Li-Fi light fidelity is an outcome of twenty first century research. It is a 5G visible light communication system that uses light from light-emitting diodes (LED's) as a medium to deliver networked, mobile, high-speed communication in a similar manner as Wi-Fi.

1. Robin Singh

2. Li-Fi basically known as ―light fidelity is an outcome of twenty
first century research. It is a 5G visible light communication
system that uses light from light-emitting diodes (LEDs) as a
medium to deliver networked, mobile, high-speed communication
in a similar manner as Wi-Fi.
Li-Fi

3. LI-FI
Introduction
Founder of LI-FI
Present Scenario
Li-Fi Work
Transmitting Elements
Receiving elements
Real time usages
How it is different
Disadvantages of other spectrum`s
Wi-Fi Vs. Li-Fi
Comparison between various technologies
Advantages of LI-FI
Disadvantages of LI-FI

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

5. Founder Of LI-FI

6. Present Scenario
1.4
millions +
6.8
billion +

9. Transmitting Elements
LED
Fluorescent
Lamp
LED

10. Receiving Elements
Photo Diode Image Sensor

12. Real Time Usages

13. • 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

14. Why Only VlC??
 Gamma rays cannot be used as they
can be dangerous.
 X-Rays have similar health issues.
 Ultra-violet rays are good for places
without people, otherwise dangerous
for human beings.
 Infrared due to eye safety regulation
should be used with low power.
 Visible light on the other hand is
everywhere, and also has a wide
spectrum.

15. Insufficient
spectrum
for
increasing
data
Low power
application
Which is
not used
so far.
Dangerous
for human
body
Used for
hospitals
It is not
used
generally
Electromagnetic Spectrum
Radio-
Waves
Infra-
red
Visible Ultra-
violet
X-rays Gamma
rays

16. Li-Fi Wi-Fi
Speed 1 – 3.5 GBPS 54-250 Mbps
Range 10 Meters 20-100 meters
IEEE Standard 802.15.7 802.11b
Spectrum Range 10000 times than WI-FI Radio spectrum range
Network Topology Point-to-Point Point-to-Multi Point
Data Transfer
Medium
Use Light As A Carrier Use radio spectrum
Frequency Band 100 times of THz 2.4 GHz

17. Wi-Fi 150 Mbps *
Bluetooth 3 Mbps *
IrDA 4 Mbps ***
Wired
Wireless(Current)
Wireless(Future)
Fire wire 800 Mbps *****
USB 3.0 5 Gbps *****
Thunderbolt 2*10 = 20 Gbps *****
Li-Fi 3.5 Gbps ****
Giga-IR 1 Gbps ***
Wi-Gig 2Gbps **

18. • Capacity
• Availability
• Efficiency
• High Security
• Easy To Use
• Fast Data Transfer
• Harmlessness
• Low-Cost
Advantages

19. Disadvantages
• Light can't pass through objects.
• A major challenge facing Li-Fi
is how the receiving device will
transmit back to transmitter.
• High installation cost of the
VLC systems.
• Interferences from external light
sources like sun, light, normal
bulbs, opaque materials.

20. For my Dear
Friends
And also For
Your
Precious Time