This is the best presentation i am providing to all the students, professionals and others. It will give you all a clear picture about what actually this Li-Fi technology is. This is also a easy guide to the students who are taking presentations or seminar based on this topic. LiFi is the next generation epic technology that would totally change the world to a new era which is fully occupied with the light as source for everything..........I REPEAT LIGHT AS SOURCE FOR EVERYTHING

2. LIGHT FIDELITY (Li-Fi)
 Light based Wi-Fi.
 Light is used instead of radio waves to transmit information.
 Transceiver fitted LEDs lamp acts like Wi-Fi Modems.
LED lamp can light a room as well as transmit and receive
information.
 Provides illumination as well as data communication.

3. NEED FOR LI-FI
 Radio spectrum is congested, but the
need for wireless data doubles each year.
 Issues regarding radio spectrum, such as
capacity, availability, efficiency, security
are solved using Li-Fi.
 Speed of data transmission can be
increased.
10 MILLION

4. OVERCOMING Wi-Fi ISSUES
 CAPACITY
 Spectrum is 10,000 times greater than that of radio frequency.
EFFICIENCY
 Highly efficient since LED consumes less energy.
 AVAILABILITY
 Light waves available everywhere.
 SECURITY
 Cannot penetrate through walls. Hence data cannot be intercepted.

5. VISIBLE LIGHT COMMUNICATION
 In electromagnetic spectrum, gamma, UV rays, are dangerous
for human body.
 IR rays, due to eye safety regulations, are not used.

6. HARALD HAAS

7. LIFE IF LI-FI
 Introduced by professor Herald Hass, at the university of
Edinburgh.
 Established in 2011 TED global talk.
 The promotion of idea through TED helped to start a
company.
 Pure LiFi, formerly pure VLC, is an original equipment
manufacture firm setup to commercialize LiFi products for
integration with existing LED lightning systems.
 In October 2011, few companies and industries group
formed LiFi consortium to promote the high speed optical
wireless systems.

8. A PROVEN TECHNOLOGY
 Harald Haas demonstrated Li-Fi
using an ordinary table lamp and a
computer located below the lamp.
 He successfully transmitted data
at speed exceeding 10Mbps using
light waves from LED light bulbs .
 Also he periodically blocked the
beam of light, causing the
connection to drop.

9. HOW IT WORKS ?
 Operational procedure is very simple.
 If LED is ON, digital data ‘1’ is transmitted & if LED is OFF, digital
data ‘0’ is transmitted.
 LEDs varies in intensity so fast that a human eye cannot detect it.
A controller connected at the back side of these LEDs is used to code
data.
 Also called as 5G Optical Communication.

10. IMPLEMENTATION
 All the data from Internet is
streamed into lamp driver.
 Data from internet is used to
modulate the intensity of LED
light source.
 Thus by fast and subtle
variations of current, optical
output can be made to vary at
extremely high speed
 The photodetector picks up the
signal
 The receiver dongle then
converts the tiny changes in
amplitude into a data stream.

12. LI-FI NETWROKS
 Li-Fi connector and router are the main
components for a network
 Room connector:
 Optical signals cannot penetrate through
walls, in order to provide an optical
WLAN, rooms need to be connected
with each other
 Li-Fi room connector is a replicator,
which sends the data stream from one
side of the wall to the other side via an
optical fiber.
 For smaller rooms, connector act as the
only Li-Fi hotspot in the room

13. LI-FI ROUTER
 Serves as a connector to external
link like DSL.
 Covers a radius of about 20 meters
 The transmission speed is 100 Mbps.
 Suitable for small office or home use

14. APPLICATIONS
 LIFI can be used in -
 sensitive areas such as aircrafts for data transmission without
causing interference
 Places where it is difficult to lay optical fibers like operation
theaters
 Traffic scenarios, thereby reducing accidents
 Underwater applications where radio waves cannot propagate.
 Industries like petrochemical plants, nuclear power plants,
petrol pumps etc

15.  In traffic scenario, LIFI can be used to
communicate with the LED lights of cars .
 Cars can have LED-based headlights,
backlights and can communicate with each
other.
 This might prevent accidents, by
exchanging information, when the vehicles
are too close
 Using LIFI, Street lights can be used to
send information about the road condition
to the car.
TRAFFIC SCENARIO

16. INDUSTRIES
Used in RF restricted environments like chemical industries ,
nuclear power plant , petrol pumps

17. HOME AND SMALL OFFICE
 In home and small offices, Li-Fi can be used to communicate with
devices like
Laptops
Internet access
HD video streaming
Printer

18. AIRCRAFTS
 The whole airways communication are performed on the basis of
radio waves.
 Hence passengers face the problem in communication media.
 This problem can be overcome by using LiFi , since Light waves
will not interfere with radio waves.

19. VLC SMARTPHONES
 The first VLC Smartphone was
presented by Consumer Electronics
in January, 2014
 The phone uses Wysips connect – a
clear thin layer of crystal glass is
added to the small screens
 Smartphone makes them solar
powered.
 Smartphone could get 15% more
battery life in a day
 Can communicate using Li-Fi.

20. ADVANTAGES
Data rate greater than 10 Gbps; Theoretically allowing 10 HD film
to be downloaded in 30 seconds
 Can be used anywhere, even in RF restricted areas; Since light
waves will not interfere with radio waves.
 Mostly LED light bulbs are used, which consumes less energy.
Hence cost efficient.
 As light waves cannot penetrate through walls, the data cannot
be intercepted; Thus provides secured communication.
 Efficient alternative to radio based wireless; since it is quick
and reliable.

21. LIMITATIONS
 Visible light cannot penetrate through solid objects.
 A major challenge of LiFi is how the receiving device will transmit ba
to transmitter.
 Interferences from external light sources like sunlight, in the
path of transmission will cause interruption in the communication.
 Data transmission can be easily blocked by any object placed in front
LED source.

22. CONCLUSION
Thus, if Li-Fi technology can be put into practical use, every
bulb can be used as an alternative to Wi-Fi hotspots. It provides
simple, faster and efficient wireless data communication. Li-Fi
will make us to proceed towards the cleaner, greener, safer and
brighter future.
Thus, if Li-Fi technology can
be put into practical use, every
bulb can be used as an
alternative to Wi-Fi hotspots. It
provides simple, faster and
efficient wireless data
communication. Li-Fi will
make us to proceed towards the
cleaner, greener, safer and
brighter future.
CONCLUSION