Light emitting diodes known as LED, are gradually invading our daily lives. We found them in our TV screens or lamps because we can save lots of energy. But did you know that it is possible to be connected to an Internet network through the same LED? Indeed it has become a reality thanks to researchers at the Chinese Academy of Sciences who come to this major discovery.
How a laptop placed under a light can access to the Internet that is the question that journalists have wondered, seeing the prototype presented by the Institute of semiconductors in the Shanghai World Expo. Professor Duan Jinyuan then points his finger at the LED toward the ceiling and explained that data is sent by the light emitted by the LED and the current maximum speed is 2 megabits per second. Furthermore, it indicates that they have managed to turn these LED to switch and remote control for home appliances.
How does it work? The experts explained that the light emitted by a LED is different from traditional lighting. In addition to being particularly economical and powerful, they generate signal modulation when you turn on or off the light of the LED. Thanks to this property they have succeeded in transmitting information. Also the speed of turning on and off the LED is so fast (2,000,000 times per second) that the human eye does not realize anything.
What are the benefits of this technology and its limits? The main drawback of wireless technologies used today are the electromagnetic waves generated that can be dangerous for human body and they create interference with electronic equipment located nearby. But with the LED transmission there are no radio waves. But the only disadvantage might be the physical barriers that the light might encounter in its path, like a wall or water for example. But researchers have solved the problem by creating LED relays which receive and retransmit LEDs signal without losses.
The expert said that the LED technology has a huge potential in the data transmission because it doesn’t emit dangerous waves in the environment. Researchers are now working on the data throughout rate and expects to achieve in the near future several Gigabits per second. Signs of future potential of this technology, countries like the U.S. or Japan have begun to work on the wireless transmission of data through LEDs.