These technology is new and it is very faster and more secure then then the WI-FI.And these technology will be used in some countries. It is in demonstrating stage.

1. Presented By,
S.Hari Krishna,
Master in computer applications ,
Yogi vemana university,
Kadapa.

2.  Introduction
 History
 Present Scenario
 How lifi works
 Lifi vs Wi-Fi
 Applications
 Advantages
 Dis advantages
 conclusion
Contents

3. Lifi means light fidelity
Lifi is fast and cheap optical version on Wi-Fi
Lifi is a Technology that uses the light emitting diode
to transmit the data wirelessly
Lifi is based on visible light communication (vlc)
Introduction

4.  This technology was invented by
German physicist “HARALD HASS”,
From the university of Edin burgh
In U.K
 He Demonstrated in the year 2012
History

5. Li-fi Atmosphere

6. Radio spectrum is congested but the demand for wireless
data double each other. Every thing It seens to want to use
wireless data but the capacity is drying up.
Present Scenario
1.4 million Base Stations 5 Billion

7. Capacity:-
Radio waves
Cost and expensive
Less band width compared to other spectrum
Efficiency:-
For billions of stations consume huge amount of energy for
1. Transmitting the radio waves
2. To cool base the station cabins
Radio spectrum
 Issues regarding radio spectrum

8. Availability:-
Available with in the range of base station
Limited availability
Unavailable in aircrafts
Security:-
Less secure
Radio spectrum issues

10. Gama rays:- it cant be used as they could be dangerous
X-rays :-have similar to health issues
Ultraviolet light:-is a good for place with out people, but
otherwise dangerous for human body
Infrared :- due to the eye to eye safety regulation, can only
used be used with low power
Hence we left with the only the visible light spectrum
Why only vlc ?

11. One end all the data on the internet will be streamed to a
lamp driver when the led is turned on the microchip converts
the digital data in form of light
All the light sensitive device (photo detector) receives the
signal and converts.it back into original data this method of
using rapid pulses of light to transmit information wirelessly is
technically referred as visible light communication
How lifi works

13. LI-FI VS WI-FI
Comparison between li-Fi & Wi-Fi
S.NO Parameters Wireless technology
Light fidelity Wireless fidelity
1 Speed for data transfer Faster transfer speed >1 Gbps Data transfer
speed(150mbps)
2 Medium which through
the data occurs
Used light has a carrier Used radio spectrum
3 Spectrum range Visible light has 10,000 >Rf Rf spectrum range is <
vls
4 Cost Cheaper than the Wi-Fi based
free band doesn’t need
license and its use light
Expensive in
comparison to lifi
because it uses radio
spectrum
5 Network topology Point to point Point to point
6 Operating frequency Hundreds of tera HZ 2.4 GHz

14. TRAFFIC SCENARIO
 In traffic scenario, LIFI can be used to
communicate with the LED lights of
cars .
 Cars can have LED-based headlights,
backlights and can communicate with
each other.
 This might prevent accidents, by
exchanging information, when the
vehicles are too close
 Using LIFI, Street lights can be used
to send information about the road
condition to the car.
APPLICATIONS:-

15. LECTURE / SEMINAR HALLS
 Downloading notes from blogs of teachers
 Often it is necessary to download lecture
notes from the blogs of respective teachers.
With Li-Fi, the download can be done in
the hall itself
 Interactive classroom with interconnected
devices
 The classroom will be more interactive with
the real-time interconnectivity between 500
devices
 Sharing views & queries with the entire class
 Each person’s queries, views and
clarifications can be shared not only with
the teacher, but with the entire class.

16. INDUSTRIES
 Used in RF restricted environments like chemical
industries,
 nuclear power plants, petrol pumps

17. AIRCRAFTS
The whole airways
communication are performed on
the basis of radio waves.
Hence passengers face the
problem in communication
media.
This problem can be overcome
by using Li-Fi, since light waves
will not interfere with radio
waves.

18. Li-fi can even work under water were Wi-Fi fails
completely .There by throwing open endless
opportunities for military/navigation operations
Ocean beds

19. Vlc smartphones
 The first VLC Smartphone was
 presented by Consumer Electronics
in
 January, 2014
 The phone uses Wysips connect – a
 clear thin layer of crystal glass is
 added to the small screens
 Smartphone makes them solar
 powered.
Smartphone could get 15% more
 battery life in a day
Can communicate using Li-Fi.

20. Capacity:
 10000 times more spectrum than RADIO WAVES.
 Light boxes are already present, so infrastructure is available
already and installed.
Availability:
 Light is present everywhere.
 Data is present where light is present
Efficiency:
 Highly efficient because LED consumes less energy
Advantages of li-fi

21. Dis advantages of li-fi
 Light can’t pass through objects
 Connectivity while moving
 Interference's from external light sources like sunlight,
normal bulbs. And apaque materials in the path of
transmission will cause interruption in the communication

22. CONCLUSION
 The possibilities are numerous and can be explored further.
 If this technology can be put into practical use, every bulb can be used something like
a Wi-Fi hotspot.
 we will proceed toward the cleaner, greener, safer and brighter future.
 This may solve issues such as the shortage of radio-frequency bandwidth.
 Allows internet where traditional radio based wireless isn’t allowed such as aircraft or
hospitals.

23. Thank you