Li-Fi is a system of wireless communication that uses light from LED bulbs to transmit data. It was developed as a solution to increasing radio spectrum congestion from the growing number of wireless devices. The document discusses how Li-Fi works by modulating the light intensity of LED bulbs to transmit data. It provides advantages of Li-Fi over Wi-Fi such as improved security since light cannot pass through walls, reduced interference with devices, and greater available bandwidth from light spectrum. Potential applications discussed include using car headlights to transmit traffic information to improve flow.

1. LI-FI
1
LIGHT
FIDEALITY!PRESENTED BY :
Taoufik FADILI
Mohamed Amine SABRI

2. 2
What we are going to Discuss :
1. Introduction
2. What is Li-Fi ?
3. History of Li-Fi
4. How Li-Fi works
5. The different between Li-Fi and Wi-Fi
6. Conclusion

3. Introduction
3
Wireless communication is the transfer of
information between points that are not
connected by an electrical conductor. The
most common wireless technologies use radio
waves but the demand for wireless data
double each year, there 3,5 billion internet
users, 19 billion global networks connections
(mobile and fixed) that means the capacity is
drying up.

4. 4
WHO CAN REPLACE
RADIO WAVES FOR WIRELESS
COMMUNICATION ?

5. 5
LI-FI (LIGHT FIDEALITY)

6. What is LI-FI?
6
Li-fi is a system of wireless transmission of
data using light as a medium of
communication. It was developed as a
solution to the growing radio spectrum
congestion problems.

7. 7
History of LI-FI :
The technology began during the 1990's in
countries like Germany, Korea, and Japan where
they discovered LED could be retrofitted to send
information. Professor Harald Haas and his
research team first developed the modern
concept of Li-Fi at the University of Edinburgh.

8. How LI-FI Works ?
8

9. 9
The difference between Li-Fi and Wi-Fi :
•SAFETY
Wi-Fi creates Electromagnetic Interference (EMI), known to
interfere with airplanes’ instruments and equipment in hospitals,
and is potentially dangerous in hazardous operations, such as
power/nuclear generation. Li-Fi uses light instead of radio
waves, which is safe and does not create EMI.
•SECURITY
Radio waves pass through walls and ceilings. Light doesn’t. There
in lies the difference in data security between Wi-Fi and Li-Fi. A
hacker, outside a building can tap into the Wi-Fi data
communications of computers inside the building. Data
communicated via Li-Fi can only be accessed where the LED
light illuminates.

10. 10
•ON THE OCEAN
Li-Fi can even wok underwater were Wi-Fi fails completely, with Li-Fi
military vehicules can communicate very high speed via LED light.
•CONGESTION
Wi-Fi uses radio frequencies, and these are very limited .
Computers, laptops, printers, smart TVs, smartphones and
tablets must compete for bandwidth, that is causing
congestion, and degrading data communications. Li-Fi uses
the frequencies of light waves, which are up to 10,000 times
more plentiful than radio frequencies and do not compete with
Wi-Fi.

11. POTENTIAL APPLICATION OF LI-FI
Trafic : allows Car headlights to transmit information to
secure the trafic by measering distances bettween vehicules
and make it more fluid

12. 11
Li-Fi is the upcoming and on growing
technology, it is very advantageous and
implementable in various fields that can’t be
done with the Wi-Fi and other technologies.
Hence the future applications of the Li-Fi can be
predicted and extended to different plat-forms
like education fields, medical field, industrial
areas and many other fields.
Conclusion

13. THANK YOU
12