Ted Talk:
cnet:
Other sources:

…

my video gear

my prime lens

my mics
boya m1

blue yeti mic

my tripod

follow me

intromusic credits
song name :DEAF KEV – Invincible [NCS Release]

artist credits:
▽ Follow DEAF KEV
SoundCloud
Facebook
YouTube

Hi,Everyone My name is Prasad and you are watching Prasadtechintelugu

Friends!… Wifi ! you might have heared this word already we are using right now

Lifi ! I think you might heared about this word too!

So,Many of you Think that

Lifi will work 100% faster than Wifi

And it is better than wifi

So,many of you don’t know how Lifi works

First of all Wi-Fi means Wireless Fidelity and Li-Fi means

Light Fidelity. so,why Lifi will work faster than wifi?

How can we communicate using light?

Today i gonna explain you about this.

So,stay tuned my name is Prasad keep watching Prasadtechintelugu!

Friends,First of all wifi means Wireless Fidelity

In 1992

one Australian Astronomer invented this!

This came from a failed experiment they were conducting

experiment on

Explosion of Black holes

But the experiment had failed!

and they invented wifi. They are John O’Sullivan and his

colleagues.They all together condected the experiment

and wifi came into existance
so,we were using this

WiFi for different purposes and

we cannot live without it!!

wireless communication is useful in many ways!

Now LIfi have arrived.Lifi was introduced by Harald Haas in 2011

He gave the demo of this in 2011

He proposed that we can use light for communication.

Light is the

Part of electromagnetic wave!

Electromagnetic spectrum looks like something like this!

communications like Wifi

or mobile communicaton

Microwaves or Bluetooth

Everything here will have Range upto

300GHz

We call this as radio frequency waves

Above mentioned communication methods uses this

Radio frequency waves for communication

Signals from the cell tower uses radio frequency and Bluetooth signals also uses radio waves

signals from the wifi also uses radio frequency waves

We call this waves as RF waves

so, these all will be below 300GHz and not above 300GHz

these speed will not be high enough

If we consider light,light will have nearly

800THz of frequency

that means

if we compare light frequency from radio frequency

light is 10000 times better than radio

10000 times faster than radio communication

so,this

is what he is proposing.We can also use light for the communication

And he gave a demo for this in the year 2011

In his demo he streamed a video

He showed.By streaming a HD video

He was using light for doing this

Light will flicker when we on the light source

It will flicker about a thousand times

That means it will continuously on and off

we cannot see it with our naked eyes but we can feel it going on and off continuously

but it will flicker for several times per one second.And it is a LED bulb

He performed this by using LED bulbs

They used this flickering for the data transfer and communication

But data transfer will be in binary code

01100110 something like that

So,that’s how data will be transferred. For example

when you on a T.V and operating it with your remote control

so,between your remote and T.V

infrared, IR blaster

Infrared waves will be working on binary language

0110 like that data will be transferred by means of binary code

from remote to T.V

so, the channel can be changed

It is only single data stream here you can see

when you consider light it has multiple data stream and all are parallel

We can see here data stream will be much more faster

in light wave communication!!

Lifi will not work with radio frequencies

it will work using infrared waves like remote control

If we look briefly into the demonstration

they’ve given a connector to the light

and ethernet cable is connected to it

and it is attached to the sealing of the room

Light and the connector both fixed to the sealing

and they both are connected

Now what ever the data were are streaming from the internet

For example if i wan’t to open a website from the internet

First the information will be sent to light

Light will flicker for several thousand times

and the binary code will be in that

this binary information will be converted to digital output

this is done by

the receiver in the bottom

the job of the receiver is to convert the

binary information into digital output

and the

receiver will be connected to the system

by means of USB cable

so, what ever we are browsing in the computer

information will be displayed on the monitor,like video

or website

Interference for the Information,like other light interfering the Information coming from the source

or the sun is interfering the source

And this problem was also solved.

they manufactured a receiver

which will only digitize the information coming from the flickering source

For example,when i opened a website

Light source which is flickering

will be digitized

and will eliminate all the unwanted light from the surroundings

If I kept two lights left and right,it will ignore these light

it will digitize only the information coming from the source

which was transferring data and flickering

It was made in 2014 or 2015

2014 sorry! Demonstrated in MWC

It is still under Demonstration stage

They want to make a chip which can be inserted in mobiles

we can use LIfi in mobiles

Still they didn’t started making this chip!

At present we can use LIfi only by connecting USB to computer

system and laptop’s

In mobiles for Wifi connectivity there will be antenna

for receiving wifi signals

Similarly,

If we want to use Lifi in our mobiles there should be some chip for that

then we can use Lifi in our mobiles

So, this is the total information about Lifi

Why Lifi didn’t came into limelight and why we couldn’t able to use LIfi?

Main reason is Lifi will use only light

as the energy source.

If we turn off the light we cannot able to access

the internet

So,light should be turned always on!

Dim light can also be used for the Lifi connectivity!

data will be transferred

It runs even in low light

But light should be kept turned on

Next point Friends light cannot travel

to other rooms it can’t get through the walls!

But if we consider Wifi it can get through the walls

of the room.It consists some Range

For example,I can use the Wifi from this room to

and Other room too! Wifi will connect even in other room

But Lifi won’t connect we should sit under the light

So,In this way Lifi has some disadvantages

They are trying to solve all these problems.

If I keep light above me,I can able to access it only here itself

I can’t use it if go to other room or some where

Otherwise we should have whole ceiling covered by LED bulbs

and they should contain transmitter compulsory

Data should go to the lights

receivers below the light will transmit the data

This whole process is risky,friends!

The whole ceiling should have LED bulbs

Even when we move the Lifi should switch from one light to another light

All the information should come to the mobile devices or computer what ever it may be!

So,it is still under development stage

They are still demonstrating about Lifi!

But light so cheap

when it compared to Wifi

To can be used directly in households

or offices.In South Korea some offices are using

Lifi in their offices.Speed will be excellent friends !

there will be no interference and if we consider radio frequency

one will get faster internet than other

but Lifi will be different

speed will be more when it is compare with Wifi

Speed will way too fast

for Lifi,it is 100 times faster than Wifi

so,that’s all about Lifi and it’s complete information for you about Wifi and Lifi

we are still using wifi

LIfi is still under developing state

If it completely develops surely Lifi will be a best option

Security will be more friends!

If we were doing something in this room data will not be transmitted to other room

because light cannot get through the walls

and radio frequency waves can be transmitted through the walls

So,

security will be more in Lifi than in Wifi

So,this is friends overall difference between Wifi and Lifi

friends today is Q&A section

I will be Live between 8:00 to 8:30

definitely you should participate in that live and ask your queries

on live I will give my

best to answer the queries

Friends,I think I’ve given all the information

about Lifi and Wifi if you like the video press the like button below

for more videos like this you’ll see our channel logo

click on that and subscribe our channel

because i’ll give you all the information about technology

This is your Prasad,signing of i’ll see you in the next video thanks for watching.Bye Bye now!!!!!!!!!!!!