Successful data transmission through LED beams

Regular LEDs can be turned into optical WLAN with only a few additional components thanks to visible light communication (in short, VLC). The lights are then not just lighting up, they also transfer data. They send films in HD quality to your iPhone or laptop, with no loss in quality, quickly and safely.

Just imagine the following scenario: four people are comfortably ensconced in a room. Each one of them can watch a film from the internet on his or her laptop, in HD quality. This is made possible thanks to optical WLAN. Light from the LEDs in the overhead lights serves as the transfer medium.

For a long time, this was just a vision for the future. However, since scientists from the Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute HHI in Berlin, Germany, have developed a new transfer technology for video data within the scope of the OMEGA project of the EU, its implementation in real life is getting markedly closer.

At the end of May, the scientists were able to present the results of the project in Rennes, France. They were able to transfer data at a rate of 100 megabits per second (Mbit/s) without any losses, using LEDs in the ceiling that light up more than ten square meters (90 square feet).

The receiver can be placed anywhere within this radius, which is currently the maximum range. ''This means that we transferred four videos in HD quality to four different laptops at the same time,'' says Dr. Anagnostis Paraskevopoulos from the HHI.

''The fundamentals of visible light communication (VLC) were developed together with the industry partners Siemens and France Telecom Orange Labs,'' said the expert. At HHI, the team of project manager Klaus-Dieter Langer is now further developing the new technology. ''For VLC the sources of light – in this case, white-light LEDs – provide lighting for the room at the same time they transfer information.