What is Li-Fi technology and How Li-Fi Technology works

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 Li-Fi Technology:


What is Li-Fi technology and How Li-Fi Technology works
What is Li-Fi technology 



In this article, we will learn about Li-Fi technology. Which is the abbreviation of the term Light Fidelity?


What is a Li-Fi Technology:


So, in simple terms, we can say that this Li-Fi technology is nothing but light-based wi-fi technology. And as we know, this Wi-Fi is fully networked, bi-directional wireless communication technology. Where data is being transmitted using radio waves.


While in the case of Li-Fi technology, the data is transmitted in the form of visible light using the LED light source. So, these household LED bulbs and LED lamps which are used as the light source can also be used to transmit the data.


So, first of all, let’s understand how this Li-Fi technology works.


Also Checkout: What is a TCP


Li-Fi Full form:


The full form of Li-Fi is light fidelity.


How Li-Fi technology works:


If you see any LED light source, if you provide the constant current to this LED bulb, it provides the constant illumination or constant brightness. So, as we change the current that is flowing through the LED bulb, the illumination or brightness of this bulb will change.


So, this principle is used for transmitting the data wirelessly using this Li-Fi technology. So, if no current or minimum current is flowing through this LED bulb then, the brightness of this LED source will be minimum. And that will be treated as digital 0, Then digital 0 will be transmitted at the receiver side.


Similarly, when the light bulb is ON, or we can say that if the maximum amount of current is flowing through this LED bulb then the illumination or brightness of the LED bulb will be maximum. And that will be treated as digital 1.


So, whenever the LED is ON, so digital 1 will be transmitted at the receiver side. So, in this way, by flickering the LED light source very rapidly we can transmit the data in the form of 1’s and 0’s to the receiver.


And if this flickering is happening a million times per second then we can not see this flickering with our naked eyes. And we can treat this LED bulb source as a normal regular bulb source.


Now let’s see the schematic of the Li-Fi transmitter and receiver system. So, as you can see, the data which is coming from the webserver or the internet first will go to the MODEM, which provides the necessary modulation to the incoming data stream.


Then this modulated data is fed to the LED driver, which changes the driving current for this LED bulb according to the incoming streaming data.


At the receiver end, if you see, the optically received data is first converted into the electrical signal using the photoreceiver photodiode. And after the signal conditioning, this data is fed to the computer or laptop.


To receive this incoming data, at the receiver side we require the Li-Fi dongle, which consists of a photoreceiver as well as an IR transmitter. Now this infrared transmitter can be used to transmit the uplink data back to the LED source.


Which generally makes these Li-Fi dongles. So, now as we know, how this Li-Fi technology works,


Now let’s see the advantages/application of this Li-Fi technology over the other wireless communication technologies.


Application of Li-Fi technology:


So, these are some of the advantages of the Li-Fi technology over the other wireless communication technologies.


So, first, let’s talk about speed. So far the researchers have achieved the speed up to 10 Gbps in the lab-scale prototype models. And this speed can further be enhanced by using the array of LED sources or by using the multiple colors of LEDs like RGB LEDs,


where each LED source can transmit the data up to 10 Gbps. So, using such technologies, the researchers have achieved a maximum speed of up to 100 Gbps.


Now let’s compare its speed with other wireless communication technologies. So, if we compare it with 4G/LTE or particularly the LET advanced, the maximum achievable speed under this LTE advanced is 1 Gbps for the stationary user and 100 Mbps for the mobile user.


But all these speeds are the theoretically achievable maximum speed. But actual speed may be much lesser compared to this theoretically achievable maximum speed.


So, if you see the countries which provide the fastest internet in the world, the average 4G/LTE speed in such countries is in the range of 40-50 Mbps, which is much lesser compared to the speed which is provided by the Li-Fi. So,


Now let’s compare the speed of Li-Fi with Wi-Fi. Now, in the case of Wi-Fi, if you see the standard IEEE 802.11.ac, the maximum speed which can be supported by this standard is 1.3 Gbps. And that is in the 5 GHz band, which is almost 100 times lesser compared to the speed which is supported by the Li-Fi.


Now let’s talk about the difference between Li-Fi and Wi-Fi.


Li-Fi vs Wi-Fi:


Wi-Fi

Li-Fi

Data transmission in wifi is through wireless and radio waves.

 

Data transmission in Li-Fi is given with the help of light.

 

Wifi can be accessed from the wifi router device.

 

Li-Fi is accessed with the help of an LED Bulb.

 

WLAN 802.11a/b/g/n/ac/ad Standard Compliant Devices.

Technology Present IrDA Compliant Devices.

 

Internet access is done only by having a WiFi hotspot.

The office in the Operation Theaters of Airlines Undersea Exploration Hospitals and where the light can reach.

 

Data Transfer High Speed ​​Up to 1Gbps.

 

 

Data Transfer High Speed ​​Up to 100Gbps.

 

 

So I hope you will be understood what is Li-Fi technology and How Li-Fi technology works and its application.


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