PPT on life fidelity

1. Light Fidelity (Li-Fi)

3. Introduction
 What is Li-Fi?
 Li-Fi or light fidelity, is 5G visible light
communication systems using light from light-
emitting diodes (LEDs) as a medium to deliver
networked, mobile, high speed communication
in a similar manner as Wi-Fi and optical fibre.

4. History
 Professor Harald Haas from the University of
Edinburgh in the UK, is widely recognised as
the original founder of Li-Fi.
 Research has been going on in all the
developed countries from 1990, but Mr Harald
has stunned the world when he presented on
Li-Fi during Global Talk 2011.

5. Working
 There is a light emitter on one end and a photo
detector on the other. The data input to the LED
transmitter is encoded in to the light by varying
the flickering rate at which the LEDs flicker ‘on’
and ‘off’ to generate different strings of 1s and
0s.
 Switching ON a LED is ‘1’, switching OFF a
LED ‘0’. By varying the rate at which the LEDs
flicker on and off, information can be encoded in
the light to different combinations of 1s and 0s.

6. Li-Fi Transmission

7. Why Li-Fi?
 Easily availability and less harmful than other.
 Radio waves are expensive, Gamma rays are
harmful and X-rays having health issues.
Ultraviolet light are dangerous for human if used
continuously.
 Visible light cause no harm to people.
 Wi-Fi use radio wave while Li-Fi utilise light
waves and has no interference issues and is
very faster.

8. Applications
 There are numerous applications of Li-FI
technology, from public internet access through
LEDs to autopilot cars that communicate
through their headlights (LED based). It can
also used in areas like aircrafts and hospitals,
power plants and various other areas.

9. Future applications
 Li-Fi can also used in future.
 Some applications of Li-Fi could be as follows: a)
Education system- for fastest internet speed. b) Medical
applications- Li-Fi can prefer over Wi-Fi due to radiations.
c) Cheaper internet in air crafts. d)
Underwater applications- locating the objects. e) Disaster
management- means of communication in earthquakes or
hurricanes. f) Application in sensitive
areas like power plants.

10. Limitations
 Internet can't be access without light source.
 It requires an near or perfect line-of-sight to
transfer data.
 Opaque obstacle or pathways can affect data
transmission.
 Normal light, sunlight and normal electric light
can affect the data transmission speed.
 Light waves don't penetrate through walls.

11. Conclusion
 The possibilities are numerous. if this
technology can be put into practical use, every
bulb can be used something like a Wi-Fi
hotspots to transmit wireless data.

12. THANK YOU