Beyond Li-Fi for general data, secure optical communication using light is being implemented in environments where RF signals are prohibited or pose a security risk, such as government facilities, financial trading floors, and military installations. Dedicated high-speed data transmission systems use modulated infrared or visible light beams to create isolated, jam-proof network links within a room. These systems can provide a physically secure channel, as the data does not penetrate walls. While niche, this application demonstrates lighting technology’s role in national security and high-stakes communications, where light becomes both an illuminant and a trusted carrier of critical information.
