tiny variation in the rapid dimming of LED bulbs is then converted

acknowledged as the fastest medium . This fastest medium

by the ' receiver ' into electrical signals .

is about to provide us an internet network that would give data speed of 224 gigabits per second . Yes , we are talking about

Li-Fi .

The signal is then converted back into a binary data stream that is recognized by the electronic devices as web , video and audio inputs , running on internet devices .

Light Fidelity or Li-Fi is a Visible Light Communications ( VLC ) system that runs wireless communications travelling at very high speeds . As our hunger for faster data is ever swelling , imagine a technology which allows one to download data at 200 + gigabits per second speed .

The visible light communication ( VLC ) technology theory dates back to the 1880s , is about any utilisation of visible light portion of the electromagnetic spectrum to transmit information . It functions on visible light between 400 and 800 terahertz ( THz ).

Similar to an incredibly advanced form of Morse code - where

Li-Fi is a bi-directional , high-speed and fully networked wireless

switching a torch on and off in a certain pattern can relay a secret

communication technology that is similar to Wi-Fi . It is a form of

message , flicking a LED on and off at extreme speeds can be used

visible light communication ( VLC ) and a division of optical wireless

to write and transmit things in binary code .

communications ( OWC ) that could be a complement or even a replacement to RF communication in Wi-Fi or cellular networks in contexts of data broadcasting .

Like Wi-Fi , Li-Fi also transmits data electromagnetically . Wi-Fi requires radio waves while Li-Fi runs on visible light . The technology just requires the simple household LED ( light emitting diodes ) bulbs with a detector , to enable data transfer .

It contains a photo-detector for receiving light signals and a signal processing element then converts the data into ' stream-able ' content .

How did it begin ?

The Li-Fi technology has been discovered by Professor Harald

Haas , Chairman of Mobile Communications in University of

Edinburgh , who coined the term Li-Fi during a TED Talk show , in

Scotland , in 2011 .

Harald disclosed his vision of " Wireless data from every light ”, i . e . by flickering light from a single LED , far more data could be transmitted than from a cellular tower . This means that LED light bulbs will then be turned into super-speed broadband wireless

Internet systems

How does it work ?

After four years of research , in 2012 , Haas co-founded the

The LED light bulb is a semiconductor light source , so it means

company ‘ pureLiFi ’ with the aim ' to be the world leader in Visible

that the constant current of electricity supplied to a LED light bulb

Light Communications technology '. ‘ pureLiFi ’, formerly ‘ pureVLC ’,

manipulated up and down at extremely high speeds . This is

is an original equipment manufacturer ( OEM ) firm set up to

processed at such a speed that human eye cannot detect the

commercialise Li-Fi products for integration with existing LEDdifference

.

lighting systems .

The data is supplied into the LED light bulb , enabled with signal

Usage & Applications

processing technology , which then sends the embedded data in its beam at swift speed to the photodetector or photodiode . This

The trial phase of Li-Fi has already been initiated in offices and industrial environments . After the application of Li-Fi in Tallinn ,