Wi-Fi-network data transfer can be replaced by light


10/10/2012

Scottish company PureVLC decided to make a real revolution by developing a new method of wireless digital communications. The company’s technology Li-Fi, which uses light to exchange information, may eventually replace today widespread transmission of data via radio frequencies (Wi-Fi).

According to the website of the company, the new design allows you to combine a number of network devices, without compromising performance, and providing speed almost equal to 130 megabits per second of any wireless connection.

The LEDs in the system act as a transmitter. They are so quickly changing the intensity of light that the human eye does not notice these fluctuations. A binary signal that is encoded in a wink, easily recognized by special optical sensors installed on computers, mobile devices.

"LEDs - electronic devices that can be quickly turned on and off - explains Harald Haas (Harald Haas), Head and Professor of the University of Edinburgh (University of Edinburgh). - Continuously flashlight projecting a high speed data as a "zero" and "one", and then transmits them to the photodetectors. "

It should be noted that we are not talking about a very fast turn-off of light intensity change of focus.

For the first time this technology has demonstrated Haas in 2011, transferring video to a computer using a desk lamp. When he hand, closed the light source, the video immediately stopped.

Currently, researchers are working on a special device that can transform an ordinary room lighting in Li-Fi network.

Scientists suggest that the transmission of information via Wi-Fi uncomfortable in the first place so that the quality of the connection and the speed at the location of the source signal in an adjacent room, are reduced. In addition, in places such as hotels and restaurants, where a lot of devices connected to the network, the channel capacity is also reduced.

The use of Li-Fi allows you to avoid such problems. Special equipment in all areas of lighting syncs to a single oscillation frequency. But when the number of users is not limited at all.

The only disadvantage of the new invention is a condition for the operation of the system between the light source and the receiver immediately after the direct visibility.

In the future, the developers intend to increase the data transfer rate of up to one gigabit per second by Li-Fi. Haas believes that the new technology may well be applicable on a larger scale, to communicate with satellites, for example.


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