Li-Fi is a wireless optical networking technology that uses LED lights for data transmission. It was invented by Professor Harald Haas and allows data to be transmitted by modulating the intensity of light from LED bulbs. Unlike Wi-Fi which uses radio waves, Li-Fi uses visible light and has a faster data transfer rate while avoiding interference. It provides more secure communication through walls and in dense environments like airplanes or undersea. However, Li-Fi also requires a constant light source and signal can be blocked by physical barriers.

1. LI-FIINTRODUCTION
• WHAT IS LI-FI?
LIFI IS A WIRELESS OPTICAL NETWORKING TECHNOLOGY THAT USES LIGHT-
EMITTING DIODES (LEDS) FOR DATA TRANSMISSION.

2. WHO INVENTED LI-FI?
Harald Haas
The term LiFi was coined by
pureLiFi’s CSO, Professor
Harald Haas, at a TedGlobal
Talk back in 2011 where he
demonstrated LiFi for the first
time.

3. HOW IT WORKS!
LiFi allows for data to be transmitted by
modulating the intensity of light, which is then
received by a photo-sensitive detector. The
light signal is then demodulated into
electronic form. This modulation is performed
in such a way that it is not perceptible to the
human eye.

4. DIFFERENCE BETWEEN LI-FI & WI-FI
LiFi WiFi
• Light Fidelity • Wireless Fidelity
• Uses light with the help of
LED bulbs.
• Uses radio waves with the
help of WiFi router.
• Do not have any interference
issues.
• Have interference issues
from nearby access points.
• Used in airlines, undersea
exploration,office and home.
• Used for internet browsing
with the help of Wi-Fi
hotspots.
• Coverage distance is about
10 meters.
• Coverage distance is about
32 meters.
• Light is blocked by walls and
hence provide more secure
data transfer.
• Signals can not be blocked
by walls.
• Works in high dense
environment.
• Works in less dense
environment.

5. ADVANTAGES
DISADVANTAGES
• Needs constant light source.
• Other sources of light may interfere with the signal.
• The signal's range is limited by physical barriers.
• The data transfer rate for internet application is
higher.
• It provides high amount of security.
• It uses optical spectrum and hence avoids already
crowded RF spectrum.
• it is very efficient.

6. LIGHT BECOMES DATA
Shnan M. & Peywand O.
University of Halabja/College of Computer Science

7. THANKS FOR WATCHING