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1. Content Introduction History What is LIFI? Why LIFI over any other technologies Why VLC? How LIFI works? Block diagram Comparison between Various Technologies How it is different? Wifi vs Lifi Application Advantages Disadvantages Conclusion

2. Introduction LiFi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. LiFi is designed to use LED light bulbs similar to those currently in use in many energy-conscious homes and offices. However, LiFi bulbs are outfitted with a chip that modulates the light imperceptibly for optical data transmission. LiFi data is transmitted by the LED bulbs and received by photoreceptors.

3. History Professor Harald Haas, from the University of Edinburgh in the UK, is widely recognised as the original founder of Li-Fi. He coined the term Li-Fi and is Chair of Mobile Communications at the University of Edinburgh and co- founder of pureLiFi. Haas promoted this technology in his 2011 TED Global talk and helped start a company to market it. In October 2011, companies and industry groups formed the Li-Fi Consortium, to promote high-speed optical wireless systems. The first Li-Fi smartphone prototype was presented at the Consumer Electronics Show in Las Vegas from January 7–10 in 2014.

4. What is lifi? LI-FI ( Light Fidelity ) for wireless communication between device using light to transmit data. It is a faster and cheaper version of WIFI ,which based on Visible Light Communication(VLC). This technique uses visible light between 400THz to 800THz as an optical career for data transmission. The VLC requires a reciver ( Photo detector),a transmitter(LED) and a channel of communication.

5. WHY LIFI OVER any0ther technologies ? LIFI does not require LED bulbs : It has been proven that LED bulbs are not essential to implement the LIFI technology . To implement LIFI , just lighting source is required which is already present in your smartphone in the form of a flash light. If LIFI is introduced in the already present 14 billion light blubs, then the internet network can be more solidified and improved . LIFI can not be hacked , light source does not penetrate wall. LIFI can transfer data rates in gigabits per second. Very ecofriendly.

6. WHY VLC? Gama rays cannot be use as they could be dangerous. X-rays have similar health issues. 3. Ultraviolet light is also dangerous for human body. 4. Infrared can only be used with low power for eye safety. 5. Radio waves are expensive ,limited bandwidth. Hence We left with only the Visible Light Spectrum .

7. HOW LIFI WORKS ? If the LED in on , it transmitting data, means transmit digital 1 . If the LED is off it transmit a digital 0. The LED intensity is modulated so rapidly that human eye can not notice, so the output in form of light appears constant and hence offering permanent connectivity .

8. BLOCK DIAGRAM OF LIFI

9. Wi-Fi 150 Mbps Bluetooth 3 Gbps IrDA 4 Gbps Comparison between Various Technologies Wired Wireless(Current) Wireless(Future) Fire wire 800 Mbps USB 3.0 5 Gbps Thunderbolt 20 Gbps Li-Fi 10 Gbps Giga-IR 1 Gbps Wi-Gig 2Gbps

10. How it is different? Li-Fi technology is based on LEDs for the transfer of data. The transfer of the data can be with the help of all kinds of light, no matter the part of the spectrum that they belong. That is, the light can belong to the invisible, ultraviolet or the visible part of the spectrum.

11. Applications Ecofriendly Airlines Smarter Power Plants Undersea Awesomeness In army base.

12. Real life application An Ahmedabad startup has powered up two villages(Akrund & Navanagar) with high speed internet using LI-FI . Gujarat has become India's first smart village with LI-FI based connectivity . Oledcomm one of the leading LI-FI companies installed LI-FI technology at the Emergency Hospital Centre of Perpignan in 2014 . Philips lightings LI-FI enabled LED are currently being trailing LI-FI technology in real estate company ICADE’S office in La Defense, Paris .

13. Advantages of LI-FI Solve problems of radio frequency bandwidth High data transfer rate. High speed. High connectivity. Larger bandwidth. Since light cannot penetrate walls, it provides privacy and security that Wi-Fi cannot. low implementation and maintenance costs.

14. Disadvantage Light can't pass through objects. Initial cost is high. Special hardware needs. Limited range.

15. Conclusion Overcome the limitations of radio spectrum. High speed of 10 gbps can be achieved. The possibilities are numerous and can be explore further. This may solve issues of limited bandwidth of radio frequency. LI-FI is enabled by advance digital transmission technologies.

16. FUTURE SCOPE Where WIFI fails on an airplane and in submarines LIFI can be used. The future is bright for LIFI as a reliable, affordable and more secure solution. LIFI can be used in high security military areas. Replacements for other technologies.

17. References www.studymafia.org www.wikipedia.com www.google.com

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