Abstract- The first word that comes to your mind when you read the title is Wi-Fi (wireless fidelity), most of us are familiar to this, and it uses 2.4-5 GHz RF (radio frequency) to deliver internet access around a wide area. Whenever you are using internet over a wireless network you may be deprived of the speed over that network. As more and more users get connected to the network, the rate of data transfer gets reduced. So when people with their many devices access wireless internet, clogged airwaves are going to make it increasingly difficult to latch onto a reliable signal. The wireless network uses radio waves for the transmission of the data. But radio waves are just one part of the spectrum that can carry our data. We have become quite dependent upon this nearly ubiquitous service. But like most technologies, it has its limitations. So a question arises in our mind that can’t we use the other part of the spectrum? The answer is “YES”. The part of spectrum that we can use conveniently is the visible spectrum. German physicist, Dr. Harald Haas, has put forward the idea of “Data through Illumination” 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 follow. 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 speedier than your average broadband connection. He envisions a future where data for laptops, smart phones, and tablets is transmitted through the light in a room. And security would be snap – if you can’t see the light, you can’t access the data. Optical wireless technologies, sometimes called visible light communication (VLC), and more recently referred to as Li-Fi (Light Fidelity), on the other hand, offer an entirely new paradigm in wireless technologies in terms of communication speed, flexibility and usability. In simple words Li-Fi is a method of communication in which we transmit data using visible light region of electromagnetic spectrum with the help of LEDs. So by Li-Fi you attain data transmission by using your simple light resources. So you can now connect to internet where ever you find light, in schools, colleges, offices, aircrafts and even on the roads and almost everywhere because there are rare places where light is not present. 

[1].         Akshata m sonnad, anjanagopan, sailakshmi n r,divya s, ambika r, “recent advancements in li-fi technology” international journal of electrical, electronics and data communication, volume-1, issue-10, dec-2013 issn: 2320-2084.

[2].         Balaramghosal ,asimkumar panda “li-fi a green energy initiative”international journal of computer applications (0975 – 8887) volume 95– no. 11june 2014.

[3].         Jay h. bhut, dharmrajsinh n. parmar, khushbu v. mehtaelectronics & communication engineering, marwadi education foundation, rajkot, india. Communication system engineering, charusat university, changa,india “li-fi technology – a visible light communication”issn: 2321-9939

[4].         Jyoti Rani1, Prerna Chauhan2, Ritika Tripathi3 International Journal of Applied Engineering Research,ISSN 0973-4562 Vol.7 No.11 (2012) active developer of systems for people with disabilities for the past 18 years.

[5].         Ian Lim, ‘Li-Fi – Internet at the Speed of Light’, the gadgeteer, 29 August 2011

[6].         http://electronicsforu.com/electronicsforu

[7].         http://en.wikipedia.org/wiki/Li-Fi

[8].         “New Epoch of wireless communication: Light Fidelity”IJIRCCE, vol 1,issue 2,April 2013.

[9].         Dobroslav Tsonev, Sinan Sinanovic and Harald as, “Novel Unipolar Orthogonal Frequency Division Multiplexing (U-OFDM) for Optical Wireless”, IEEE, 2012

[10].      Nam-Tuan Le and Yeong Min Jang, “Virtual ognitive MAC for Visible Light Communication System”, International Journal of Smart Home,Vol. 6, No. 2, pp.: 95-100, 2012 11. Harald Burc