lifi ppt

1. NAME: HIMANSHU SHAKYA
COURSE: B.TECH (2 YEAR)
BRANCH: CSE
TOPIC: LI-FI (LIGHT FIDELITY)
INDUS INSTITUTE OFTECHNOLOGY
& MANAGEMENT (KANPUR)

3. FOUNDER OF LI-FI
1) The term Li-Fi was coined by, Professor
Harald Haas
2) Ted-globalTalk back in 2011 where he
demonstrated Li-Fi for the first time.

4. LI-FI (LIGHT FIDELITY)
• Li-Fi is high speed
bidirectional networked
• Communication of data
using visible lights
• LiFi is a category of Optical
Wireless Communications
(OWC)
•Li-Fi is 1000 times faster
than the Wi-Fi

5. NEED OF LI-FI
• Radio spectrum conjusted,
but the demand for wireless
data doubles each year
• Issues regarding radio
spectrum, such capacity,
availability, efficiency, security
are solved using Li-Fi
• Speed of data transmission
can be increased

7. HOW IT WORKS…?
• All the data from Internet is streamed into lamp
driver.
• Data from internet is used to modulate the intensity
of LED light source.
• Thus by fast and subtle variations of current, optical
output can be made to vary at extremely high speed
• The photodetector picks up the signal
•The receiver dongle then converts the tiny changes in
amplitude into a data stream

8. Li-Fi NETWORK
• Li-Fi connector and router are the main
components for a network
• Room connector:
1. Optical signals cannot penetrate
through walls, in order to provide an
opticalWLAN, rooms need to be
connected with each other
2. Li-Fi room connector is a replicator,
which sends the data stream from one
side of the wall to the other side via an
optical fiber.
3. For smaller rooms, connector act as
the only Li-Fi hotspot in the room

9. APPLICATIONS……..

10. Li-Fi can be used in:
1) In Hospitals- Places where it is difficult to lay optical fibers like
operation theaters

11. 2)Traffic scenarios, thereby reducing accidents

12. 3) Used in Radio Frequency restricted environments like
chemical industries, nuclear power plants, petrol pumps

13. 4) In offices: such as laptop, printer,ac,etc

14. 5) Li-Fi can be more useful at the time of
disaster such as earthquake or floods

15. ADVANTAGES
• Data rate greater than 10 Gbps
• Can be used anywhere, even in RF restricted
areas; Since light waves will not interfere with
radio waves.
• Mostly LED light bulbs are used, which
consumes less energy. Hence cost efficient.
• As light waves cannot penetrate through walls,
the data cannot be intercepted;Thus provides
secured communication.

16. LIMITATIONS
• Visible light cannot penetrate through solid
objects.
• Interferences from external light sources like
sunlight, in the path of transmission will cause
interruption in the communication.
• Data transmission can be easily blocked by any
object placed in front of LED source.

17. CONCLUSION
Thus, if Li-Fi technology can be put into practical
use, every bulb can be used as an alternative to WiFi
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.

18. THANK YOU………..