In this paper, we investigate the adverse atmospheric effects, including wind disturbance, dry fog, wet fog, and smoke conditions, which are simulated on an atmospheric testbed specifically built for free-space optical communication (FSOC) experiments. We have also developed an FSOC system that can modulate the optical signals with the choice of the modulation, encoding scheme, and encryption. A robust, secure link that is operated by the user from a single graphical user interface. We have furt