Li-Fi revolution: internet connections using light bulbs are 250 times faster than broadband
The next generation of wireless internet could use converted LED lightbulbs to transmit data faster and more cheaply than traditional Wi-Fi signals
Monday 28 October 2013
Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s – more than 250 times faster than ‘superfast’ broadband.
The fastest speed previously reported was 3Gbit/s, achieved earlier this year by the Fraunhofer Heinrich Hertz Institute in Germany. Chinese researchers also claimed this month to have produced a 150Mbp/s connection, but some experts were doubtful without seeing further proof.
The term Li-Fi was coined by Edinburgh University's Prof Harald Haas during a TED talk in 2011 (see below for video) though the technology is also known as visible light communications (VLC).
Many experts claim that Li-Fi represents the future of mobile internet thanks to its reduced costs and greater efficiency compared to traditional Wi-Fi.
Both Wi-Fi and Li-Fi transmit data over the electromagnetic spectrum, but whereas Wi-Fi utilises radio waves, Li-Fi uses visible light. This is a distinct advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data density.
Li-Fi signals work by switching bulbs on and off incredibly quickly – too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to stream several lines of data in parallel.
The research was carried out by the Ultra Parallel Visible Light Communications project, a joint venture between the universities of Oxford, Cambridge, Edinburgh, St Andrews and Strathclyde, and funded by the Engineering and Physical Sciences Research Council.
Existing LED light bulbs could be converted to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of interfering with electronic circuitry.
And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be dimmed to the point that they were not visible to humans and yet still functional. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not penetrate solid materials.
The makers of Li-Fi note that this quality might actually be an advantage in some scenarios, making Li-Fi more secure than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.
Board creates magnetic field to achieve lift
Singer says the track was 'force-fed down people's throats'
Endangered species spotted in a creek in the Qinling mountains
Trend which requires crisps, a fork and a strong stomach is sweeping Mexico's streets
George Lucas criticises the major Hollywood film studios
Film follows park rangers in the Congo
Does Chris Grayling realise what a vague concept he is dealing with?
- 1 Jack the Ripper: Scientist who claims to have identified notorious killer has 'made serious DNA error'
- 2 Banksy arrest hoax: Internet duped by fake report claiming street artist's identity has been revealed
- 3 Drink alcohol and eat meat to improve male fertility - but cut down on coffee, studies suggest
- 4 Former East 17 frontman Brian Harvey turns up at Downing Street and 'demands to speak to Prime Minister'
- 5 The inventor of the Facebook 'like' button says he never made a 'dislike' button because he feared the 'unfortunate consequences'
Ukraine crisis: Donetsk 'tactical missile' explosion at factory sends blast wave across rebel-held city
Jack the Ripper: Scientist who claims to have identified notorious killer has 'made serious DNA error'
Banksy arrest hoax: Internet duped by fake report claiming street artist's identity has been revealed
Super-sized ships arrive in Britain: How big can they get?
Former East 17 frontman Brian Harvey turns up at Downing Street and 'demands to speak to Prime Minister'
Cameron is warned 'no possibility' of UK reducing immigration and that bid to bring in quota on migrant workers would be illegal
Residents should throw a street party and mix with immigrant neighbours, councils told
Russell Brand threatened with arrest after filming outside Fox News headquarters
Amal Alamuddin calls for the return of the Elgin Marbles from Britain: 'Injustice has persisted for too long'
London bus driver 'kicks gay couple off for kissing'
Lord Freud: Tory welfare minister apologises after saying disabled people are 'not worth’ the minimum wage
Negotiable: Randstad Education Leicester: We are recruiting for a Systems and ...
£120 - £140 per day: Randstad Education Group: English as an Additional Langua...
£10000 - £15000 per annum: Randstad Education Cambridge: Nursery assistants re...
£60 - £65 per day: Randstad Education Liverpool: Job opportunities for Seconda...