Visible light communication (VLC/Li-Fi) and optical wireless

Visible Light Communication Fundamentals

Visible Light Communication uses LED lighting infrastructure to transmit data by modulating light intensity at speeds imperceptible to the human eye. The visible light spectrum (380-700 nm, corresponding to 430-790 THz) offers approximately 300 THz of unlicensed bandwidth. Li-Fi, the networked form of VLC standardized under IEEE 802.11bb, achieves multi-Gbps data rates using off-the-shelf LED luminaires and photodetector receivers. VLC provides inherent physical-layer security since light does not penetrate walls, and zero RF interference with existing wireless systems.