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Abstract
With advent of various technologies of communication a person can access the whole world at one go. The impact of internet on our day to day life has been so huge that we could not think of a day without it. It has become a fundamental requirement in our daily lives. Survey reports show that nearly 46% of homes throughout the world have access to the internet. And the percentage is growing each day. With such a high rising demand there has been a looming crisis of Radio Frequency spectrum, which paved the way of the invention of the new technology:-LI-FI. LI-FI, acronym of light fidelity, is a modern wireless technology which has the ability to provide high speed internet connection within localized environment. Till today we are familiar with WI-FI which has been using radio frequency spectrum for its communication. Even though it gives a speed of nearly 150mbps (as per IEEE802.11n), it isn’t sufficient to satisfy all users. On the other hand LI-FI uses spectrum which comprises a wide range of frequencies, from the infrared through visible, down to the ultraviolet spectrum for communication which has the ability to produce a theoretical speed of 10Gbps. Actually this technology comprises of sub- gigabit and gigabit-class communication speeds for short, medium and long ranges, as well as has the option of unidirectional or bidirectional data transfer using line-of-sight or diffuse links, reflections and much more. It is not only confined to LED or laser technology or to any specific receiving
technique, LI- FI is a framework for all those technologies which provides new ways to all present as well as future services or applications