If the hype is to believed, Li-Fi could be the next Wi-Fi. And if that’s the case, then we’re excited—because a team of researchers has just smashed the record for visible light data transmission, pushing it to a staggering 10Gbit/s.
https://gizmodo.com/chinese-scientists-invent-lightbulbs-that-emit-wi-fi-1447764194
A team of researchers from the universities of Edinburgh, St Andrews, Strathclyde, Oxford, and Cambridge, all in the UK, have used a micro-LED light bulb to transmit 3.5Gbit/s across each of the three primary colours, red, green, and blue. Add that up, and it means that they can transfer 10Gbit/s across the three channels.
The LED bulbs, developed at the University of Strathclyde, allow streams of light to be beamed in parallel, reports the BBC. Each beam carries a seperate data stream, each one encoded using digital modulation—Orthogonal Frequency Divisional Multiplexing for the true nerds—to produce millions of changes in light intensity per second. It’s like hitting the on-off switch very, very fast to transfer binary data.
And, clearly, it works. In fact it beats the 150 mbps boasted by the recent Chinese Li-Fi initiative, and even the record of 1Gbit/s previously held by Germany’s Fraunhofer Heinrich Hertz Institute . Of course, how useful Li-Fi will ever be is up for debate: it’s fast and cheap, sure, but walls are not its friend. Still, it’s super cool that the technology is developing at such a rapid pace. [BBC]
Image credit: Shutterstock/Peshkova
