What is Li-Fi or Light Fidelity, and how does it work?

What is Li-Fi or Light Fidelity, and how does it work?


How are you all? I hope you are all much better and healthier. Today we will talk about Li-Fi. Many of you may not know about this technology, or many of you may not know the details about it. Today we will try to give you detailed information about Li-Fi or Light Fidelity through this article.

Although we have known about Li-Fi or Light Fidelity in many places, we may not have known how this technology works and why it is different from all other technologies. But this time, we will try to explain to you about this Li-Fi or Light Fidelity. Therefore, you must pay attention to the complete article to understand what it really is.

What is Li-Fi or Light Fidelity, and how does it work?

Simply put, Li-Fi is Light-based Wi-Fi. Wi-Fi technology transmits data using radio frequencies, in the same way, Li-Fi transmits data using lights. It's weird to hear that, but it's the technology. The point here is that the lights we use for lighting at home can also be used to transmit data using Li-Fi.

When you connect electricity to a light bulb in your home, it lights up instantly. Now, if we stop the transmission of electricity in that light, the light goes off. This is where the issue seems to be a prevalent one to us, where the bulb goes off if we turn off the electrical conduction of the light. But have we ever wondered what is going on behind the lights? Here, our answer would be that the bulb has stopped because of closing the transport of electricity in that bulb.

In the same way, if we think of all the data transmission on the Internet, what is the matter? Here we must know that waves are being used to transfer our information from one place to another. First, our data from our device is converted to the digital format as 0 and 1. Then these 0 and 1 go to our router in the form of waves. From there, we have that information going to its destination through the optical fiber at the speed of light. This is how our data is being transmitted on the Internet.

Li-Fi or Light Fidelity working process

All the data that we see in the digital world is stored everywhere as 0 and 1. And, all the information on our device comes from the internet as 0 and 1. We all know that in the digital world, everything depends on 0 and 1. Now suppose, if current does not flow through a bulb, then it will be 0, and when current flows through that bulb, it will be 1. This way, if a bulb is turned on and off very quickly, a data set of 0 and 1 is created.

And it is possible to run the internet like WiFi by receiving this dataset from the receiver. Now you may think that if the bulb in your house is turned on and off repeatedly like this, then it may be impossible to stay in your home. Let us tell you that if you have an AC bulb in your house, it blinks or keeps turning on and off almost 100 times a second while it is on. The amount of blinking depends on the frequency of the electricity we use in our house, which is 50 Hz.

You can't see the bulbs in your room turning on and off with the naked eye. But you may see it by turning on your mobile phone camera and holding it towards the bulb. However, in the case of Li-Fi or Light Fidelity, you will not understand the flickering or shaking of the bulb because it needs a lot of frequencies to send and receive data.

In this case, the connection that will come to your home will first go to a modem. Then from the modem, it will go into an LED driver and control the LED light in your home. From there, the signal will be converted into an electronic signal which your computer will receive. This is how your computer will get an internet connection. This is the general diagram of Li-Fi or Light Fidelity.

Why do we need Li-Fi despite having WiFi?

We are currently browsing much faster internet via WiFi. The WiFi speed is much higher than mobile data, and it can get the same amount of speed from anywhere in the world. Everyone from the city to the rural areas can run the internet at the same speed by using a WiFi connection. But the question now is why we will use this new technology, Li-Fi, despite the availability of high-speed internet. Let's take a look at some of the reasons for Li-Fi or Light Fidelity, excluding WiFi.

There are three reasons to use Li-Fi. One is that the amount of our data is increasing day by day. Also, not all of the devices we use are wired. And that's why all the devices we use need to be wireless. And third, the "Internet of Things."

Before we only used the internet on mobiles and computers. But now we use the internet in everything from our watches to our TVs. And a time will come in the future when the internet can also control our doors' locks. And for all this, we must have high-speed internet. The problem with our WiFi is that the speed of WiFi is much lower than Li-Fi.

Now suppose, if one or two devices are connected to the same WiFi in your home, you will not know whether the speed of your WiFi is high or low. This speed will seem normal to you. Now, if you go to a public place where everyone has access to the same Wi-Fi, you will realize that WiFi cannot serve you well among so many people. When the number of users increases, the speed decreases significantly. Not to mention, the security system of WiFi is not so good.

Speed difference between Li-Fi and WiFi

So, when we first heard about Li-Fi, it was said that through Li-Fi, much more data can be exchanged simultaneously with higher speed. It will be much faster and 100% secure. Since you have to be close to the light to use Li-Fi, it will have much more security than WiFi. Although it seems Li-Fi is much better than wifi, in reality, wifi is still better for us. As an example, when some Li-Fi devices first came out in 2016, it was seen that the speed of those devices was much lower. It was only 43 Mbps.

If we look at the WiFi speed of that year, 100 Mbps to 300 Mbps was available. However, at present, 1Gbps Li-Fi is also available. But they are much more expensive. So, It is not convenient to use Li-Fi even after so many benefits. Besides, if you want to use the internet through this technology, you must keep the lights on.

If you turn off the lights, the internet will not work anymore. Because the internet runs through Li-Fi only because of the light. Where the flickering of the light or turning on and off reveals the digital formate of the data. In this case, 0 is when the light is off, and 1 is when it is on.

There is a lot of hassle to use this technology because of the need to keep the lights on all the time to run the internet. That's why this technology is not much successful till today. The WiFi routers that used to be available back then were simplex. That means you can only send or only receive data. But now duplex routers are available, and through this, data can be both sent and received. So in the case of Wi-Fi, the problem of speed now is much less than before.


WiFi is still the best choice for our daily use as Li-Fi has some unsuitable downsides. But what is your opinion about Li-Fi? Will WiFi technology be the better choice for us, or will Li-Fi take over the place of WiFi? Let us know your opinion about Li-Fi technology in the comment section. We hope you enjoy the article. If you liked it, don't forget to share it with your friends. See you soon with a new post. Stay well, stay healthy. Goodbye.