What Is Li-Fi- How It Work

  • Wed, 03/02/2016 - 16:23 by aatif


Li-Fi stand for Light Fidelity is a fully networked wireless communication technology. It is similar to Wi-Fi technology. It is a visible light communication (VLC) which runs on wireless communication at high speeds. Its speed is up to 224 gigabits per seconds. Li-Fi use common household LED (light emitting diodes) light bulbs to enable data transfer. During experiment, it is measured that Li-Fi is 100 times faster as compared to Wi-Fi.

University of Edinburgh Professor Harald Haas given the visible light communication coined. In 2011, during TED Talk Harald Haas envisioned light bulbs that could act as wireless routers. PureLiFi a company made by Haas, the purpose of making this company was to become the world leader in Visible Light Communications technology.

How Li-Fi Work

Both Li-Fi and Wi-Fi transmit data electronically, therefore they are quite similar technologies. But Li-Fi use visible light communication to carry signals and Wi-Fi use radio waves to carry signals. Wi-Fi signals pass through walls and provide full connectivity facilities, but Li-Fi signals cannot pass through walls and it requires the light bulb is on at all times to provide connectivity. When the bulb is off internet connection breakdown.

According to pureLiFi, Li-Fi Work as:

When a constant current is applied to an LED light bulb a constant stream of photons are emitted from the bulb which is observed as visible light. If the current is varied slowly the output intensity of the light dims up and down. Because LED bulbs are semi-conductor devices, the current, and hence the optical output, can be modulated at extremely high speeds which can be detected by a photo-detector device and converted back to electrical current. The intensity modulation is imperceptible to the human eye, and thus communication is just as seamless as RF. Using this technique, high speed information can be transmitted from an LED light bulb.

Li-Fi with the integration of IoT devices provide numerous benefits to individual and businesses. It can increase the productivity of businesses by providing fast, secure and cheap internet. But it takes some time to come fully into practice and when Li-Fi-enabled devices come into the market.