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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
one Australian Astronomer invented this!
This came from a failed experiment they were conducting
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
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
if we compare light frequency from radio frequency
light is 10000 times better than radio
10000 times faster than radio communication
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
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
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
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
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
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
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This is your Prasad,signing of i’ll see you in the next video thanks for watching.Bye Bye now!!!!!!!!!!!!