Li-Fi system connecting devices in a room

A new generation of high brightness light-emitting diodes

forms the core part of light fidelity technology. The logic is

very simple. If the LED is on, a digital 1 is transmitted. If the

LED is off, a digital 0 is transmitted. These high brightness

LEDs can be switched on and off very quickly which gives us

a very nice opportunities for transmitting data through light.

The working of Li-Fi is very simple. There is a light

emitter on one end, for example, an LED, and a photo detector

(light sensor) on the other. The photo detector registers a

binary one when the LED is on; and a binary zero if the LED

is off. To build up a message, flash the LED numerous times

or use an array of LEDs of perhaps a few different colors, to

obtain data rates in the range of hundreds of megabits per

second.