Li-Fi is a bidirectional, high-speed and fully networked wireless communication technology similar to Wi-Fi. Like Wi-Fi, Li-Fi is wireless and uses similar 802.11 protocols; but it uses visible light communication (instead of radio frequency waves), which has much bigger bandwidth.
How it works?
Visible light communications (VLC) works by switching the current to the LEDs off and on at a very high rate too quick to be noticed by the human eye. Li-Fi LEDs would have to be kept on to transmit data, they could be dimmed to below human visibility while still emitting enough light to carry data. The light waves cannot penetrate walls which makes a much shorter range, though more secure from hacking, relative to Wi-Fi. Direct line of sight is not necessary for Li-Fi to transmit a signal; light reflected off the walls can achieve 70 Mbit/s.
Bg-Fi is a Li-Fi system . It consist application for a mobile device, and a simple consumer product, like an IoT (Internet of Things) device, with color sensor, microcontroller, and embedded software. Light from the mobile device display communicates to the color sensor on the consumer product, which converts the light into digital information. Light emitting diodes enable the consumer product to communicate synchronously with the mobile device.
Li-Fi uses common household LED (light emitting diodes) light bulbs to enable data transfer, boasting speeds of up to 224 gigabits per second.Last year, it was reported that Li-Fi was being tested in Dubai, by UAE-based telecommunications provider, du and Zero1. Du claimed to have successfully provided internet, audio and video streaming over a Li-Fi connection.
Li-Fi cannot pass through walls, so in order to compete with Wi-Fi and provide a large area of connectivity, LED bulbs will need to be placed throughout the building. These bulbs will also need to be on 24-7 to provide the kind of connectivity offered by Wi-Fi routers. This means the light bulbs will also need to be on to provide the signal.