Li-fi protocol allows use of the internet at the speed of light

Jul 16, 2014

Sisoft Company in Mexico has developed a technology that can illuminate a large work space, an auditorium or an office, while providing full mobile internet to every device that comes into the range of the light spectrum.

The Mexican group managed to transmit audio, video and Internet across the spectrum of emitted by LED lamps. This new technology, called Li-Fi or light fidelity, is presented as an alternative to Wi-Fi because it will maximize the original provided of the internet to offer safer data transfer and a of up to 10 gigabytes per second.

The Li-Fi device circulates data via LEDs that emit an intermittent flicker at a speed imperceptible to the human eye. "As Wi-Fi uses cables to spread our connections, wireless transmission Li-Fi uses LED lamps that emit high brightness light", said Arturo Campos Fentanes, CEO of Sisoft in Mexico.

Another advantage in comparison to Wi-Fi is that there is no way to hack the signal since the internet is transmitted by light, there is no way to "steal it". Furthermore, it can be installed in hospitals areas that use radiation apparatus and generally block or distort internet signal, Campos Fentanes said.

With this expansion through the market is seeked, with lower costs and a service increased by five thousand percent . Currently in Mexico the highest transfer rate is 200 megabytes per second. Just to get an idea, with Li-Fi you could quickly download an entire HD movie in just 45 seconds.

Also known as visible light communications (VLC), this technology began with an internet speed of two Gigabits per second, but Sisoft along with researchers from the Autonomous Technological Institute of Mexico (ITAM) adapted the system to be multiplied five times.

Campos Fentanes explained that the first experiments were conducted with audio, in which a cable is connected via 3.5 mm audio Jack from a smartphone to a protoboard table to transform the auditory signal in optical waves. That way a special emitter transmits data across the spectrum of light generated by an LED lamp and is captured by a receptor located in a speaker that reproduces sound.

For wireless internet transmission, the mechanics is similar. The station developed by Sisoft of Mexico stands above the router device that distributes the internet signal and a lamp-LED is incorporated to maximize the speed of data transfer. Light will emulate an antenna, but only the electronic apparatus that has the receptor for the "optical audio" signal and is inside the range of the halo of light will have a connection.

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User comments : 15

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jackjump
3.7 / 5 (3) Jul 16, 2014
How do you send data?
Whydening Gyre
1 / 5 (1) Jul 16, 2014
Therein lies the rub...

Dr_toad
Jul 16, 2014
This comment has been removed by a moderator.
nkalanaga
3.7 / 5 (3) Jul 16, 2014
"Another advantage in comparison to Wi-Fi is that there is no way to hack the signal since the internet is transmitted by light, there is no way to "steal it"."

Light can be "hacked" just as easily as radio. All you need is a transceiver exposed to the light. If all you want to do is intercept it, a mirror can direct the signals anywhere you want to hide the receiver.
earlvanze
5 / 5 (3) Jul 17, 2014
10 GigaBYTES is not the same as 10 GigaBITS. "this technology began with an internet speed of two Gigabits per second, but Sisoft along with researchers from the Autonomous Technological Institute of Mexico (ITAM) adapted the system to be multiplied five times."

2Gb * 5 = 10Gb not equal to 10GB (which is 8 times 10Gb).
vipinpgx
4 / 5 (4) Jul 17, 2014
U mean Optical fiber communication without fiber
Whydening Gyre
5 / 5 (2) Jul 17, 2014
"The Li-Fi device circulates data via LEDs that emit an intermittent flicker at a speed imperceptible to the human eye."

How did you miss it?

I think he felt you could receive the data from an LED light source, but would require a xmission source/protocol to return data, subsequently requiring a light receiver in the led light...
nkalanaga
5 / 5 (2) Jul 17, 2014
vipinpgx: Exactly.
edernolli
not rated yet Jul 18, 2014
Interesting speed of transmitted data
Eikka
5 / 5 (2) Jul 18, 2014
How does it deal with a situation where the reciever doesn't have a direct line of sight with the transmitter?

I.e. you put yourself between the LED bulb and the computer.

Surely it cannot maintain a signal through diffuse reflections from random objects that may introduce any amount of distortion and self-interference to phase and frequency?
nkalanaga
5 / 5 (2) Jul 18, 2014
Eikka: Good question. Infrared TV remotes work fine when bounced off ceilings or walls, but they send very simple signals.

At 10 Gigabytes/second, and 300,000 km/sec light speed, each bit would be less than a centimeter long. With a clear view of the light, it would overwhelm reflected noise. Blocked, the reflected signals would arrive at different times depending on the signal path, and all the receiver would see is random noise. That could be a big problem for mobile devices, and an issue for anywhere the device or user can be repositioned.

It would also mean that only one light in a room could be used for transmissions. Otherwise they'd interfere with each other. Simply modulating the building-wide power wouldn't work.
bluehigh
5 / 5 (1) Jul 19, 2014
Could the Li-Fi use a modulated carrier frequency to avoid interference by multiple transmitters? Like WiFi, multiple channels to avoid interference.
kees_hessels
not rated yet Jul 19, 2014
This is not invented by them, it is invented by a dutchman how showed it on ted about a year ago.
kees_hessels
not rated yet Jul 19, 2014
this dutchman (how's name i forgot) demonstrated it to be extremely fast with what looks like a normal led light bulb, and extremely sensitive you could not see the lightbulb flikering or anything. it was really cool to see this. Apparently this journalist has not done his homework...
nkalanaga
not rated yet Jul 19, 2014
Bluehigh: Certainly, and it wouldn't be hard to do. It wouldn't solve the multiple-path issue, but would allow multiple transmitters in the same area.
kees_hessels
not rated yet Jul 20, 2014
This is the link to the ted article.
This converence has been filmen in july 2011
http://www.ted.co...ght_bulb