In the same room where your smartphone connects to the Wi‑Fi network via radio waves, there may be another source that can transmit data in a completely different way: light.
LiFi technology, or "visible light communication," can turn a regular ceiling lamp into a point for data transmission; thus, the light source, in addition to illuminating the environment, also enables wireless communication with compatible devices.
When a lamp takes the place of a router
Wi‑Fi uses radio waves to transmit data between the router and connected devices. LiFi, however, takes a different path and transfers information via light.
In this technology, a light source equipped with special equipment can change its light intensity at very high speed. These changes are used to encode and transmit data, but they are so fast that the human eye cannot detect the lamp blinking.
LED lamps are a suitable option for this technology because their light intensity can be changed quickly. On the other side, the receiving device uses a photodetector to convert received signals into digital information.
High speed; one of the most important advantages
One of the attractions of optical communications is the ability to use a wide portion of the light spectrum for data transmission. This feature has led researchers and companies active in communications to develop technologies that offer high data transmission capacity in specific environments.
However, LiFi is not going to easily replace Wi‑Fi. The most important limitation of this technology is related to the nature of light itself: light cannot pass through walls like radio waves.
As a result, the presence of an obstacle or interruption of the path between the light source and the receiver can affect the connection and limit LiFi's coverage range. Of course, this characteristic can become an advantage in some applications; because it allows creating a limited and defined connection within a given space.
From home and office to airplane and hospital
LiFi can be used in environments such as homes, offices, factories, airplanes, and hospitals; especially in places where reducing interference with radio communications is important.
For example, each light source can be turned into a specific access point so that devices within the light range connect to the network. Such an approach can also be useful in environments with a large number of connected devices; because multiple light sources can create more local and dedicated communications.
This feature can be particularly important for environments where many devices are simultaneously exchanging data.
Is LiFi the end of Wi‑Fi?
Despite LiFi's technical capabilities, the emergence of this technology does not mean the imminent end of Wi‑Fi networks or radio‑wave‑based communications. Both technologies have different strengths and limitations and will likely be used alongside each other in many applications.
The future of wireless communications may move more toward hybrid networks; networks in which LiFi is used for situations where speed, capacity, or defining the connection area matters, and radio waves continue to play their role for conditions where mobility, wide coverage, or passing through obstacles is necessary.
Therefore, the main question is probably not whether light will replace radio waves; rather, it is how these two technologies can be used together to create more flexible and efficient networks.