Visible Light Communication
Visible Light Communication (VLC), is an innovative wireless communication technology offering high bandwidth, immunity to interference from electromagnetic sources, and high levels of communications security. In addition, the latest advances in the field of solid state lighting, and the inevitable replacement of florescent lighting by Light Emitting Diodes (LEDs), facilitates the deployment of VLC technology. The combination of bidirectional VLC with LEDs, is referred to as Li-Fi.
VLC addresses the shortcomings of current localized wireless communications. The Radio Frequency (RF) communication suffers from interference, limited bandwidth, and security issues. In addition, RF communication requires a separate setup for transmission and reception of RF waves, at the cost of higher energy consumption. Finally, the limited RF spectrum is unable of meeting the demand for ubiquitous low energy and high capacity connectivity, which is necessary for an efficient implementation of the Internet of Things (IoT / IIoT).
Visible Light Communication (VLC) systems can employ the entire range of the visible light spectrum, in the implementation of visible light enabled communication. The low bandwidth problem of RF communication is resolved in VLC by means of large bandwidth availability (over 10,000 times larger than the bandwidth of RF spectrum).
Because VLC receivers need to reside in the same room as the transmitter, any receivers outside that room will not be able to intercept the signal. This eliminates the inherent security issues of RF communication systems. From a perspective of energy consumption, the visible light source can be used both for illumination and for communication. This makes redundant the extra power required for RF communications, and eliminates the need for additional devices too, like Access Points or Wi-Fi Routers.
VLC is a promising technology featuring non-licensed channels, high bandwidth, and low power consumption.