Scottish company PureVLC is preparing a coup in the field wireless digital communications. Their Li-Fi technology, which uses light to exchange information, can replace traditional data transmission on radio frequencies (Wi-Fi). 
Photos from open sources As stated on the company’s website, their development allows you to network multiple devices without slow performance and provides wireless speed connections up to 130 megabits per second. As a transmitter in this LEDs act on the system that change so quickly light intensity that the human eye does not notice these fluctuations. But the binary signal encoded in flashing is easy recognize special optical sensors mounted on computers or mobile devices. “LEDs represent electronic devices that can be turned on and off very fast, explains company manager Harald Haas (Harald Haas), who is also a professor at Edinburgh University (University of Edinburgh). – Flashing light projects data in the form of “zero” and “units” with a very high speed and sends them to photo detectors. “Note that we are not talking about very quick on / off light, changes in intensity small ones. Haas first demonstrated this technology in 2011 year. Then he transferred the video to a computer using a desktop lamps. At the same time, when he closed the light source with his hand, the video stream stayed. Researchers are now developing special devices that can convert ordinary room Lighting in the Li-Fi network. According to the scientist, the transfer of information via Wi-Fi is inconvenient in that when the source is located radio signal in the next room, connection quality and speed are declining. Also in places like hotels and restaurants where many devices connected to the network, channel bandwidth also falls.
When using Li-Fi, such problems do not arise. Special equipment synchronizes lighting in all rooms to a single oscillation frequency. Moreover, the number of users is practically not limited. The only significant disadvantage of the invention is the fact that the system requires direct visibility between light source and receiver. In the future, developers are planning increase the data transfer rate via Li-Fi to one gigabit per give me a sec. Haas believes that new technology can be used and on a larger scale, for example, for communication with satellites.
