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
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.
- 1 Autistic teenager beaten up by bullies makes them watch 20-minute video about autism
- 2 Greece debt crisis explained: A history of just how the country landed itself in such a mess
- 3 People all over the world are getting semicolon tattoos to draw attention to mental health
- 4 Greek debt crisis: Yanis Varoufakis's funniest (and most memorable) quotes
- 5 The biggest first date turnoff has been revealed
Greece debt crisis explained: A history of just how the country landed itself in such a mess
Swedish minister gives strongest case yet on why EU should stop turning away asylum seekers
Man dies instantly after shooting firework from top of his head
Isis schoolgirl Amira Abase who fled London to join terrorists in Syria mocks victims of Tunisia massacre
Father faces deportation to Thailand after 27 years in Britain for two 'stupid crimes'
More Britons believe that multiculturalism makes the country worse - not better, says poll
Osborne to cap family benefits at £23,000 – announced ahead of his post-election Budget
Nathan Collier: Montana man inspired by same-sex marriage ruling requests right to wed two wives
Greece crisis: IMF was pushed around by Angela Merkel and Nicholas Sarkozy – and now it is being humiliated
Forget little green men – aliens will look like humans, says Cambridge University evolution expert
Girl, 7, stares down hate preacher at Ohio festival with pro-LGBT rainbow flag gesture
£20000 - £40000 per annum: Recruitment Genius: Trainee Vehicle Inspectors / Pu...
£18000 - £45000 per annum: Recruitment Genius: This is an exciting opportunity...
£18000 - £45000 per annum: Recruitment Genius: A Sales Executive is required t...
£25000 - £50000 per annum: Recruitment Genius: This innovative online car purc...