Li fi ppt

Contents

History of networks

Present scenario

Invention of Li Fi

Introduction

Components of Li Fi

Working of Li Fi

Architecture of Li Fi

Properties

Issues with radio waves

Li Fi Vs Wi Fi

Advantages

Disadvantages

Application

Conclusion

Reference

History of Networks

In the olden days, people formed a network in order to transmit a piece of data from one place to another.

With the advances in technology a new mode of networking was developed by using the wires as a medium (wired networking).

As time passed the technology increased and we launched satellites into space and thus were in a position to transmit enormous amounts of data across various geographical locations.

Wireless networking gained a wide recognition and became the most popular type of all networks .

Present scenario

At present we have as many as 1.5 million

radio wave base stations across the globe.

We also have close to 5 billion mobile

connections which transmit a data over

600TB.

This penetration of mobile devices into our

lives has lead to a wide recognition of

WIFI technology.

Continued..

At present the data transmission across the

globe is being done using radio wave range

of the electromagnetic spectrum.

Whether we are using a wireless internet in

a coffee shop or mall, competing for

bandwidth at a conference or probably

stealing it from the guy next door.

We often get frustrated because of the low

speeds.

Continued..

Also as more and more devices get connected

to the network, clogged airwaves are going to

make it.

Invention of lifi

A German physicist, Harald Haas has

started working on transmission

of data using visible light back in

2004.

In the year 2011 he first

introduced to the world this new technology,

LI FI in the TED talk show.

He envisions a future where data for laptops and other mobile devices is transmitted through a light in a room.

Introduction to LI FI

Li-Fi (light fidelity) is a wireless technology

that uses light emitting diodes for

transmission of data.

It sends data through a LED light bulb that

varies in intensity faster than the human eye

can notice.

It is the optical version of Wi-Fi.

It uses light instead of radio waves to

transmit information.

Continued..

Light has been around for millions of

years now and is a very cheap resource

unlike radio waves.

Components of LiFi

A high bright white LED, which acts as

communication source.

A silicon photodiode, which shows good

response to visible wavelength region

serving as receiving element.

Working of LiFi

Li-Fi is implemented using white LED bulbs

at the transmitter.

The operational is: if the LED is on a digital

1 is transmitted, if the LED is off then a

digital 0 is transmitted.

They can be switched on and off in order to

transmit data continuously.

Architecture of LI FI

Continued..

On one end all the data on the internet will

be streamed to a lamp driver.

When the LED is turned on the microchip

converts this digital data in the form of light.

On the other end this light is detected by

photo sensitive devices.

Next this light is amplified and processed

and then fed to the device.

Properties

Fast and subtle variation of light can also

transmit data with high speed.

Any LED light set if used along with a

microchip inside it can used to detect the

variation in the light.

Thus it helps in converting light into data in

its digital form.

This is like sending a Morse code signal

using a torch but at a very fast speed.

Continued..

The very high speed blinking of the light

enables the source to transmit data in a rapid

stream of binary code that, although

invisible to the naked eye, can be detected

by a light sensitive device.

Thus every light emitting source can be

used as a hub for data transmission.

Issues with radio waves

CAPACITY:

The current system makes use of radio

waves.

With the increasing number of mobile

connections the availability of the spectrum

is getting congested.

Radio waves forms only a small fraction of

the entire EM spectrum thus making the

problem even worse.

Continued..

EFFICIENCY:

The current system is high on energy

consumption.

For every unit of energy consumed the data

transmitted is relatively less.

The data speeds in the current system can

only reach up to a few hundreds of megabits

per second.

Continued..

AVAILABILITY:

The availability of the radio waves is yet

another major issue now a days.

These waves are not much available during

the flight travel.

It is not advisable to use these devices to

places like petrol bunks.

Continued..

SECURITY:

These radio waves can easily penetrate

through the walls, thus letting anonymous

users to use the network.

This can pose threat if the people with bad

intentions start using it.

Li-Fi Vs Wi-Fi

Li-Fi

Data density is high

Uses visible light wave portion of EM spectrum.

Cheap

High data transfer rate over 1GB

Wi-Fi

Data density is low

Uses radio wave

portion of EM spectrum.

Expensive

It has a data transfer rate of maximum 54Mbps

Advantages of LiFi

Higher speed than WiFi.

More secure as data cannot be intercepted without a clear line of sight.

It has10,000 times wider bandwidth.

Availability is not an issue as light is present everywhere.

It consumes less energy and highly efficient.

It can be used in the environments like hospital, aircrafts.

Disadvantages

Presence of light is essential.

Works better with fluorescent light and

LEDs but very low efficiency with bulbs.

Applications

Some of the applications of Li-Fi are givenbelow:

Airways

Green information technology

Free from frequency bandwidth problem

Increase communication safety

Multi user communication

Lightings points used as hotspot

Smarter power plants

Under sea Awesomeness

Conclusion

This may solve issues like shortage of radio

frequency bandwidth.

It will allows internet where traditional radio

based wireless isn’t allowed.

LI FI will make are lives more technology

driven in the near future.

With its magic of light it can make our world a

greener, safer, cleaner and moreover a brighter

place to live.

References

http://www.technewspaper.net/best-five-

benefits-of-li-fi-technology/

http://www.youtube.com/watch?v=gjqSgsKbag

Qs

http://en.wikipedia.org/wiki/Li-Fi

http://www.ripublication.com/irph/ijict_spl/ijict

v4n16spl_11.pdf

http://journal.rtmonline.in/vol21iss1/05297.pdf