for Different Atmospheric Conditions & Modulation Techniques

The free space optical communication (FSO) is often used for digital communication systems because of its low cost. It is also preferred where the developing the infrastructure is difficult. It also provides the security because of its line of sight nature and very small detectable area, but besides the given advantages it’s having serious problem because the performance of FSO is very sensitive to the channel (space) conditions, which changes continuously also the conditions are much complicated then the conditions in RF channels. Hence in this paper an analysis of the FSO communication in presented under scattering, fading & fog conditions with DPSK modulation.