This is a small presentation on how li-fi technology works included detailed working in simple language to know exact principle of Light Fidelity

1. Bhujbal knowledge City
Institute of Technology – Polytechnic
Seminar
On
Li-Fi Technology
Anurag Sawant Harshal Sonarkar
Students of SYEJ
Department of Electronics and Telecommunication Engineering

2. Content
 Introduction
 History
 How Li-Fi Works?
 Real Time Usage of Li Fi
 Comparison between Various Technologies
 How it is different?
 Application
 Advantages
 Disadvantages
 Conclusion

3. Light Becomes Data
Imagine a world where every light connects us with unprecedented data and
bandwidth.
Imagine LiFi...
LiFi uses light to send wireless data embedded in its beam.
A LiFi enabled device converts the beam of light into an electrical signal.
The signal is then converted back into data.
The device sends back data using invisible light.
LiFi is high speed bi-directional and fully networked light communications.
We are ready to bring LiFi to the world. Are you?

4. Introduction
 LiFi is a wireless optical networking technology that uses
light-emitting diodes (LEDs) for data transmission.
 LiFi is designed to use LED light bulbs similar to those
currently in use in many energy-conscious homes and
offices.
 However, LiFi bulbs are outfitted with a chip that
modulates the light imperceptibly for optical data
transmission.
 LiFi data is transmitted by the LED bulbs and received by
photoreceptors.

5. History
 Professor Harald Haas, from the University of Edinburgh in
the UK, is widely recognised as the original founder of Li-
Fi.
 He coined the term Li-Fi and is Chair of Mobile
Communications at the University of Edinburgh and co-
founder of pureLiFi.
 Haas promoted this technology in his 2011 TED Global talk
and helped start a company to market it.
 In October 2011, companies and industry groups formed
the Li-Fi Consortium, to promote high-speed optical
wireless systems.
 The first Li-Fi smartphone prototype was presented at the
Consumer Electronics Show in Las Vegas from January 7–10
in 2014.

6. Principle of Li-FI Technology:-
Heart of li-fi technology is high brightness LED's
The LED bulb will hold a micro-chip that will do
the job of processing the data. The on-off
activity of LEDs enables a kind of data
transmission using binary codes. Switching an
LED is a logical '1' switching it off is a logical '0'
A light sensitive device (photo detector)
receives the signal and coverts it back into
original data.

7. Actual Li-Fi Diagram
1/1/20

8. Real Time Usage of Li Fi

9. 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.

10. Electromagnetic Spectrum:

11. Applications
 Airlines
 Smarter Power Plants
 Undersea Awesomeness

12. Advantages of LI-FI
 Li-Fi can solve problems related to the insufficiency of radio
frequency bandwidth because this technology uses Visible light
spectrum that has still not been greatly utilized.
 High data transmission rates of up to 10Gbps can be achieved.
 Since light cannot penetrate walls, it provides privacy and security that
Wi-Fi cannot.
 Li-Fi has low maintenance costs.

13. Disadvantage
 Light can't pass through objects.
 A major challenge facing Li-Fi is how the receiving device will
transmit back to transmitter.
 Interferences from external light sources like sun, light, normal
bulbs.

14. Conclusion
 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.

15. 1/1/20

16. References:-
1. NEW EPOCH OF WIRELESS COMMUNICATION: LIGHT FIDELITY
ISSN/EISSN:23209798 23209801
Year.2013 Volume:1 Issue:2
2. IJCSMC, Vol.4, Issue 9, September 2015, pg. 113-124 Light-
Fidelity (Li-Fi): Transmission of Data through Light of Future
Technology
3. IOP Conf. Series: Materials Science and Engineering 325
(2018) The Technology of Li-Fi A Brief Introduction.

17. Thank You!...