Estimating the performance of Free Space Optics and its benefits

For large bandwidths and secure data transfer applications, FSO communication has gotten a lot of interest from academics. However, the local atmospheric conditions restrict its performance. The focus of this work is on an FSO system that uses a diversity strategy to compensate for signal loss caused by moderate to heavy air turbulence. Over the gamma-gamma distribution channel, we obtain a closed-form equation for two crucial parameters: average BER and outage probability. In this study, numerical results for several combining strategies are provided. With wavelength diversity, the reliability and performance of the FSO communication system are improved.