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 fiber.

1. BY A.HARSHA VARDHAN
P.SAI CHARAN TEJA

2.  Present Usage of Communication
 Electromagnetic spectrum
 Introduction
 History
 Working principle
 Construction of LI-FI
 Applications of LI-FI
 Conclusion

3.  The Need of wireless data has been increasing day by
day in this modern world.
 The major source used for wireless
transmission is Radio spectrum.
 The problems of Radio spectrum are availability
,capacity , efficiency and security.

4.  The rays that constitute the electromagnetic spectrum
are:
 Radio waves
 Infrared waves
 Ultra-violet rays
 X-rays
 Gamma-rays
 Visible Light rays.

5.  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 fiber.
 Visible light communications (VLC) signals work by
switching bulbs on and off within nanoseconds,which is too
quickly to be noticed by the human eye.

6.  Professor Harald Haas, from the University of
Edinburgh in the UK, is widely recognized as the
original founder of Li-Fi.
 Research has been going in
Korea , Russia and other dev-
loping countries from 1990’s
but Hass made the world
wonder with his creation at
the 2011 TED GLOBAL TALK.

8.  The LI-FI construction requires four primary sub-
assemblies:
a)Bulb
b)RF power amplifier circuit(PA)
c)Printed circuit board(PCB)
d)Enclosure

10.  Traffic lights and Vehicle lights
 Air craft cabins
 In some areas in hospitals
 Ocean beds etc

11.  Li-Fi is still in its infancy and the possibilities are very
high in which this technology can be moulded and
explored further.
 If this technology improves every bulb can be used as a
data hotspot.
 With its magic of light , it can make our world a lot
more safer , greener , cleaner and moreover a brighter
place to live.