Li-Fi Technology                                             

Professor Harald Haas, from the University of Edinburgh in the UK, is widely recognized as the original founder of Li-Fi. He coined the term Li-Fi and is Chair of Mobile Communications at the University of Edinburgh and co-founder of pure LiFi

Li-Fi is a new way to establish wireless communication links using the Led lighting networks. The LiFi protocols are defined by the international standard IEEE 802.15 established since 2011 by the IEEE comity. This is the same comity that has defined previously the Ethernet 802.3 and Wi-Fi 802.11 standards. For numerous specialists, LiFi is a major breakthrough technology for the mobile Internet community and for the connected objects domain.

Li-Fi is designed to use LED light bulbs similar to those currently in use in many energy-conscious homes and offices. However, LiFi bulbs are outfitted with a chip that modulates the light imperceptibly for optical data transmission. LiFi data is transmitted by the LED bulbs and received by photoreceptors.

Li-Fi's early developmental models were capable of 150 megabits-per-second (Mbps). Some commercial kits enabling that speed have been released. In the lab, with stronger LEDs and different technology, researchers have enabled 10 gigabits-per-second (Gbps), which is faster than 802.11ad. 

Benefits of LiFi:

• Higher speeds than Wi-Fi.
• 10000 times the frequency spectrum of radio.
• More secure because data cannot be intercepted without a clear line of sight.
• Eliminates neighboring network interference.
• Unimpeded by radio interference.
• Does not create interference in sensitive electronics, making it better for use in environments like hospitals and aircraft.

By using LiFi in all the lights in and around a building, the technology could enable greater area of coverage than a single Wi-Fi router. Drawbacks to the technology include the need for a clear line of sight, difficulties with mobility and the requirement that lights stay on for operation.

 Working of Li-Fi Technology

The functioning of new Li-Fi technology is just simple. You will have a light source at one end like a LED and a photo detector (Light Sensor) on the other end.

As soon as, LED starts glowing, photo detector or light sensor on other end will detect light and get a binary 1 otherwise binary 0.  How can data be transmitting via this new Li-F- technology?

Flashing a LED certain times will build up a message to transmit. Flashing of light is detected by the photo detector or light sensor and it will receive a message.

                                                                                                                                                                                                          

 

This is the LiFi network