October 2008, researchers from the Boston University's College of Engineering evoke the idea of a network of wireless communication using radio waves as WiFi or 3 G but simply light - a luminous walrus of the 21st century in a way not not. Their prototypes peak at 10 Mbps. 2011: the idea made its way and was taken over by the OMEGA European research program. The flows reach almost 1 Gb/s in the laboratory.
The principle of this network is very simple: the data are transmitted in the form of the flashing light-emitting diodes (LED) very high frequency. As on optical fiber, multiplying flows by adding several wavelengths through red, green, blue and white LEDs. In the end, this network has many advantages:
extremely simple installation in a House: just replace the bulbs by LEDinsensibilité interference électromagnétiquesaucune electromagnetic pollution, a point important to electro, aircraft or equipment médicauxfaible énergieun consumption only transmitter can serve several customers, without the necessary bandwidth multiplication (broadcastsécurité since the communication is possible in the cone of illumination of the transmitter)Of course, also can find many drawbacks, the most obvious being the need to maintain direct visibility of the receptor by the issuer and to maintain the lit lamp. These two conditions are met however in many environments such as offices in open space, restaurants, etc.
Researchers at the Fraunhofer Heinrich Hertz Institute (HHI) manage to maintain a flow of 125 Mb/s with components at low cost and simple encoding on / off. With LEDs most efficient avalanche and a WDM modulation, they reach 800 Mb/s. This network will be showcased at the next IFA in Berlin in September.
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