This is about Li-Fi technology

2. TECHNOLOGY
PRESENTED BY
A.MUBEENA BEGAM
R.UTHRA
II B.C.A.,

3. Contents
Introduction
History
Needs for Li-Fi
 Li-Fi vs Wi-Fi
construction of Li-Fi
 Working Process
Applications
Advantages
Challenges for Li-Fi
Draw backs of Li-Fi
Conclusion

4. Introduction

5. Introduction
Light-Fidelity
Light is used instead of Radio-waves to
transmit information
Transceiver fitted LED lamps acts like Wi-Fi modems
Li-Fi is transmission of data through illumination, sending
data through a LED light bulb that varies intensity faster
than human eye can follow.

6. History of Li-Fi
FOUNDER :
Prof. Harald Haas
CO-FOUNDERS :
Dr. Gordon Povey Dr. Mostafa Afgani

7. Needs for Li-Fi :
Radio spectrum is congested, but the demand for
wireless data doubles each year
 Issues regarding radio spectrum, such as capacity,
availability, efficiency, security are solved using LIFI
.
 Speed of data transmission can be increased.

8. Radio Spectrum
Issues regarding Radio Spectrum

9. Electromagnetic Spectrum

10. Li-Fi vs Wi-Fi

12. Li-Fi

13. Construction of Li-Fi :
The Li-Fi product consists of four primary sub-
assemblies:
 Bulb
 RF power amplifier circuit(PA)
 Printed circuit board
 Enclosure
Transmitting Elements :
i) LED ii)fluorescent lamps
Receiving Elements :
i)Photo diode ii)Image sensor

14. Working Process
 Operational procedure is very simple, if the led is on, you transmit a digital
1, if its off you transmit a 0. The LEDs can be switched on and off very
quickly, which gives nice opportunities for transmitting data. Hence all that
us required is some LEDs and a controller that code data into those LEDs.
 We have to just vary the rate at which the LED’s flicker depending upon
the data we want to encode .
 Thus every light source will works as a hub for data transmission .

15. Working process :

16. How Li-Fi Works ?

17. Application Areas
Li Fi technology is still in its infancy .However some areas
where it seems perfectly applicable are:-
1 . 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.

18. Potential Application of Li-Fi
 2. Hospitals(In Few Medical Equipments) :

19. Potential Application of Li-Fi
3.Lecture and seminar halls
 Downloading notes from blogs of teachers
Interactive classroom with interconnected devices
Sharing views & queries with the entire class

20. Potential Application of Li-Fi
4. 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 waves ,Li-Fi is
introduced.

21. Potential Application of Li-Fi
5. On Ocean Beds :
Li-Fi can even wok underwater were Wi-Fi fails
completely, thereby throwing open endless opportunities for
military/navigation operations.

22. Potential Application of Li-Fi
6. Offices :
 Alternative to optical fiber
 Encoded Transmissions
 Cheaply cost
 Gives security

23. Potential Application of Li-Fi
7.Product Retailing :
High speed web access through lighting in
malls a customer can passively gather data about
reviews and pricing of any product on display
Service of secure high speed connection to
simulate your experience researching and purchasing
at home:

24. Potential Application of Li-Fi
• There are millions of street lamps deployed around the world.
 8. Street Lamps (As free Access Points)
• Each of these street lamps could be a free access point.

25. Advantages :
10000 times more spectrum than RADIO
WAVES.
light is present everywhere.
Data is present where light is present
Highly efficient because LED consumes
less energy
Efficient alternative to radio based wireless ;
since it is quick and reliable

26. Limitations or Challenges
 Light can't pass through solid objects .
 Interferences from external light sources like sun light, normal
bulbs, and opaque materials in the path of transmission will cause
interruption in the communication.
 A major challenge facing Li-Fi is how the receiving device
will transmit back to transmitter.
Data transmission can be easily blocked by any object placed in
front of LED source


27. Drawbacks of Li-Fi
Li-Fi doesn’t work in the dark or outdoors.
Li-Fi has a big drawback compared to Wi-Fi,
unlike Wi-Fi we cannot move to other rooms
unless there are wired bulbs too.

28. Conclusion
Thus, if Li-Fi technology can be put into practical use, every
bulb can be used as an alternative to Wi-Fi hotspots. It
provides simple, faster and efficient wireless data
communication. Li-Fi will make us to proceed towards the
cleaner, greener, safer and brighter future.

30. ANY QUERIES???