Data transfer using light can replace the Wi-Fi-network


Scottish company PureVLC preparing a revolution in the field of wireless digital communications. Their technology Li-Fi, which utilizes light for the exchange of information may replace the conventional data transmission radio frequency (Wi-Fi).

As stated on the company's website, their design allows you to combine multiple devices to the network without sacrificing performance and provides wireless speeds of up to 130 megabits per second.

As a transmitter in this system are the LEDs that are so rapidly changing intensity of light that the human eye does not notice these fluctuations. But encoded binary signal blinking easily recognize the special optical sensors installed on computers or mobile devices.

"LEDs are electronic devices that can be switched on and off very quickly — explains the head of Harald Haas (Harald Haas), who is also a professor at the University of Edinburgh (University of Edinburgh). — Flashing Light project data in the form of" zero "and" unit "a very high speed, and transmits them to the photodetectors."

Note that we are not talking about a very fast turn-off of light intensity changes are small.
Haas first demonstrated the technology in 2011. Then he gave the video to your computer using a table lamp. At the same time, when he closed his hand a light source, the video stopped.

Now researchers are developing a special device, which can transform an ordinary room lighting in Li-Fi network.
According to the scientist, the transmission of information via Wi-Fi is inconvenient fact that the location of the source of the radio signal in the next room, the quality of the connection and the speed reduced. Moreover, in places such as hotels and restaurants, where many devices connected to the network, the channel capacity is also falling.



When using the Li-Fi are no such problems. Special equipment synchronizes lighting in all rooms at a single frequency of oscillation. The number of users is practically unlimited.

The only significant disadvantage of the invention is that the system requires a direct line of sight between the light source and the receiver.
In the future, the developers plan to increase the data rate of Li-Fi up to one gigabit per second. Haas believes that new technology can also be used on a larger scale, for example, to communicate with the satellites.

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