LI-FI technology uses visible light communication and light-emitting diodes to transmit data wirelessly. It was invented by Harald Haas at the University of Edinburgh. LI-FI is expected to be faster, more energy efficient, and more secure than existing Wi-Fi technology. It could be used in places where Wi-Fi poses issues, like hospitals, nuclear power plants, and aircraft. Challenges include the need for direct line of sight and developing effective bidirectional transmission. Potential applications include use in traffic lights, street lamps, and smart power plants.

1. LI-FI TECHNOLOGY
BY
SRICHARAN RAVI
AJITH KUMAR RAVI

2. CONTENTS
• PREFACE
• LI-FI WHAT AND WHY ?
• HISTORY OF LI-FI
• WORKING TECHNOLOGY
• THE ABODE FOR INTERNET
• SECURITY
• WIRELESS TECHNOLOGIES
• COMPARISON BETWEEN LI-FI
& WI-FI
• GAINS
• LOSES
• APPLICATIONS
• CONCLUSIONS
• CREDITS AND SOURCE

3. PREFACE
This presentation is delivered to you for improving the
knowledge about LI-FI technology which is going to
produce a revolution in the network world .we would
like to convey our gratitude to our Principal, Head of
Dept., our beloved staffs(Comp.Engg.) ,all our
friends and parents for encouraging us.

4. LI-FI WHAT AND WHY?
• LI-FI, or "light fidelity", refers to wireless communication systems.
• LI-FI is expected to be ten times cheaper than Wi-Fi.
• It is used in electromagnetic sensitive areas.
• The system relies on light to send and receive data wirelessly.
• LI-FI is ten times faster than Wi-Fi.

6. Harald Haas of University of Edinburgh-Founder of LI-FI

7. HISTORY
• The founder of LI-FI was Harald Haas of University of Edinburgh.
• They set up a company named Visible Light Communication(VLC) to explore the
technologies using light in 2011.
• LI-FI promises to be cheaper and more energy-efficient than existing wireless
radio systems.
• The bandwidth of Visible light is 10,000 times bigger than the radio frequency.
• Prof. Haas Harald quotes that evenly spaced LED transmitters could provide
consistent internet connectivity.

10. THE ABODE FOR INTERNET
• LI-FI technology transmits data wirelessly at high speeds with the use of light
emitting diodes.
• With the invention of new LI-FI technology, we will soon find light bulbs of a car,
light lamps in our rooms, lights in subway, flashlight of our mobiles and any other
light source are providing internet access at very high speed.

11. SECURITY
• Secure data transmission is a critical and increasingly challenging issue.
• Today’s wireless technology uses common radio waves to carry sensitive and
private data from one source to another.
• Radio waves easily transmit through solid objects such as walls, leaving wireless
data vulnerable to collection by unauthorized entities.
• Light transmission does not penetrate solid objects and can be contained within a
given area, adding an additional layer of security and protection.

13. WIRELESS TECHNOLOGIES
Wireless(current) Speed Density
• Wi-Fi – IEEE 802.11n 150 Mbps *
• Bluetooth 3 Mbps **
• IrDA 4 Mbps ***
Wireless(future)
• WiGig 2 Gbps **
• Giga-IR 1 Gbps ***
• LI-FI <10Gbps ****

14. COMPARISON BETWEEN LI-FI & WI-FI
Wireless Fidelity(Wi-Fi)
• Wi-Fi network makes use of radio
waves to transmit information across
a network.
• Wi-Fi can be used in private homes,
institutions and other commercial
areas.
• Wi-Fi is expensive compared to
LI-FI.
Light Fidelity(LI-FI)
• LI-FI uses light from light emitting
diodes for transmitting information
across a network
• LI-FI can be used in electromagnetic
sensitive areas.
• LI-FI is 10 times cheaper than
Wi-fi.

15. APPLICATIONS
SMARTER POWER PLANTS
• Wi-Fi and many other radiation types are bad for sensitive areas.
• Power plants need fast, inter-connected data systems to monitor.
• LI-FI could offer safe, abundant connectivity for all areas of these sensitive
locations.

16. GAINS
• Best advantage of LI-FI Technology will be accessing internet at high speed in
those areas where optical fires are not easy to install.
• LI-FI technology can also be used to extend wireless networks at your home, office
or university.
• LI-FI Technology can also be used to control traffic conditions by placing this new
technology into the LEDs of cars.
• LI-FI can be used in electromagnetic sensitive areas such as in aircraft or nuclear
power plants, without causing interference.

17. CHALLENGES
• LI-FI technology is requires a prefect line-of-sight to transmit data.
• Other major challenge which probably could be faced by this new
LI-FI technology is, how optimally data can be transferred back to the transmitter.
• LI-FI cannot penetrate through solid objects .
• This provides data security . But apart from this this also proves as a difficulty for
data transmission.

18. COMMON USES
• Can be used in the places where it is difficult to lay the optical fiber like
hospitals. Used in operation theatres
• In traffic signals LI-FI can be used which will communicate with the LED
lights of the cars and accident numbers can be decreased.
• Thousand and millions of street lamps can be transferred to LI-FI lamps to
transfer data.
• Can be used for data transmission in aircrafts.

19. CONCLUSION
• If this technology can be put into practical use, every bulb can be used something
like a Wi-Fi hotspot to transmit wireless data.
• We will proceed towards a cleaner, greener, safer and brighter future.
• This allow internet where traditional radio based wireless isn’t allowed such as
aircraft or hospitals.

20. CREDITS & SOURCE
• The Principal (Mr.V.Dattatreya) Sriram Polytechnic College
• HOD Computer Engg. department Mr.Suresh.A.
• All the Staffs of Computer Engg. Department.
SOURCE:
• www.wikipedia.com
• www.google.com
• www.googleimages.com
• www.bbc.com

22. ANY QUERIES