Next Generation Communication Li Fi Technology

Li fi is a method of transmitting data wirelessly using LED ( = light-emitting diode). Li fi is known as light fidelity. It is a cheap wireless-communication system, which is the optical version of wi fi. In this method data is transmitted by the light, so its speed is same as the speed of light. This technology is first demonstrated in the context by German physicist Harald Haas in his TED Global talk on Visual Light Communication. The LED bulb will hold a micro-chip that will process the data. Intensity of light can be manipulated to send data by tiny changes in amplitude. This technology uses visible spectrum of light, a part of the electromagnetic spectrum that is still not greatly utilized. There for the technology transfers thousands of streams of data simultaneously, in parallel, in higher speeds with the help of special modulation, using a unique signal processing technology. Li-Fi has the advantage of being able to be used in sensitive areas such as in aircraft without causing interference. However, the light waves used cannot penetrate walls. This is the major problem coming across the implementation of this technology. A possible solution of this problem is the replacing all the lights by the LED lamps. The lamp generates the data signal as well as it is also used for the lightening. But size of the lamp is larger than conventional bulbs. Research on reducing the size is going on. This paper describe method of transmitting data through li fi technology, various component used, the advantages of this technology over the other presence method of data transmission, the difficulties faced during implementation and their possible solution