Presented By:

B.JAGADEESH

14A81A0565

Seminar On

Li-Fi Technology

ContentIntroductionHow Li-Fi Works?Real Time Usage of Li-Fi Comparison between Various TechnologiesHow it is different?Wi-Fi vs Li-FiApplicationAdvantagesDisadvantagesConclusion

Introduction

In simple terms Li-Fi can be thought as light based Wi-Fi.

Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission.

Li-Fi is designed to use LED light bulbs similar to those currently in use in many energy-conscious homes and offices.

Li-Fi data is transmitted by the LED bulbs and received by photodeceptors.

How its worksLi-Fi and Wi-Fi are quite similar as both

transmit data.However Wi-Fi uses radio waves while Li-Fi

uses of visible light.Data is fed into LED bulb ,it then sends data

at high speeds to the photo-detector.The signal is converted back into a binary

data stream that we would get as videos, audios and applications of internet enables devices.

How Li-Fi Works?

Usage of Li-Fi:• The LEDs can be switched on and off very

quickly which gives nice opportunity for data transfer in the form of Binary code.

• Switching ON an LED is logical ‘1’,switching of an LED is logical ‘0’.

• Hence it is possible to encode the data into the LED’s by using a controller ,we just have to vary at which LED’s .

• Flicker depending on the data we want to encode to give different strings of o’s and 1’s.

Real Time Usage of Li-Fi

How it is different?

Li-Fi technology is based on LEDs for the transfer of data.

The transfer of the data can be with the help of all kinds of light, no matter the part of the spectrum that they belong.

That is, the light can belong to the invisible, ultraviolet or the visible part of the spectrum.

Wi-Fi vs Li-Fi Li-Fi Wi-FiLi-fi transmit the data using LED bulbs

Wi-Fi transmit data using radio waves

Li-Fi is fast internet speed Wi-Fi is slow comparatively Li-Fi.

Data transfer speed is about 10gbps

Data transfer speed is about 150mbps

Coverage distance is about 10 meters

Coverage distance is about 32 meters ,vary based on transmit power and antenna

Device to device connectivity is high

Device to device connectivity is low

Applications1.Airlines Whenever we travel through airway we the face many problems in communication media, because the whole airway communication based on radio waves, to overcome this drawback on radio waves , li-fi is introduced.

2.Ocean beds: Li-Fi can even work under water Were Wi-Fi fails completely, there by throwing open endless opportunities for military and navigation operations.

Advantages of Li-Fi

High data transmission rates of up to 10Gbps can be achieved.

Since light cannot penetrate walls, it provides privacy and security that Wi-Fi cannot.

Li-Fi has low implementation and maintenance costs.

Wi-Fi transmit data through radio waves that causes health diseases. Li-Fi uses Light sources.

DisadvantageLight can't pass through objects. A major challenge facing Li-Fi is how the

receiving device will transmit back to transmitter.

High installation cost of the VLC systems.

Conclusion

The possibilities are numerous and can be explored further.

If his technology can be put into practical use,

every bulb can be used something like a Wi-Fi hotspot to transmit wireless data and we will proceed toward the cleaner, greener, safer and brighter future.

Thank you