Have you ever cursed lagging Wi-fi in your location? Have you ever wanted to enjoy the streaming of your favourite show without any buffer? Not 4G, not 5G(yet to be introduced in India), I am talking about a different type of Wifi, which will transmit data at a lightning fast speed(and I mean it).

What is Li-fi?

Li-Fi stands for Light Fidelity and is a Visible Light Communications (VLC) system which uses wireless communications that travel at very high speeds , at the speed of light.

The term was first introduced by Harald Haas during a 2011 TED Global talk in Edinburgh.

Harlad Hass at 2011 TED Global talk on Li-Fi

Subsequently, in 2012 after four years of research, Haas set up company pureLiFi with the aim ‘to be the world leader in Visible Light Communications technology’.

Li-fi Vs Wi-fi

Wi-Fi vs Li-Fi

Li-Fi signals cannot pass through walls, so in order to enjoy full connectivity, capable LED bulbs will need to be placed throughout the home.

Speed Comparison

Not to mention, Li-Fi requires the light bulb is on at all times to provide connectivity, meaning that the lights will need to be on during the day.

Benefits of Li-fi

1 . High transmission speed

High Transmission Speed of Li-Fi

It offers a high data transmission speed at the speed of light.

Light is the fastest thing present in this world and one cannot exceed that limit.

Hence we are transmitting data at the highest possible transmission speed possible. Great, isn’t it?

2 . Security

Security in Li-Fi

Li-fi signals cannot penetrate walls hence preventing eavesdropping of your data by criminals.

It can only transmit in the places where light from the Li-fi router can reach. Hence all the persons have to be in the line of sight of the router.

3. No radiation


Light does not produce any type of radiation.

This reduces the damage caused by the radio wave’s radiation of Wi-fi.

Although it’s very little , still over long period of time it becomes significant).

We will be less prone to disease caused by harmful radiations. So Li-fi is health saviour too!!!

4. Data transmission underwater

Underwater data transmission

Radio signals generally fade after a short distance.

This makes it unusable for underwater data transmission. But Li-fi has the solution to this problem also.

We can transmit data underwater over Li-fi without the risk of fading out of signal.

5. Cost effective

It does not require any infrastructure to be set up or let’s say minimal setup.

Li-Fi enabled Lighting

The bulbs in our houses ….Yes, I am talking about the bulbs present in your room can double up as a transmitter for Li-fi signals and solar panels as a receiver.

Bulb as Li-Fi signal transmitter

6. Greater Data Density

Greater Data Density in Li-Fi

Li-Fi can achieve approximately 1000 times the data density of Wi-Fi.

It hence offers more data per square metre.

This means we can share 1000 times more data on Li-fi than we could do on Wi-fi. Now you can download multiple large files together in a go. Cool, isn’t it?

7. Advanced Lighting

Advanced Lighting of Li-Fi enabled lighting system

Any private or public lighting including street lamps can be used to provide LiFi hotspots.

The same communications infrastructure can be used to monitor and control lighting and data.

8. Location services

Location services with Li-Fi

LiFi systems are fully networked, and each LiFi enabled light has it a unique IP address.

This means that advanced geofencing can be deployed simply in a LiFi network.

Working of Li-fi

Working of Li-Fi

Li-Fi Internet Architecture

LiFi is high speed bi-directional networked and mobile communication of data using light.

LiFi comprises of multiple light bulbs that form a wireless network.

In terms of use it is similar to that of your Wi-fi. The key difference between Li-fi and Wi-fi is that , Wi-fi used radio frequency to transmit data but Li-fi transmits data using light .

Setup to demonstrate working of Li-Fi

Step 1

When a constant current is applied to an LED light bulb, a constant stream of photons are emitted from the bulb which is seen as illumination. For transmission of data it uses modulation of the intensity of light.

Li-Fi enabled Dongle

Step 2

Modulated light is then received by a peans the current, and therefore the illumination can be modulated at extremely high speeds which can be detected by the photo-detector.

Step 3

Transmission of Li-Fi signal in a room

The light signal is then demodulated into electronic form. This modulation is performed in such a way that it is not perceptible to the human eye. Using this technique allows for high-speed information can be transmitted from an LED light bulb.

For better understanding refer to the picture below

Figure depicting Li-Fi architecture

Applications of Li-Fi in the world

Applications of Li-Fi

1 .Advanced lighting

Advanced Street Lights

Almost every lighting system we have being using until now can be used as transmitter for Li-Fi enabling setup an easy task. Rather than other conventional methods of data transmission which requires a router — receiver setup, we could easily work with existing receivers in our phones coupled with lighting system(advanced systems )

2. Security

Security of Li-Fi architecture

The Lifi network can be used to strictly define the area upto which the data can be accessed enabling enterprises to enhancing the security of the propertiary data.

3. Healthcare

Li-Fi utilisation in Healthcare sector

Li-fi does not interfere with the MRI systems and other radio frequency based systems making allowing doctors to perform their tasks without any intervention.

There are numerous other applications of Li-fi which I have not listed here. It’s still in its development phase and not yet fully overthrown Wi-fi system anywhere in the world . But in the coming future it will provide limitless opputunities to the people around the world.

Towards a cleaner,brighter future

Towards a cleaner, greener , brighter future

Thank You for reading this article and I hope you have learnt a lot about the upcoming technology Li-fi .

Keep coming for more cool tech stuff like these. And don’t forget to give your valuable suggestions below.

Categories: Innovation

Leave a Reply

Your e-mail address will not be published. Required fields are marked *