Li-Fi: 10Gbit/s internet speeds achieved with LEDs

In a breakthrough, UK scientists have achieved record data transmission speeds of 10 gigabits per second - more than 250 times faster than 'superfast' broadband - using LED light bulbs. 

The researchers used a micro-LED light bulbto transmit 3.5Gbit/s via each of the three primary colours - red, green, blue - that make up white light. 

The research, known as the ultra-parallel visible light communications project, is a joint venture between the universities of Edinburgh, St Andrews, Strathclyde, Oxford, and Cambridge

The tiny micro-LED bulbs allow streams of light to be beamed in parallel, each multiplying the amount of data that can be transmitted at any one time

Using a digital modulation technique called Orthogonal Frequency Divisional Multiplexing (OFDM), researchers enabled micro-LED light bulbs to handle millions of changes in light intensity per second, effectively behaving like an extremely fast on/off switch.

This allows large chunks of binary data - a series of ones and zeros - to be transmitted at high speed. 

Li-fi promises to be cheaper and more energy-efficient than existing wireless radio systems. 

Another advantage, Haas argues, is that evenly spaced LED transmitters could provide much more localised and consistent internet connectivity throughout buildings.

Earlier this month, Chinese scientists developed a microchipped LED bulb that can produce data speeds of up to 150 megabits per second (Mbps), with one bulb providing internet connectivity for four computers. 

 The project has coined the term " light fidelity" or Li-Fi - also known as visual light communications ( VLC).