We all have had experienced wifi at-least once in our life. movies, music, Facebook, and lot more, we have a lot good times with wifi technology, but is time to say good bye to wifi and welcome the new and advanced Li Fi technology (Light Fidelity) to even speed up our digital needs. you may be confused, If you have listened this for the first time. Li-fi is a new technology of light based wireless comunication, which is 100 times faster then our Wifi technology, which we are using currently. Lets get into the depth of new Li-fi technology in the wireless comunicaion system.

What is Li-Fi technology?

Li fi (Light Fidelity) is a visible light communication system (VLC). The new Li Fi technology uses the common house hold LED (Light Emitting Diodes) for data transfer and communication between devices, with the speed of data transfer rate up to 224 gigabytes per second. the Li-Fi is a bidirectional mobile communication technology system, which can be used to off-load data from existing wi-fi networks.

How Li-Fi Change the World?

History of Li-Fi?

The term Li-Fi was introduced for the first time in 2011, by Edinburgh professor Harald haas. During a TED talk, he has envisioned LED’s that could act as wireless routers, is led a way to light based communication techonolgy system that delivers 100 times faster data transfer than wi-fi between two li fi enabled devices.

After four years, in 2012 Mr. harald Haas started a company “pure Li Fi” with a goal to be the world leader in Visible Light Communications (VLC) technology.

How Li-Fi works?

Li Fi, Li Fi Technology, Wi Fi,

The Li-Fi technology is very similar to the Wi-fi, both transmit data electromagnetically. While the wi fi uses radio waves to communicate, the new Li fi technology uses Light Visible Communication (VLC) technology to data transfer.

A LED (Light Emitting Diode) is a two-lead semi-conductor light source, means the current of electricity supplied to a LED will be fluctuated, dipped and dimmed at extremely high frequency, which a human eye can’t see.

Using Signal Processing Technology, data signals will be embedded into the stream of light which is emitted by LED. This allows data transfer by modulating a stream of LED light source at different frequency levels. It then the signals received by photo-diode detectors, and can be converted into electrical signals.

These electrical signals then converted back into binary data stream like other radio systems, thus we can transfer data at the extremely high speed which is 100 times faster than present wi-fi.

Li-Fi vs Wi-Fi: Major Advantages and Disadvantages of Li-Fi over Wi-Fi.

Li-Fi Advantages:

  • Efficiancy: Li-Fi is a visible light communication (VLC) technology. LED lights now we are already using in our offices and homes can be used to transit data. To transmit the data signal the LED bulbs should be power-on. In day time, when there is no need electrical lights to be power-on, It can be reduced to a point to that human eye can’t notice but it will still on and working. Also it is very cost effeciant and as well as energy.
  • Availability: Wherever the light source is available, there can be the Internet. Since, LED lights are everywhere, with new light based wi-fi technology li-fi,  it can be possible to transmit high-speed data.
  • Security: One of the major advantages of Li-Fi is security. Since light cannot pass through non-transparent objects so Li-Fi network only is accessed by the users with in the room.

Li-Fi Disadvantages:

  • Network sharing cannot possible without the light source.
  • Li-fi is a visible light communication (VLC) technology so light can’t penetrate walls. The signal range is limited by physical barriers.
  • One the major disadvantage of Li-Fi is the Interception of signals. Other sources of light in a room or sun light at outdoors may interfere the signals. This will cause slow internet.

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