Optical communication record: LED lamps can transmit digital information at a rate of 800 Mbit/s

Through simple modulation of LED lighting in the LED device, it can be used as an optical wireless local area network (WLAN) digital transmitter. Researchers at the Fraunhof Institute of telecommunications, the Research Institute of the Hertz Institute (HHI), SIEMENS, and, France Telecom, are working to turn the concept into practical use in Orange. This technology will allow simultaneous transmission of multiple video signals to a computer and cell phone equipped with a photodiode.

Scientists at the end of May this year on the realization of the data transmission speed of 100 Mbit / s, and no loss of information, the experimental object is LED ceiling lights illuminate the area more than 10 square meters. The receiver can be placed anywhere in this area. Heinrich Hertz Institute Anagnostis Paraskevopoulos said: this means that we have four HD video simultaneously transmitted to the four different laptops. "

Scientists are studying higher bit rates. Claus - ·, Lange said, "using red blue green white LED, we are able to achieve a 800 Mbit / s rate in the laboratory at. This is a world record for visible light communication (VLC) methods. "

This technology can be used in places where radio transmission is not permitted. For example, the use of optical communication in the operation room, can achieve high-speed data transmission integrity, will be possible to control surgical robot, or wireless transmission of X optical image; moreover, this technique is used in the plane, passengers can watch their entertainment programs on the display, thereby saving the number of miles of cable; in addition, this technique can also be used for the production of equipment for industrial production, avoid radio transmission interference.

Scientists stressed that VLC is not to replace the commonly used WLAN, PowerLAN, or UMTS. It is best suited to be used as a data transmission option for use in a radio transmission network that is not intended or impossible, and does not require a new cable or device. Combinations are also possible, such as the use of optical WLAN in the transmission channel, and the use of PowerLAN in the return channel.