How Lifi Works “Internet by Light”

high speed internet by light is conceivable. Learn how LiFi works to unlock the mysteries of future connections.

Visible light communication (VLC) technology is known as LiFi, which stands for Light Fidelity. In other words, LiFi depends on the usage of the electromagnetic spectrum’s optical half, while conventional technologies (such as WiFi, 5G, etc.) employ its radio portion.


This invention offers a high-speed Internet connection that is dependable, latency-free, and free of radio frequency waves as an alternative to existing technology. LiFi has shown its performance and security in various domains, so it is far from being an alluring concept. Learn how LiFi works to have a better understanding of how light is the future of connection.


How LiFI operates

LiFi signal transmission

LiFi uses a light beam that is aimed at a receiving device from an LED bulb to transmit data. This lightbulb has a LiFi router inside, which we’ll refer to as an access point, which is linked to the Internet network through an RJ45 Ethernet connection with PoE functionality. An electrical signal carrying the information is transferred from the network to the router. It is conveyed by the light source’s undetectable and very quick switching (change in light intensity).


taking in and analyzing the LiFi signal

The data sent by the router is received by the connected device (computer, smartphone, or tablet) equipped with a LiFi key that is situated in the range of the light beam. This component, which may be an integrated chip or a dongle that plugs into the device, has a photodiode that captures the light signal and a processor that turns it into an electrical signal. This electrical signal is received by the computer, which converts it into a binary system. After digital data is demodulated, it becomes its final form—information that can be understood by humans.


In a nutshell, how LiFi works

The four stages that make up the LiFi operation procedure are listed below:


The Ethernet wire connecting the LiFi router to the local network is used to transfer the data.

At a frequency of many tens of thousands or even millions of impulses per second, it sends it to the LED bulb, which oscillates rapidly.

The LiFi key detects the light signal, converts it to an electrical signal, and sends it to the computer.

The signal is converted by the computer into information that people can comprehend.

The connected device (or rather, the associated LiFi key) must be able to receive and send data in order for the user to access the Internet via the LiFi system. That suggests that the receiver must have two photodiodes, one for broadcasting information and the other for receiving it. There must be a receiver on the sending device.


The LiFi connection, which is very quick, trustworthy, and secure, is quickly gaining popularity. This technology, which is already in use in the aviation, transportation, and education industries, strives to provide the best connection everywhere radio waves are undesirable (interference, cybercrime, electromagnetic pollution, etc.).

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