What is Li-Fi technology?

Li-Fi(Light fidelity) Technology

Li-Fi is called internet at the speed of light. LiFi technology will allow us to connect to the internet using light from lamps, streetlights or LED televisions. In addition to being cheaper, safer and faster than wifi, it does not need a router. All you need to do is point your mobile or tablet towards a light bulb to surf the web.

 

WHAT IS Li-Fi TECHNOLOGY?

LiFi (light fidelity) is a bidirectional wireless system that transmits data via LED or infrared light. It was first unveiled in 2011 and, unlike wifi, which uses radio frequency, LiFi technology only needs a light source with a chip to transmit an internet signal through light waves.

This is an extraordinary advance over today's wireless networks. LiFi multiplies the speed and bandwidth of wifi, 3G and 4G. The latter have a limited capacity and become saturated when the number of users surfing increases, causing them to crash, reducing speeds and even interrupting the connection.

With LiFi, however, its band frequency of 200,000 GHz, versus the maximum 5 GHz of the wifi, is 100 times faster and can transmit much more information per second. A 2017 study by the University of Eindhoven obtained a download rate of 42.8 Gbit/s with infrared light with a radius of 2.5 metres, when the best wifi would barely reach 300 Mbit/s.

HOW Li-Fi TECHNOLOGY WORKS?

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.

LiFi is high speed, bidirectional, and fully networked wireless communication of data using light. LiFi constitute of several lightbulbs that form a wireless network.

When an electrical current is applied to a LED light bulb a stream of light (photons) is emitted from the bulb. LED bulbs are semiconductor devices, which means that the brightness of the light flowing through them can be changed at extremely high speeds. This means that the signal can be sent by modulating the light at different rates. The signal can then be received by a detector which interprets the changes in light intensity (the signal) as data.  Also when the LED is ON, you transmit a digital 1 and when it is OFF you transmit a 0.  

LIFI VS. WIFI: WHICH IS BETTER?

LiFi technology is faster, cheaper and even more secure than wifi. Its main advantages include:

Faster: the current speed of wifi oscillates between 11 and 300 Mbit/s, while that of LiFi is also highly variable according to the last studies carried out. The most widely accepted speed is 10 Gbit/s, but it has been proven that it could reach 224 Gbit/s and that a 1.5 Gbit film could be downloaded in thousandths of a second.

Cheaper and more sustainable: it is up to 10 times cheaper than wifi, requires fewer components and uses less energy. All you have to do is turn on a light!

More accessible: any light fitting can easily be converted into an internet connection point, as only a simple LiFi emitter needs to be fitted.

More secure: light does not pass through walls like radio waves do, and this prevents intruders from intercepting LiFi communications through a wireless network.

More bandwidth: the light spectrum is 10,000 times wider than the radio spectrum, which increases the volume of data it can carry and transmit per second.

More reliable: LiFi transmits its signal without interruptions, making communication more stable than with wifi.

No interference: electronic light does not interfere with radio communications, interact with other systems or compromise transmissions from aircraft, ships, etc.

Wireless and invisible: LiFi takes advantage of lights and dispenses with the router, so it works without the need for cables. In addition, it can operate with infrared light, which is invisible to the human eye, or with visible LED light at very low intensity so as to avoid disturbance.

No saturation: internet connection via light could prevent the collapse of the radio spectrum which, according to LiFi's inventor Harald Haas, could take place by 2025.

With the emergence and development of LiFi technology, many foreshadow the obsolescence of wifi and other wireless networks. We will have to wait a few more years to see if streetlights, in addition to illuminating our streets, will connect us to the internet at the speed of light.

VISION FOR THE TECHNOLOGY

As the world evolves into the era of the internet of things & 5G/6G, the requirement for wireless networks that can meet the never-ending need of data communication is of paramount importance. Our band of geeks here at Velmenni believes that a lot of value can be created by assisting in the continued innovation and research in & around the world of LiFi. We aim to evolve LiFi through impactful resources and to build futuristic applications of it in various domains.