Proposed performance enhancement for terrestrial FSO systems supported by RIS with space-division multiple access under optical noise effects.

Abstract

In the context of sixth-generation (6G) telecommunications networks, free-space optical (FSO) systems are gaining increasing attention due to their high bandwidth, fast transmission speed, and strong security features. However, FSO systems still face significant challenges due to transmission losses and optical noise from the environment. To address this issue, this study proposes enhancing the performance of terrestrial FSO systems by utilizing reconfigurable intelligent surfaces (RIS) in combination with space-division multiple access (SDMA). The proposed model optimizes the spacing between RIS elements to minimize interference, thereby improving the bit error rate (BER) and channel capacity. Performance analysis is conducted through numerical simulations, evaluating the impact of optical noise on the system and proposing optimization solutions. The results demonstrate that integrating RIS with SDMA significantly enhances transmission quality in FSO systems, paving the way for future telecommunications applications.