Light Fidelity(LI-FI )

BY A.HARSHA VARDHAN

P.SAI CHARAN TEJA

Present Usage of Communication

Electromagnetic spectrum

Introduction

History

Working principle

Construction of LI-FI

Applications of LI-FI

Conclusion

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.

The rays that constitute the electromagnetic spectrum

are:

Radio waves

Infrared waves

Ultra-violet rays

X-rays

Gamma-rays

Visible Light rays.

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.

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.

The LI-FI construction requires four primary sub-

assemblies:

a)Bulb

b)RF power amplifier circuit(PA)

c)Printed circuit board(PCB)

d)Enclosure

Traffic lights and Vehicle lights

Air craft cabins

In some areas in hospitals

Ocean beds etc

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.