What is lifi, light fidelity, history of lifi, lifi vs WiFi, uses of lifi , advantages and disadvantages of lifi, my conclusion about it.

2. INTRODUCTION
 Li-Fi is a wireless optical networking technology
that uses LED for data transmission.
 It is designed to use LED light bulbs.
 It is transmitted by the LED bulbs and received
by photo receptors.
 uses visible light communication or infrared and
near ultraviolet.

3. HISTORY
 The technology truly began in 1990’s in countries like
Germany, Japan and Korea where they discovered that LED
could be used to transfer information.
 Professor Harald Haas of UK(Scotland) – officially
recognised as founder of Li-Fi.
 Professor Haas started working in this concept from
January 2010.
 He promoted about this concept in 2011 in TED global talk.

4. Professor Harald Haas

5. How LI-FI works?

6. Why li-fi is better than
current technology?
CAPACITY
EFFICIENCY
AVAILABILITY
SECURITY

7. Real Time Usage of Li-Fi

8. Li-Fi Vs Wi-Fi

9. APPLICATIONS
 Underwater communications
 Safety and management
 Health sector
 Internet anywhere

10. Uses of Li-Fi
 Traffic lights:
 Traffic light can communicate with vehicles and
with each other.
 Cars have LED based headlight so that cars can
communicate with each other and hence
preventing accidents.

11. Uses of Li-Fi
 Bringing out safe environment:
 Visible light is more safe than radio waves
hence it can be used in places where RF can not
be used such as petrochemical plant, airplanes
etc.

12. Uses of Li-Fi
 On ocean beds:
 Li-fi can even work underwater where wi-fi
completely fails, therefore throwing endless
opportunity for military or navigation
operations.

13. Uses of Li-Fi
 Public internet hotspots:
 There are millions of street lamps around the
world.
 Each of these street lamps could be free access
point.

14. DISADVANTAGE
Nothing in this world is perfect and so does LIFI.
These signals cannot penetrate objects. So the
person needs wired bulb in that room also.
Interferences from external light sources like
sun, light, normal bulbs, opaque materials.
High installation cost of the VLC systems.

15. CONCLUSION
 The possibilities are numerous and can be
explored further.
 If his technology can be put into practical use,
every bulb can be used something like a Wi-Fi
hotspot to transmit wireless data and we will
proceed toward the cleaner, greener, safer and
brighter future.

16. REFERENCE
www.google.com
www.Wikipedia.com
www.purelifi.com

17. THANK YOU
Presented by.,
M.Saishankar