Divergent Gaussian Beams of FSO Links with Power Losses and Pointing Errors.

FSO communications are of great research interest due to their commercially appealing combination of high performance and low-cost operation. However, many degrading effects act on the propagating FSO beam. Among these, this study is limited to the unavoidable influences of three of them, which are the power losses, the Gaussian beam divergence and the pointing errors. Notably, this work elaborates the reversal of the beam divergence action, assuming a focusing lens, which can gather the diverging power to a narrower space. The link’s performance is estimated by novel mathematical expression and the derived results are discussed.