This document presents an overview of Li-Fi technology. It discusses the history of Li-Fi, which began in the 1990s using LED lights to transmit data. Li-Fi was later developed by a team including Dr. Gordon Povey and Prof. Harald Haas at the University of Edinburgh. Li-Fi uses visible light communication (VLC) through white LED light bulbs to transmit data at extremely high speeds by varying the light intensity faster than the human eye can detect. The document outlines how Li-Fi works and its advantages over traditional Wi-Fi. It also discusses potential application areas for Li-Fi technology, such as in traffic lights, underwater, and public internet hotspots.

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 ?