What is Li-Fi?

What is Li-Fi?

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, offering a substantially similar user experience to Wi-Fi except using the light spectrum.

Connectivity is evolving. The spectrum now has to accommodate more mobile users. Connected devices are forecasted increase to 20 Billion IoT devices by the year 2020. It is time to future proof our networks to enable the connectivity demands of tomorrow. With LiFi we can utilise spectrum more than 1000 times greater than the spectrum utilised for radio frequencies. LiFi is now unlocking unprecedented data and bandwidth.

LiFi is a category of Optical Wireless Communications (OWC). OWC includes infra-red and ultra-violet communications as well as visible light. However, LiFi is unique in that the same light energy used for illumination may also be used for communication.

The term LiFi was coined by pureLiFi’s CSO, Professor Harald Haas, at a TedGlobal Talk back in 2011 where he demonstrated LiFi for the first time.

How it works?

How it works?

LiFi allows for data to be transmitted by modulating the intensity of light, which is then received by a photo-sensitive detector. 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.

LiFi can work indoors, outdoors, with the lights dimmed and is not strictly line-of-sight technology. pureLiFi’s technology is also LED agnostic which means it works with many off-the-shelf LED’s. 

The way LiFi works is simple but powerful. 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. LED bulbs are semiconductor devices, which means the current, and therefore the illumination can be modulated at extremely high speeds which can be detected by the photo-detector. Using this technique allows for high-speed information can be transmitted from an LED light bulb.

Radio frequency communication requires radio circuits, antennas and complex receivers, whereas LiFi is much simpler and uses direct modulation methods similar to those used in low-cost infrared communications devices such as remote control units. LED light bulbs have high intensities and therefore can achieve very large data rates.

Applications & BENEFITS

The applications for LiFi are limitless. Anywhere there is an LED light there can be data. LiFi is a platform technology that will extend the capabilities of wireless communications to places beyond even our current conception.

Today there are real life applications and benefits for implementing LiFi. LiFi can enable secure wireless communications, connectivity in RF hostile environments such as petrochemical plants and hospitals. LiFi also provides high speed, dense and reliable networks for enterprise environments and a pathway to enable smart buildings, transport, cities, and nations. 

White paper

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This is an eight-page document provides more information on the LiFi-X. The LiFI-X is the world's fastest, smallest and most secure LiFi dongle on the market. The document also provides answers to the most frequently asked questions (FAQ) about LiFi.

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gradient image Shedding Light on Li-Fi

It’s impossible to avoid Wi-Fi in today’s world. It’s everywhere; your neighbours have it, it’s free in coffee shops, and essential for smartphones. We all know Wi-Fi, but what is Li-Fi?

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