Li-Fi is the term used to label the wireless communications systems fast and inexpensive, the optical equivalent to Wi-Fi.1 The word Li-fi was indexed by Harald Haas in a lecture at TED on light communication visible.2
The technology was shown at the Consumer Electronics Show in 2012 using a pair of smartphones Casio to exchange data by varying the intensity of light from their screens, operating at peak separation ten metros.3
In October 2011, an association of industries and groups of companies formed the Li-Fi Consortium to promote wireless high-speed optical systems and overcome the limitations of the radio spectrum by exploiting a completely different part of the electromagnetic spectrum. The consortium expects him to reach speeds of more than 10 Gbps, theoretically enabling a high definition movie to be downloaded in 30 sec.
Li-Fi has the advantage of not causing interference with other systems and can be used in sensitive areas like the inside of an airplane. However, the light waves can not penetrate used paredes.5
