Li fi

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Introduction

History

Working

Why VLC?

Li-Fi v/s Wi-Fi

Applications & Advantages of Li-Fi

Limitations

Conclusion

Contents

Li-Fi is a VLC (Visible

Light Communication)

Technology.

Li-Fi is transmission of

data through illumination,

sending data via LED light

bulb with incredibly fast

variation in intensity

which human eye can not

detect.

INTRO: WHAT IS LI-FI?

The technology truly began during the 1990's in countries like Germany, Korea, and Japan where they discovered LED's could be retrofitted to send information.

Harald Haas continues to vow the world with the potential to use light for communication.

HARALD HAAS

History

Continue….

Working process of Li-Fi

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Transmitting Element

LED

VENKY

Signals from the data input is modulated

to intensity of light.

Transmission side simply contains an

led lamp which transmits the modulated

light signals.

This led lamp contains a series of LED’s

which proto fits according to the input

given .

Receiving Element

(Detector)

Avalanche

Photo Diode

Image Sensor

VENKY

Receiving elements are

“AVALANCHE PHOTO

DIODE” and “IMAGE

SENSOR”.

Avalanche photo diode is

responsible for converting the

light signal into electrical signal

and further the procedure is

carried out by image sensor.

Gama rays can’t be used as they

could be dangerous.

X-rays have similar health issues.

Ultraviolet light is good for place

without people, but other wise

dangerous for the human body.

Infrared, due to eye safety

regulation, can only be used with

low power.

Why VLC ?

Li-Fi

Vs

Wi-Fi

Li-Fi can be thought of as a light-based Wi-Fi. That is, it

uses light instead of radio waves to transmit information.

Instead of Wi-Fi modems, Li-Fi would use transceiver-fitted

LED lamps that can light a room as well as transmit data.

receive information.

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Li-Fi Technology is still in its infancy. However some areas

where it seems perfectly applicable are :---

1- TRAFFIC CONTROL SYSTEM

Traffic lights can communicate to

the car and with each other. Cars

have LED-based headlights, LED-

based cack lights, and cars can

communicate with each other and

prevent accidents in by exchanging

information.

RF Restricted Nuclear Power Plants :

Visible Light is more safe than RF, hence it can be used in

places where RF can't be used such as petrochemical plants .

Airlines :

Whenever we travel through airways we face the problem in

communication media ,because the whole airways

communication are performed on the basis of radio waves. To

overcome this drawback on radio waves , li-fi is introduced.

On Ocean Beds :Li-Fi can even work underwater were Wi-Fi fails

completely, thereby throwing open endless opportunities for

military/navigation operations.

Hospitals(In Medical Equipments)

CT

SCANNER

Li-Fi Gadgets

The possibilities are numerous and can be explored further. If

this technology can be put into practical use , every bulb can

be used something like a Wi-Fi hotspots to transmit wireless

data.

Cleaner, Greener, Safer and Brighter future.