Visible Light Communications

Future wireless communication systems require minimal delay, high-speed data rate and extreme reliability to meet the demands of advanced applications, all while facing constraints on available frequencies. For short range communication, a promising solution meeting these criteria is visible light communications (VLC), which typically utilizes light emitting diodes (LEDs) as transmitters and photodiodes (PDs) as receivers. VLC systems capitalize on the abundant visible light spectrum, operating at frequencies between 400 to 790 THz. Additionally, VLC signals' inherent directionality and lack of penetration make them more secure than traditional radio frequency (RF) systems, thereby enhancing secrecy rates. Beyond fifth generation (5G) or sixth generation (6G) networks aim to capitalize on these advantages by applying the visible spectrum to achieve high physical layer security. VLC systems offer further benefits such as adopting existing infrastructure for low-cost implementation and the dual functionality of illumination and communication, all with minimal power consumption using LEDs.

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