Design of a Power Amplifying-RIS for Free-Space Optical Communication Systems

The steering dynamics of reconfigurable intelligent surfaces (RISs) have hoisted them to the front row technologies that can be exploited solve skip-zones in wireless communication systems. They enable a programmable environment, turning it into partially deterministic space plays an active role determining how signals propagate. However, RIS-based systems' practical implementation may face challenges such as higher signal attenuation. Furthermore, transmitted double-fading effect over two portions channel. This article tackles this problem near-terrestrial free-space optical (nT-FSO) systems using RIS module based on liquid crystal (LC) silicon (LCoS). A doped LC layer directly amplify light when subjected external field. Leveraging capacity LC, we mitigate double-attenuation faced by signal. We first revisit nT-FSO power loss scenario, then discuss direct-light amplification, and consider system performance. Results show at 51° incoming incidence angle, proposed LCoS design has minimal depth, implying less material. performance results number bits per unit bandwidth is upper-bounded grows with ratio sub-links' distances. Finally, present open issues new research opportunities toward use amplifying-RIS