Communication is an important part of our daily life. The communication process involves information generation, transmission, reception, and interpretation. The transmission using high bandwidth can handle vast amounts of information, which can be further improved by reduction in fibre losses, increase in data rates and distances, development of optical sources and detectors compatible with fibres. Today’s demand is a communication link with maximum performance and minimum errors. Free Space Optics is a medium with high bandwidth having maximum data rates and security issues favoring its promotion for the present era. Wide bandwidth signal transmission with low delay is a key requirement in present day applications. Optical fibers provide enormous and unsurpassed transmission bandwidth with negligible latency and are now the transmission medium of choice for long distance and high data rate transmission in telecommunication networks. After studying a lot of research paper some analysis is carried out. We have to see an impact of various conditions like atmospheric turbulence, path loss factor, distance, and BER. BER is one of the most important parameters which should be minimum otherwise distorted information will be received at the receiver side and BER increases with distance and other atmospheric turbulence.