Abstract :Factors such as the increasing number of users in communication systems and the expectation of high data rates in recent years, along with technological developments, have increased the interest in different protocols. In this context, optical communication systems that promise high data rate, wide frequency spectrum and secure communication attract great attention. Free space optical communication networks (FSO), one of the types of optical communication systems, aim to provide communication by using the propagation of signals modulated at optical frequencies in the free space channel. In this study, the performance of Raman, Erbium-Doped Fiber Amplifier (EDFA), Ytterbium- Doped Fiber Amplifier (YDFA) amplifiers in FSO systems was carried out with the help of OptiSystem 9.0 simulation program and the most efficient amplifier type that can be used in FSO systems was determined. Keywords : Free Space Optical Communication, Optical Amplifiers
