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I am a blogger and love my job, my life. I'd like to share some experience in telecom field here, hope you enjoy your stay at my blog!

01 Dec

Li-Fi – 100 Times Faster Than Wi-Fi

Publié par Angelina Li  - Catégories :  #telecom technology

Have you gotten frustrated at the slow internet speeds when you’re using wireless internet (wi-Fi) in a coffee shop, stealing it from next door, or competing for bandwidth at a conference? Now Li-Fi, a super-fast alternative to Wi-Fi, will be a great solutiuon to your problems. It has been proven capable of sending data at up to 1GBps in real-world tests and enables a high-definition film to be downloaded in seconds. Today’s article provides a brief introduction to Li-Fi. Let’s enjoy this new technology.

What Is Li-Fi?
It is nearly impossible to avoid Wi-Fi in today’s world, it’s everywhere. We all know about Wi-Fi, but what is Li-Fi?


Li-Fi stands for Light-Fidelity. This technology is very new and was proposed by the German physicist Harald Haas in 2011. It is a bidirectional, high speed and fully networked wireless communication technology similar to Wi-Fi. Li-Fi transmits data through illumination using an LED light bulb, which can be the technology for the future where data for laptops, smart phones, and tablets will be transmitted through the light in a room.

How Does It Work?
Li-Fi is the fast and cheap optical version of Wi-Fi. It is based on Visible Light Communication (VLC) for data communicatin. The operational procedure is very simple, according to professor Harald Haas, if the LED is on, you transmit a digital 1, if it’s off you transmit a 0. The following image shows the working principle of Li-Fi technology.

working principle of li-fi-technology

With Li-Fi enabled LED light bulbs, a controller is used to transmit encoded data into those LEDs. An optical sensor is used to receive the data, which is then decoded. This is conceptually similar to Morse code —but at rates of many millions of times a second, which is imperceivable to the human eye. The receiver has optics, and is fast enough to ‘see’ the light dimming and brightening, smart enough to decode the Li-Fi data, and then deliver it to the attached device such as a laptop. Devices can include both a transmitter and receiver to enjoy two-way communications. All one has to do is to vary the rate at which the LED’s flicker depending upon the data we want to encode.

The Difference Between Li-Fi and Wi-Fi Is...?
Li-Fi is said to be 100 times faster than Wi-Fi and will replace Wi-Fi in the near future. But how does that happen? What is the differnece between them? Here are three basic issues concerning about the differences.

  • Availability

Wi-Fi uses radio frequencies, and these are very limited and expensive. Availability of radio waves is a big concern. It is not advisable to use mobile phones in aero planes and at places like petrochemical plants and petrol pumps. Availability is not an issue for Li-Fi as light sources are present everywhere. There are billions of light bulbs worldwide; they just need to be replaced with LEDs for proper transmission of data.

  • Security

Radio waves that was used by Wi-Fi to transmit data signals can penetrate through walls and ceilings. They can be intercepted. Light doesn’t. An hacker, outside a building can tap into the Wi-Fi data communications of computers inside the building. While data communicated via LiFi can only be accessed where the LED light illuminates. This causes a major difference between Li-Fi and Wi-Fi.

  • Speed

Wi-Fi standard provides data communication rates up to 54Mbps. However, there are techniques available to extend this to 1Gbps. But the University of Edinburgh, Prof. Harald Haas – “the father of Li-Fi” have already demonstrated 3Gbps on a single color. On a single LED with full color (R,G,B) this could communicate at speeds up to 9Gbps.

The concept of Li-Fi is currently attracting a great deal of interest not only because it may be a genuine and very effcient alternative to Wi-Fi, but it makes us embrace a cleaner, greener, safer and brighter future. Fiberstore is always committed to provide best service and high-quality products to subscribers. For instance, EX-SFP-1GE-SX, Cisco DS-SFP-FC8G-SW and 45W1216 are provided at Fiberstore with high-guality and low price. We all believe technology can change the world.


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I am a blogger and love my job, my life. I'd like to share some experience in telecom field here, hope you enjoy your stay at my blog!