1. GL
BAL
Institute of Information Technology

2. A Presentation on Li-Fi Technology
Group Members :-
Rahul Sisodiya
Ravikant Verma
Jugendra Singh

3. Contents : History.
 Introduction.
 What is Li-Fi ?

Drawback of before Li-Fi.

Why only VLC.

How Li-Fi works ?

Advantages.

Application Areas.

Conclusion.

4. HISTORY
The technology truly began during the 1990’s in countries like
Germany, Korea & Japan where they discovered LED’s could be
retrofitted to send information.
Li-Fi is a VLC (visible light communication) technology developed by a team
of scientists including Dr.Gordon Povey, Prof. Harald Haas and Dr.Mostafa
Afgani at the University of Edinburgh . The term Li-Fi was coined by Prof .
Haas when he amazed people by streaming high - definition video from a
standard LED lamp at TED Global in July 2011 . Li - Fi is now part of the
VLC PAN IEEE 802.15.7 standard. Li-Fi is typically implemented using
white LED light bulbs. These devices are normally used for illumination by
applying a constant current through the LED.

5. Introduction
In simple terms, Li-Fi can be thought of as a light-based Wi-Fi.
That is, it uses light instead of radio waves to transmit information.
And instead of Wi-Fi modems, Li-Fi would use transceiver-fitted
LED lamps that can light a room as well as transmit and receive
information. Since simple light bulbs are used , there can technically
be any number of access points.

6. WHAT IS LI-FI ?
Li-Fi is transmission of data through illumination, sending
data through a LED light bulb that varies in intensity
faster than human eye can follow.

7. DRAWBACK OF BEFORE LI-FI

8. WHY ONLY VLC
Radio Waves
Infrared Rays
Visible Rays
Ultraviolet Rays
X-Rays
Gama Rays

9. How Li-Fi Works?
Li-Fi is typically implemented using white LED light bulbs
at the downlink transmitter . These devices are normally
used for illumination only by applying a constant current.
However, by fast and subtle variations of the current , the
optical output can be made to vary at extremely high speeds.
The operational procedure is very simple, if the LED is on, you
transmit a digital 1, if it’s off you transmit a 0. The LEDs
can be switched on and off very quickly, which gives nice
opportunities for transmitting data.

12. ADVANTAGES

13. APPLICATIONS
Traffic
On
Lights.
Ocean Beds.
Public
Internet Hotspots.

14. 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.

15. Thank You !!
Any Query ?