Technology

Li-Fi – More than Wi-Fi

Harley Kumar
Written by Harley Kumar

Architecture of Li-Fi
Light–Fidelity (Li-Fi)
technology came into existence in 2011. The term was first used by Harald Haas in his TED Global talk on Visible Light Communication. It allows wireless communication without the use of radio waves, which can be dangerous in places like oil platforms, underwater and on planes. Li-Fi can be thought of as a light-based Wi-Fi.

Heart of Li-Fi  technology  is  high  brightness LED’s.  The  LED   bulb   will  hold a micro-chip that will do the job of processing the data. The on-off activity of LED’s enables a kind of data transmission using binary codes. Switching on an LED is a logical “1”; switching it off is a logical “0”. A light sensitive device (photo detector) receives the signal and converts it back into original data.

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VISIBLE LIGHT COMMUNICATION: Li-Fi is a faster and cheaper version of Wi-Fi, which is based on Visible Light Communication. The visible light communication is a data communication technique using visible light between 400 THz and 800 THz as an optical carrier for data transmission.

Devices  used  in  Visible  Light  communication:  Devices  which  are  used for transmission purpose in VLC are visible light LED and fluorescent lamp. This technology uses fluorescent lamps to transmit signals at  10bit/s,  or  LED’s            for upto 500 Mbit/s. Devices which are used for reception purpose in visible light communication are photo diodes and image sensor

Comparison of Li-Fi with present transmitting technologies:

Wi-Fi : 150 Mbps,               Bluetooth: 3 Mbps,                        IrDA: 4 Mbps,                       Li-FI: > 1 Gbps.

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Source: Wikipedia, Google

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Harley Kumar

Harley Kumar

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