EUのプロジェクトで白色 LED可視光を利用して 100Mbpsのデータ転送に
"Data are traveling by light"
Research News August 2011
Fraunhofer Institute for Digital Media Technology IDMT
"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."
"... 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.
"In the future data will be transferred to laptops with the help of LEDs"
""For VLC the sources of light - in this case, white-light LEDs -
provide lighting for the room at the same time they transfer
information. With the aid of a special component, the modulator,
we turn the LEDs off and on in very rapid succession and transfer
the information as ones and zeros. The modulation of the light is
imperceptible to the human eye. A simple photo diode on the laptop
acts as a receiver.""
Klaus-Dieter Langer, the team of project manager, HHI
"The new transmission technology is suitable for hospitals,
for example, because radio transmissions are not allowed there."
"Currently the scientists are developing their systems toward
higher bit rates. "Using red-blue-green-white light LEDs, we were
able to transmit 800 Mbit/s in the lab," said Klaus-Dieter Langer."