Lifi Technology

Abstract

As we moving in new Technology era our demands also exceeds we need more reliable technology faster more secure. In the days where internet has become a major demand, people are in a search for Wi-Fi hotspots. Li-Fi or New Life of data communication is a better alternative to Wi-Fi in wireless communication. As more and more people and their many devices access wireless internet, clogged airwaves are going to make it increasingly difficult to latch onto a reliable signal. But radio waves are just one part of the spectrum that can carry our data. What if we could use other waves to surf the internet? German physicist, DR. Harald Haas, has come up with a solution he calls “Data Through visible light communication” taking the fiber out of fiber optics by sending data through an LED light bulb that varies in intensity faster than the human eye can detect. It’s the same idea behind infrared remote controls, but far more powerful. Haas says his invention, which he calls D-Light, can produce data rates faster than 10 megabits per second, which is far quicker than your average broadband connection. He envisions a future where data for laptops, smartphones, and tablets is transmitted through the light in a room or you can exchange data under street light. And security would be a snap if you can’t see the light, you can’t access the data. The concept of Li-Fi is data communication on fast flickering of light which is not detected by human eye but it is focused on photo detector which converts the on-off state into binary digital data.

Li-Fi is a VLC, visible light communication, technology developed by a team of scientists including Dr Gordon Povey, Prof. Harald Haas and Dr Mostafa Afgani at the University of Edinburgh. Light Fidelity (Li-Fi) is a bidirectional, high-speed and fully networked wireless communication .The term Li-Fi was coined by Prof. Haas when he amazed people by streaming high-definition video from a standard LED lamp, at TED Global in July 2011. Li-Fi is now part of the Visible Light Communications (VLC) PAN IEEE 802.15.7 standard. “Li-Fi is typically implemented using white LED light bulbs. These devices are normally used for illumination by applying a constant current through the LED. However, by fast and subtle variations of the current, the optical output can be made to vary at extremely high speeds. Unseen by the human eye, this variation is used to carry high-speed data” says Dr Povey, Product Manager of the University of Edinburgh's Li-Fi Program ‘D-Light Project’.