This is a technical persentation about Li-fi Technology, hope it will help you enhance your knowledge.

1. Anees Ahmed
11cs21@quest.edu.pk

2. HOW WE ARE CONNECTED TO INTERNET
Wired
• Dial-up
• DSL
Wireless
• Broadband (evo)
• Satellite
• Wi-Fi

3. PRESENT SCENARIO
1.4 Million 5 Billion

4. ISSUES REGARDING RADIO SPECTRUM

5. WHO CAN REPLACE
RADIO WAVES FOR WIRLES
COMMUNICATION
?

7. WHAT IS LI – FI ?
• transmission of data through illumination
• LED light bulb

8. HISTROY
• The technology began
during the 1990‘s.
• Coined by Edinburgh
University's Prof Harald
Haas.
HARALD HASS

9. WORKING PRINCIPLE
• LED switch on/off
• Require LED and controller to code data into
LED.

10. WORKING PRINCIPLE

12. Radio
Waves
Infrared
Rays
Visible
Rays
Ultraviolet
Rays
X- Rays
Gama Rays
HENCE WE LEFT WITH THE ONLY THE VISIBLE - LIGHT
SPECTRUM.
WHY VLC ONLY
?

13. LI-FI
•Light power(LED)
•Multiple data stream
•High speed
•Technologies used in LI-FI: SIM-OFDM and Spatial
modulation

14. LI-FI

15. DIFFERNCE BETWEEN TECHNOLOGIES

16. POTENTIAL APPLICATION OF LI-FI
TRAFFIC LIGHTS

17. INTRINSICALLY SAFE ENVIRONMENTS
POTENTIAL APPLICATION OF LI-FI

18. PUBLIC INTERNET HOTSPOTS
POTENTIAL APPLICATION OF LI-FI

19. ON OCEAN BEDS
POTENTIAL APPLICATION OF LI-FI

20. ADVANTAGES
• Larger bandwidth (10,000 times the radio bandwidth)
• High efficiency
• More availability
• Highly secure

21. DISADVANTAGE
• Presence of Light is essential

22. CONCLUSION
The possibilities are numerous and can be
explored further. If this technology can be
put into practical use , every bulb can be
used something like a Wi-Fi hotspots to
transmit wireless data.

23. REFERENCES:
• [1] anyfi.net/documentation
• [2] www.independent.co.uk/news/science/lifi-revolution-internet-connections-
using-light-bulbs-are-250-times-faster-than-broadband-8909320.htm
• [3] http://www.extremetech.com/extreme/147339-micro-led-lifi-where-every-light-
source-in-the-world-is-also-tv-and-provides-gigabit-internet-access