Li-Fi uses light from LED bulbs to transmit data wirelessly. It was pioneered in the 1990s but is now gaining more attention as an alternative to congested radio spectrum networks. Li-Fi works by varying the intensity of LED light faster than the human eye can detect to transmit digital signals. It has applications in traffic lights communicating with cars, hospitals where Wi-Fi can interfere with equipment, airplanes where radio waves don't work well, and under water where Wi-Fi fails. Advantages include higher speeds than Wi-Fi and lower costs since it uses LEDs. It requires line of sight and a light source, whereas Wi-Fi works anywhere. As more devices connect, Li-Fi may provide

1. Government Polytechnic Aurangabad
Li-Fi
Rushikesh Mutekar
147035
Guide by : Ms. Deshpande
Mam

2. Seminar on
Li-Fi(Light-Fidelity)

3. Content
Introduction
History
Present Scenario
Working Process
Applications
Advantages & Disadvantages
Li-Fi vs Wi-Fi
Conclusion

4. Introduction
What is Li-Fi ?
Light-Fidelity
LI-FI is transmission of data through illumination, sending
data through a LED light bulb that varies intensity faster
than human eye can follow.

5. History
 The technology truly began
during the 1990's in countries
like Germany, Korea, and
Japan where they discovered
LED's could be retrofitted to
send information. Harald
Haas continues to wow the
world with the potential to
use light for communication .

6.  Radio Spectrum is congested but the
demand for wireless data double each year
.Every thing, it seems want to use wireless
data but the capacity is drying up.
Present Scenario
1.4 million Base Stations 5 Billions Users

7. How Li-Fi Works ?
On 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 .
A 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 .

10. Application Areas
Li Fi technology is still in its infancy .However some areas
where it seems perfectly applicable are -
 Traffic Lights -
Traffic lights can communicate to
the car and with each other. Cars
have LED-based headlights, LED-
based cack lights, and cars can
communicate with each other and
prevent accidents in by
exchanging information.

11. Application Areas
Visible Light is more safe than RF, hence it can be used in places
where RF can't be used such as petrochemical plants .
 Intrinsically Safe Environment -

12.  Hospital (In Few Equipment)
Application Areas

13. Application Areas
 Airlines -
Whenever we travel through airways we face the
problem in communication media ,because the whole airways
communication are performed on the basis of radio waves. To
overcome this drawback on radio ways , li-fi is introduced.

14. Application Areas
 On Ocean Beds -
Li-Fi can even wok underwater were Wi-Fi fails completely, thereby
throwing open endless opportunities for military/navigation operations.

15. Application Areas
There are millions of street lamps deployed around the world.
Street Lamps (As free Access Points) -
Each of these street lamps could be a free access point.

16. Advantages
 It is impossible to achieve more than 10Gbps,
theoretically allowing a high-definition film to be
downloaded in 30 sec.
 Mostly powered by LEDs so it is cost efficient
 Transmission of data is fast and easy.

17. Disadvantages
 Presence of light is essential
 There should be line of sight
 Works better with fluorescent light and LEDs but
very low efficiency with bulbs

18. Li-Fi vs Wi-Fi

19. The concept of Li-Fi is currently attracting a great deal of
interest, not least because it may offer a genuine and efficient
alternative to radio-based wireless.
As a growing number of people and their devices access
wireless internet, the air waves are becoming increasingly
clogged, making it more and more difficult to get a reliable,
high-speed signal.
Conclusion