Light Fidelity (Li-Fi) is a new ground-breaking
technology which provides ubiquitous wireless
access, connecting people and devices in residential,
business, factory, and other settings with highly
secure, cost-effective communications. Depending
on the type of deployment and application, a
benefit of LiFi is the capability of LED light bulbs to
provide both illumination and network connectivity
simultaneously and seamlessly.
LiFi is a form of Visible Light Communications (or 'Visual' Light Communications), and part of the broader field of Optical Wireless Communications (OWC). LiFi uses light emitting diodes (LEDs) to deliver networked, mobile-capable, high-speed communication. Primary implementations of LiFi utilize stand-alone transceivers or LED light bulbs, controlled by a driver that turns the LED on and off, to transmit encoded data. An optical sensor is used to receive the data, which is then decoded. The transmissions occur at rates of many millions of times per second, which is not perceivable by the human eye.
LiFi, like WiFi, enables devices such as computers, smartphones, and printers, televisions, speakers, headphones, and a vast number of devices under the Internet of Things (IOT) umbrella, to communicate bi-directionally without the use of radio frequency waves and without interference.
Visible Light Communications (VLC) and "LiFi"
products utilize light spectrum to transmit data,
similar to how WiFi transmits data with radio and
microwave frequency spectrum. Light spectrum
is up to 10,000 times more plentiful than radio
frequencies and does not compete or interfere with
WiFi or other RF networks. VLC products include
point to point, and point to multi-point applications.
VLC uses visible light between 400 THz (780 nm) and 800 THz (375 nm). VLC uses lights (ordinary lights/lamps) or LEDs to transmit data. Since light from these sources is not detrimental to the human eye/vision, and is immune to radio frequency interference and congestion, VLC technology is emerging as a new, innovative way of transmitting data.