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The LiFi Technology

Done By Chintan mehta

chintan mehta

on 9 September 2013

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Transcript of The LiFi Technology

The LiFi Technology
Li-Fi is a label for wireless-communication systems using light as a carrier instead of traditional radio frequencies, as in Wi-Fi.

The term was first used in this context by Harald Haas in his 2011 TED Global talk on visible light communication.

Demonstration 1
Haas used a table lamp with an LED bulb to transmit a video of blooming flowers that was then projected onto a screen behind him. During the event he periodically blocked the light from lamp to prove that the lamp was indeed the source of incoming data. At TEDGlobal, Haas demonstrated a data rate of transmission of around 10Mbps -- comparable to a fairly good UK broadband connection. Two months later he achieved 123Mbps.

Demonstration 2
The technology was demonstrated at the 2012 Consumer Electronics Show in Las Vegas using a pair of Casio smartphones to exchange data using light of varying intensity given off from their screens, detectable at a distance of up to ten meters.

Working in brief
Li-Fi technology works by rapidly turning on and off a light source, creating binary code. The flashing of the light actually happens much faster than the human eye can detect, allowing for a Li-Fi data connection to resemble a simple LED bulb.

The working of LiFi
By fast and subtle variations of the current, the optical output can be made to vary at extremely high speeds. This very property of optical current is used in Li-Fi setup. The operational procedure is very simple-, if the LED is on, you transmit a digital 1, if it’s off you transmit a 0. The LEDs can be switched on and off very quickly, which gives nice opportunities for transmitting data.

What is required ?
->Some LEDs.
->A controller that codes data into the LEDs.
->One person who has to vary the rate at which the LED’s flicker depending upon the data we want to encode.

Some advancements
Further enhancements can be made in this method, like using an array of LEDs for parallel data transmission, or using mixtures of red, green and blue LEDs to alter the light’s frequency with each frequency encoding a different data channel.

Results of the advancements
Such advancements promise a theoretical speed of 10 Gbps – meaning one can download a full high-definition film in just 30 seconds.

Advantage 1
Light is inherently safe and can be used in places where radio frequency communication is often deemed problematic, such as in aircraft cabins or hospitals.

Advantage 2
Not only has the potential to solve the problem of lack of spectrum space, but can also enable novel application.
Advantage 3
The visible light spectrum is unused, it's not regulated, and can be used for communication at very high speeds.

1.) Distance
Although the speeds are less than what they are for gigabit Ethernet, the power of the beam can allow DVD-quality streaming of video to any location connected to the Li-Fi device.

2.) Cost
Instead of running close to a mile worth of cable, the LED-powered Li-Fi connection could be used to beam the information directly to the destination. Using a point-to-point array, office buildings can stay connected to each other without the use of additional cables being laid from one access point to another.

3.) Game Consoles
This would allow the unit to be place literally anywhere within the room as long as there is a direct line of sight to the sensor. Could you imagine a game system like the Xbox using a Kinect and all of it being completely wireless except for the power going into the unit? That will be tackled once wireless energy is perfected for practical home use.
Daily Uses of LiFi
Can be used in the places where it is difficult to lay the optical fiber like hospitals. In operation theatre LiFi can be used for modern medical instruments.
In traffic signals LiFi can be used which will communicate with the LED lights of the cars and accident numbers can be decreased.
Thousand and millions of street lamps can be transferred to LiFi lamps to transfer data.
In aircraft LiFi can be used for data transmission.
It can be used in petroleum or chemical plants where other transmission or frequencies could be hazardous.

just, if you may want to see Harald Haas' ted-talk.
Full transcript