Impact of Gamma-Ray Dose on Indoor Visible Light Communication Link Performance: A Geant4 Study

This research presents an extended performance analysis of an indoor Visible Light Communication (VLC) system by integrating experimental results with advanced GEANT4 simulations. Building on a prior empirical study that evaluated different LED configurations and photodetectors, this work explores critical environmental and spatial parameters that influence VLC efficiency and reliability. Parameters such as wall reflectivity, emission angles, photon energy, and photon travel time are systematically analyzed using a validated GEANT4 simulation framework. The results confirm the strong impact of narrow emission angles and high wall reflectivity on detection performance, while also highlighting the importance of time delay modeling in high-fidelity simulations. Energy deposition was realistically correlated with photon count and energy levels, offering valuable insight into detector response and system thermal behavior. This study demonstrates the robustness of combining experimental insights with physics-based simulation, thereby offering a comprehensive and realistic perspective for designing optimized VLC systems in complex indoor environments.