Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. One key advantage is that Li-Fi has a bandwidth that is 10,000 times greater than conventional radio wave Wi-Fi. It works by varying the rate at which LEDs flicker on and off to encode data in the light. Potential applications include using street lamps to transmit data at incredibly high speeds, providing internet on aircraft, and improving connectivity in industrial settings. While Li-Fi requires line of sight and only functions where light is present, it could offer a more efficient and secure alternative to radio-based wireless networks as demand for wireless connectivity increases.

1. Submitted By
Sandeep Kumar
Reddy
13KB1D3808

2. Contents
History
Introduction
Features
Working process
Issues Regarding Radio Spectrum
Applications
Advantages
Disadvantages
Conclusion

3. History
One germen phycist. Harald Haas has come up with a
solution he calls “data through illumination” –by sending
data through an LED light bulb that varies in intensity
faster than the human eye can follow. He had coined the
term Li-Fi firstly in TED Global talk conference in UK
on VLC. Haas says his invention, which he calls DLIGHT, can produce data rates faster than 10 megabits per
second.

4. Introduction
Li-Fi means “Light Fidelity”.
At the heart of this technology is a
new generation of a high brightness light
emitting diode.
It is possible to encode data in the
light by varying the rate at which the
LED’s flickeron and off to give different
strings of 1’s and 0’s

5. It’s Features
 Li-Fi technology is based on LEDs for the
transfer of data.
 The transfer of the data can be with the help
of all kind of light i.e Light may be Invisible,
Ultraviolet or Visible part of spectrum.
 The speed of the internet is incredibly high
and the user everything in just a few minutes.

6. Working

7. Electro Magnetic Spectrum

8. Issues Regarding Radio Spectrum

9. Capacity
 Radio Waves
 Cost and expensive
 Less Band Width
Availability
 Available with in the base stations
 Limited availability
 Unavailable in air crafts

10. Efficiency
 Million of Base Station consume huge amount
of energy for transmitting the radio waves.
 5% efficiency.
Security
 Less Secure(passage through walls)

11. Applications
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Used for modern medical instruments.
Used in petroleum or chemical plants
where other transmission or frequencies
could be hazardous.
Thousands and millions of street lamps can
be transferred to Li-Fi lamps to transfer
data.
In Aircrafts.

12. Applications in Industries

13. Applications in Aeroplanes

14. Advantages of LI-FI
 It is possible to achieve more than 10Gbps,
theoretically allowing a high-definition film to be
downloaded in 30sec.
 Mostly powered by LEDs so it is cost efficient.
 Transmission of data is fast and easy.
 Its main advantage is it’s Bandwidth is 10,000
times than the radio waves.

15. Disadvantages
 Presence of light is essential.
 There should be line of sight
 Works better with fluorescent light and LEDs
but very low efficiency with Bulbs.

16. Conclusion
The concept of Li-Fi is currently attracting
a great deal of interest, not least because it may
offer a genuine and efficient alternative to radiobased wireless. As a growing number of people
and their devices access wireless internet, the air
waves are becoming increasingly clogged,
making it more and more difficult to get a
reliable, high-speed signal. So Li-Fi has a bright
future.