Lifi - Light Fidelity for ready to go and Conceptual Knowledge

1. Li-Fi Technology
It’s from future
Presenter Rohit Jain

2. Contents :-
• Introduction
• History
• How it work
• Lifi over Wifi
• Pros and cons

3. Light Fidelity
• Li-Fi is a wireless optical networking technology that uses light-emitting
diodes (LEDs) instead of radio-waves for data transmission.
• Transceiver fitted LED lamps acts like Wi-Fi modems
• LED lamps can light a room as well as transmit-receive information

4. History
 Professor Harald Haas ,from the University of Edinburgh in the UK, is
widely recognized as the original founder of Li-Fi.
 It’s initially start in 1998 but it known to public in October 2011.

5. Need of LiFi
• Radio spectrum is congested, but the demand for wireless data doubles
each year
• Issues regarding radio spectrum, such as capacity, availability, efficiency,
security are solved using LIFI.
• Speed of data transmission can be increased.

6. • Operational procedure is very simple. If LED is ON, digital
data ‘1’ is transmitted & if LED is off then ‘0’ is transmitted.
• LEDs varies in intensity so fast that a human eye cannot detect it
• A controller connected at the back side of these LEDs is used to
code data.
• Also called as 5G optical communication.
How it work

7. Radio
Waves
Infrared
Rays
Visible
Rays
Ultraviolet
Rays
X- Rays
Gama Rays
 Gama rays cant be used as they could be dangerous.
 X-rays have similar health issues.
 Ultraviolet light is good for place without people, but other wise
dangerous for the human body.
 Infrared, due to eye safety regulation, can only bse used with
low power.
HENCE WE LEFT WITH THE ONLY THE VISIBLE - LIGHT
SPECTRUM.
Why use VLC

8. Wi-Fi vs Li-Fi

9. Applications
Li-Fi Can Be Used :-
• Underwater applications where radio waves cannot propagate.
• Industries like petrochemical plants, nuclear power plants ,
petrol pumps etc.
• Sensitive areas like aircraft and Airplanes.

10. Advantages
• Data Rate is greater than 1 Gbps
• Average Cost is Low as LED is used
• Can be used anywhere, even in RF restricted areas, Since light waves will not
interfere with radio waves.
• As light waves cannot penetrate through walls, the data cannot be intercepted,
Thus provides secured communication.
• A better and efficient over radio waves.

11. Disadvantages
• Light can’t pass through objects or walls
• Short Range.
• 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.
• Presence of light necessary.

12. Conclusion
Thus, if Li-Fi technology can be put into practical use, every bulb can be
used as an alternative to Wi-Fi hotspots. It provides simple, faster and
efficient wireless data communication. Li-Fi will make us to proceed
towards the cleaner, greener, safer and brighter future.