Lifi- Internet at the Speed of Light

Li-Fi or Light Fidelity refers to Visual light communication systems using light-emitting diodes for medium to high-speed communication in a similar manner as Wi-Fi. Li-Fi is the result of the research of a germen physicist Harald Hass which he calls “data through illumination.� He envisions ‘data from the laptops, smart phones and tablets to be transmitted through the light in the room‘. Wi-Fi makes up to 60% of the total internet traffic and Li-Fi is a better alternative to Wi-Fi in wireless communication. This paper proposes a survey on Li-Fi Technology. Li-Fi has data rate of 100 megabytes per second which is faster than your average broadband connection [9]. It provides security as the visible light is unable to penetrate through the walls which is a major issue with Wi-Fi as it uses radio waves for transmission .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. It has gained a huge popularity in two years of its invention. Such technology has brought not only greener but safer and cheaper future of communication which is the need of the hour.