PPt on LIFI ,Latest technology after wifi

2.  Light based WI-FI
 Light is used instead of radio-waves to transmit
information
 Transceiver fitted LED lamps acts like Wi-Fi modems
 LED lamps can light a room as well as transmit-receive
information
 Provides illumination as well as data communication

3.  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.

4.  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.
In October 2011, few companies and industries group formed
Li-Fi consortium to promote the high speed optical wireless
systems

5.  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.

6. 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.

8. 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

9.  LIFI can be used in
Sensitive areas such as aircrafts for data transmission
without causing interference
Traffic scenarios, thereby reducing accidents.
Underwater applications where radio waves cannot
propagate.
Industries like petrochemical plants, nuclear power plants
, petrol pumps etc

10. 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.

11.  Downloading notes from blogs of teachers
 Often it is necessary to download
lecture notes from the blogs of
respective teachers. With Li-Fi, the
download can be done in the hall
itself
 Interactive classroom with interconnected devices
 The classroom will be more
interactive with the real-time
interconnectivity between 500
devices

12. Used in RF restricted environments like chemical industries,
nuclear power plants, petrol pumps

13.  In home and small offices, Li-Fi can be used to communicate with devices
like
Laptops
Internet access
HD video streaming
Printer

14.  Harald has 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.

15.  Data rate greater than 10 Gbps; Theoretically allowing 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.

16.  Visible light cannot penetrate through solid objects.
 A major challenge of LiFi is how the receiving device will
transmit back 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 of LED source.

17. 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.