A new wireless internet access technology called li-fi has been announced, which transmits data through light via standard LED bulbs.
method of wireless transmission doesn't suffer from the interference of
traditional wi-fi and offers speeds 100 times faster, up to 1Gbps
(gigabit per second) which is 1000 Mbps (megabits per second). However,
lab tests have shown theoretical speeds of up to 224Gbps.
technology was tested this week by Estonian company Velmenni, in an
office environment, allowing workers to access the internet.
technology works by using a controller to vary the current to an LED
bulb (or bulbs) at very high speed, varying the intensity of the light
output enough to be detected by a photodetector device connected to a
computer, but not enough to be noticed by the human eye.
lightbulb could be controlled in this way to offer the very high speed
internet connection, but there are some downsides. The technology
doesn't work outside in daylight for example, because of the presence of
the sun. Plus of course, you need to have the lights on for li-fi to
The fact that li-fi doesn't cause or suffer from the radio
interference of traditional wi-fi is a big plus though, allowing it to
be used on aircraft, in hospitals and other such sensitive environments.
Velmenni chief executive Deepak Solanki has stated that the technology could reach consumers within three to four years.
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