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LED Light Bulb Based 'Li-Fi' Closer, Say Chinese Scientists

dryriver (1010635) writes | about 10 months ago

0

dryriver (1010635) writes "The BBC reports: Wi-fi connectivity from a light bulb — or 'li-fi' — has come a step closer, according to Chinese scientists. A microchipped bulb can produce data speeds of up to 150 megabits per second (Mbps), Chi Nan, IT professor at Shanghai's Fudan University told Xinhua News. A one-watt LED light bulb would be enough to provide net connectivity to four computers, researchers say. But experts told the BBC more evidence was needed to back up the claims. There are no supporting video or photos showing the technology in action. Li-fi, also known as visible light communications (VLC), at these speeds would be faster — and cheaper — than the average Chinese broadband connection. In 2011, Prof Harald Haas, an expert in optical wireless communications at the University of Edinburgh, demonstrated how an LED bulb equipped with signal processing technology could stream a high-definition video to a computer. He coined the term 'light fidelity' or li-fi and set up a private company, PureVLC, to exploit the technology. 'We're just as surprised as everyone else by this announcement,' PureVLC spokesman Nikola Serafimovski told the BBC. 'But how valid this is we don't know without seeing more evidence. We remain sceptical.' This year, the Fraunhofer Heinrich Hertz Institute claimed that data rates of up to 1Gbit/s per LED light frequency were possible in laboratory conditions, making one bulb with three colours potentially capable of transmitting data at up to 3Gbit/s."
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