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.
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.
11.
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