Communications of the ACM
Researchers Use Light From Leds to Send Data Wirelessly
Credit: Wired.com
Fraunhofer Institute for Telecommunications researchers have experimented with using visible light from commercial light-emitting diodes (LEDs) to transmit data wirelessly at speeds of up to 230 Mbit per secpnd. One advantage to using light to carry data over Wi-Fi or another system is that the lights are already in the room, says Fraunhofer researcher Jelena Vucic.
A signal from an LED is generated by slightly flickering all the lights in unison at a rate millions of times faster than the human eye can detect. Although the bandwidth for commercial LEDs is limited to a few megahertz, Vucic's team increased the amount tenfold by filtering out all the light except for the blue part of the spectrum. The researchers say the data rate could be doubled with some modulation adjustments.
From Computerworld
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