ARYA INSTITUTE OF ENGG. TECH.& MANAGEMENT

A Presentation on Li-Fi

By:- Deepak Khatri IInd Year IVth Sem Computer science Engg.

CONTENTIntroductionWhat is Li-FiWorkingLi-Fi v/s Wi-FiApplicationAdvantagesDisadvantages

INTRODUCTIONLi-Fi (Light-Fidelity)It is a high speed & fully networked wireless

communication technology similar to Wi-Fi.Li-Fi is coined by Prof. Hass harald.Prof. Haas harald , from the University of

Edinburgh in the UK.

WHAT IS Li-FiLi-Fi is a subset of optical wireless

communication.It is a wireless & uses visible light

communication or infra-red and near ultraviolet.

The Li-Fi market is projected to have a compound annual growth rate of 82 % from 2013-2018 and to be worth over $6 billion per year by 2018.

WORKINGThe Li-Fi technology light from LEDs as a

medium to deliver networked,mobile,high-speed communication in a similar manner of Wi-Fi.

Li-Fi (VLC) work by switching bulbs on and off within nanoseconds,which is too quick to be noticed by the human eye.

Light reflected off the walls can achieve 70mb/s.

Working Technology of Li Fi

Transmitting Elements

LED Fluorescent Lamp

Receiving Elements

Photo Diode Image Sensor

How Li Fi Works

Real Time Usage of Li Fi

Li-Fi v/s Wi-FiBoth Li-Fi & Wi-Fi transmit data over the

electromagnetic spectrumBut whereas Wi-Fi utilizes radio waves,Li-Fi

uses visible light.Wi-Fi is close to full capacity, Li-Fi has no

limitations on capacity.The visible light spectrum is 10,000 times

larger than the entire radio frequency spectrum.

APPLICATIONSIn AirwaysUnder water communication:- Since radio

waves cannot be used under water because these waves are strongly absorbed by sea water within feet of their transmission and this renders it unusable underwater but LIFI is suitable for underwater communication.

ADVANTAGESLi-Fi has the advantage of being usful in

electromagnetic sensitive areas as an aircraft cabins,hospitals and nuclear power plants without causing electromagnetic interference.

Researchers have reached data rates of over 10Gb/s.

Li-Fi is ten time cheaper thanWi-Fi.It is green information technology.It can be used underwater.

DISADVANTAGESThe mostly disadvantage is it has a short

range. Wi-Fi has the long range for network. It uses visible light communication instead of

Wi-Fi uses radio frequency waves, which has much wider bandwidth.

Li-Fi doesn’t work in the dark and outdoors.We can not move another room.

Any Question ?

THANK YOU