This is one of the most emerging technology for the transmission of information over light. Transmission over light is faster than any other in the universe. because the light is the fastest thing in the universe.

1. LI-FI TECHNOLOGY
presentation by
N.Vibichant,
V.Soundarrajan,
ECE 2nd year

2. CONTENT
 Introduction
 History
 What is li-fi technology?
 How it works?
 Real time usage
 Comparing with others
 Li-fi over wi-fi
 Application
 Advantages
 Disadvantages
 conclusion

3. INTRODUCTION
 Li-Fi stands for Light-Fidelity.
 LiFi is a wireless optical networking technology that
uses light-emitting diodes (LEDs) for data transmission.
 Hass envisioned lights bulbs that could act as wireless
routers.
 LiFi data is transmitted by the LED bulbs and received
by photoreceptors.

4. HISTORY
 The idea of Li-Fi was introduced by a German physicist,
Harald Hass, from the University of Edinburgh in the
UK
 He coined the term Li-Fi at TEDGlobal conference in
Edinburgh on 12th July 2011
 At TEDGlobal, Haas demonstrated a data rate of
transmission of around 10Mbps
 Two months later he achieved 12.3Gbps.

5. WHAT IS LI-FI?
 Li-fi is bidirectional, high speed and fully networked
wireless communications similar to Wi-Fi. It is based on
Visible Light Communication (VLC).VLC is a data
communication medium, which uses visible light
between 400 THz (780 nm) and 800 THz (375 nm) as
optical carrier for data transmission and illumination.It is
faster as 70Mhz/cycle

6. HOW IT WORKS?
 Cloud LAN server LED bulbs photo detector
systems

7. REAL TIME USAGE

8. COMPARING OTHER TECHNOLOGY
technology Speed
Fire wire 800 Mbps
USB 3.0 5 Gbps
Thunderbolt 20 Gbps
Bluetooth 3 Gbps
Wi fi 150 Mbps
IrDA 4 Gbps
Li-fi technology 10 Gbps

9. LI-FIOVERWI-FI
S.NO
BASIS OF
COMPARISON
WI-FI LI-FI
1 Security
Can be
hacked
Cannot be
hacked
2 Data transfer rate slower Much faster
3 Range Small Large
4 Traffic control Less High
5
Where can be
used
Within range
of WLAN
Anywhere can
light be present
6 Cost Costly Cheap
7 Working concept
Various
topologies
Direct binary
data transfer

10. HOW IT IS DIFFERENT?
 Li-Fi technology is based on LEDs for the transfer of
data.
 The transfer of the data can be with the help of all kinds
of light, no matter the part of the spectrum that they
belong.
 That is, the light can belong to the invisible, ultraviolet
or the visible part of the spectrum.

11. RECENT ADVANCEMENT
 Researchers at the Heinrich Hertz Institute in Berlin,
Germany, have reached data rates of over 500 megabytes
per second.
 A consortium called Li-Fi Consortium was formed in
October 2011.
 According to the LiFi Consortium, it is possible to
achieve more than 123 Gbps of speed.
 Theoretically which would allow a high-definition film
to be downloaded in just 30 seconds.

12. APPLICATION
 Education system:-
fast internet access,
easy transferable.
 Medical applications:-
Radiation free,
Wi-fi can’t but li-fi can.
 Aircrafts:-
Internet can access,
No radio waves.

13.  Underwater options:-
 Wired & wireless ROVs-hard to receive signal
from surface,
 Li-fi can make it easy because light can pass
through.
 Replacements:-
 Li-fi doesn’t works using radio waves,
 Can replace bluetooth,wi-fi etc…

14. ADVANTAGES
• 10000times wider bandwidth.
• Data rate up to 10 Gbps.Capacity:
• Very Cheap,
• Less energy & high efficiency.Efficiency:
• Light is available everywhere.
• LEDs for proper data transmission.Availability:
• Light can’t penetrate through objects.
• It can’t be hacked.Security:

15. DISADVANTAGE
Accessi
bility:
• Light can’t be passes through objects.
Transm
ission:
• Difficulty in receiving back to transmitter.
Cost:
• Installation cost is high.
Interfer
ence:
• May interfere with other sources like sun
lights etc…

16. 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

17. Thank you