Li-Fi - The Future is Here

what is li-fi ?

Li-Fi stand for "Light Fidelity"  which is a Visible Light Communications (VlC) system running wireless communications  at very high speed.

Li-Fi uses common household LED (light emitting diodes) light bulbs to  transfer data with a boating speed of around 200-300 GB per second.

The term Li-Fi was  given by Professor Harald Haas in 2011 during a tech talk. Haas explained that  light bulbs could also act as  wireless routers and even better than them.

Even after it Haas launched a company named Purelifi  to become world  leader in VLC system.

How it works ?

Li-Fi and Wi-Fi are similar to each other as both transmit data electromagnetically. Although Wi-Fi uses radio waves while Li-Fi runs on visible light.
As we now know, Li-Fi is a Visible Light Communications (VLC) system. This means that it uses  a photo-detector to receive light signals and uses processor element which converts data into a streaming content.
An LED light bulb is a semi-conductor light source meaning that the constant current of electricity supplied to an LED light bulb can be dipped and dimmed, up and down at extremely high speeds, without being visible to the human eye.
 
The tiny changes leads to  rapid dimming of LED bulbs which  is  then converted by the 'receiver' into electrical signal.
These signals are then converted into binary system which we view as video images applications which runs on internet.

Here is a block diagram to explain better.

               

Lifi vs  WiFi 

Lifi uses light  for transferring  signals on the other hand WiFi  uses radiation to transfer signals. lifi can give up to a speed of 200-300 GB per second while WiFi can't.However WiFi  is also better in some cases.WiFi can  transfer signals through walls but lifi can't so for that you have to be in the range if light.WiFi has more range then lifi but lifi is more secure than WiFi hence it the best technology for security reasons.

LIFI IN DEVICES 

Lifi is going to be launched in upcoming devices and gadgets from Apple  in iPhone.

LIFI IN INDIA 

 There are currently two  lifi devices available in India.
Li-Flame Ceiling Unit to connect to an LED light fixture and Li-Flame Desktop Unit which connects to a device via USB, both aims to provide light and connectivity in one device with faster connectivity and data transmission in a secured way.

Thank you for reading please do comments.