1. Li-Fi & All about it
Light Fidelity & How it will change the way we perform data transfers!!

2. Index Introduction History Current technologies What is Li-Fi?
How does it work?
How is it different from other technologies?
Wi-Fi vs. Li-Fi
Applications & Real life usage
Advantages
Disadvantages
Conclusion

3. Introduction
Li-Fi is a wireless optical networking technology that uses light- emitting diodes (LEDs) for performing data transfers of all sorts.
Li-Fi uses LED light bulbs with just a few changes that enable them to transfer data on certain frequencies. e of light emitted from the LEDs.
These modifications don’t have any special changes on the amount/type of light emitted by these LEDs.
Li-Fi data is transmitted by the LED bulbs and received by photoreceptors in receiving device.

4. History
Harald Haas, who is a professor at the University of Edinburgh, UK is the original founder of Li-Fi.
The term Li-Fi was coined by him and he is the Chairperson of Mobile Communications at the University of Edinburgh. He has also co- founded of pureLiFi.
Harald Haas first presented this technology in public in his much talked about 2011 TED Global talk and he also helped start a company in order 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 to the world at the Consumer Electronics Show, Las Vegas in the January of 2014.

5. Problem with these technologies
Current Technologies
Wired data transfer
Wi-Fi – Wireless data transfers
Mobile data transfers using Bluetooth & Infrared
Optical Fiber based data transfers
Near Field Communication
Problem with these technologies
Wireless data transfer technologies like Bluetooth, Infrared or even NFC aren’t much reliable.
They either provide less speed of data transmission or just aren’t secure enough.

6. What is Li-Fi?
Li-Fi stands for Light Fidelity and it is a technology that aims to provide faster and more secure data transfer applications using LED lights.
These LED light bulbs are just modified with a chip that regulates the frequency at which these bulbs work to be able to use them properly for data transfers.
Li-Fi uses the visible light portion of the electromagnetic spectrum to transfer data at very high speeds.
This is in contrast to established forms of wireless communication such as Wi-Fi which use traditional radio frequency (RF) signals to transmit data.

7. How does Li-Fi work?

8. How does Li-Fi work?
Data from the internet and local network devices like a NAS etc. are connected to a router that converts the data into proper light frequencies.
The data in light form is then transmitted through the LED light bulb.
It is received by Photo Receptors which then convert the data into proper mobile format that the receiving device can easily reproduce on it’s screen.

9. How is it different from other technologies?
Li-Fi technology uses household LED bulbs for the transfer of data.
The transfer of the data can be made with all kinds of light, no matter what part of the spectrum they belong to.
That is, the light can belong to the invisible, ultraviolet or the visible part of the spectrum as well.

10. How is it different? – Speed Comparisons
Wired
Fire wire: 800 Mbps
USB 3.0: 5 Gbps
Thunderbolt: 20 Gbps
Wireless (Current standard)
Wi-Fi: 150 Mbps
Bluetooth: 3 Gbps
IrDA: 4 Gbps
Wireless (Upcoming Standards)
Li-Fi: 10 Gbps
Giga-IR: 1 Gbps
Wi-Gig: 2 Gbps

11. Wi-Fi vs. Li-Fi
Li-Fi can be referred to as as a light-based Wi-Fi which means that it uses light instead of radio waves to transmit information.
Instead of Wi-Fi modems, Li-Fi will use transceiver-fitted LED lamps that can light a room as well as transmit and receive information.
Wi-Fi is great for general wireless coverage within building whereas Li-Fi is ideal for high density wireless date coverage in confined area and for relieving radio interference issues.
So the two technologies can be considered complimentary and can co-exist together.

12. Applications & Real life usage
Free Radio Spectrums: A lot of free radio spectrum will be available as Li-Fi can be used to free some busy spectrums in a confined area.
Smart Lighting: Any private or public lighting including street lamps can be used to provide Li-Fi hotspots and the same communications and sensor infrastructure can be used to monitor and control lighting and data.
Mobile Connectivity: Laptops, smart phones, tablets and other mobile devices can interconnect directly using Li- Fi. Short range links give very high data rates and also provides security.
Hazardous Environments: Li-Fi provides a safe alternative to electromagnetic interference from radio frequency communications in environments such as mines and petrochemical plants.
Location Based Services (LBS): Highly accurate location-specific information services such as advertising and navigation that enables the recipient to receive appropriate, pertinent information in a timely manner and location.
A lot of other applications and the list will grow with time!

13. Applications & Real life usage

14. Advantages of Li-Fi
Li-Fi can solve problems related to the insufficiency of radio frequency bandwidth because this technology uses Visible light spectrum that has still not been greatly utilized.
High data transmission rates of up to 10Gbps can be achieved.
Since light cannot penetrate walls, it provides privacy and security that Wi-Fi cannot.
Li-Fi has low implementation and maintenance costs.

15. Disadvantages of Li-Fi
Light can't pass through objects.
A major challenge facing Li-Fi is how the receiving device will transmit back to transmitter.
High installation cost of the VLC systems.
Interferences from external light sources like sun, light, normal bulbs, opaque materials.

16. Conclusion
Li-Fi as a proper technology is still in its infancy and it will take a lot of work, research and capital in order to bring this to end consumers.
The possibilities are numerous and can be explored further.
If his technology can be put into practical use, every bulb can be used something like a Wi-Fi hotspot to transmit wireless data and we will proceed toward the cleaner, greener, safer and brighter future.