Li-Fi is a wireless communication technology that uses visible light communication to transmit data at high speeds. It works by rapidly modulating LED lights to transmit digital signals. Key advantages are high speeds of up to 10Gbps, providing wireless connectivity without interfering with other devices, and ability to transmit data in areas where Wi-Fi is not allowed or possible. Main challenges are that light cannot pass through objects and developing effective bidirectional communication methods, but Li-Fi has potential to become an important complement or alternative to radio-based wireless networks in the future.

1. WELCOME

2. Content
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Introduction
History
Principal of li-fi
How li-fi Works
Real time of usage of li-fi
How it is different
wifi vs li-fi
Application
Advantages
Disadvantages
Future development
Conclusion

3. Introduction
Li-Fi, short for Light Fidelity, is a
wireless communication
technology that utilizes visible
light to transmit data.
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Li-Fi boasts impressive data
transfer speeds, theoretically
surpassing those of Wi-Fi by
several orders of magnitude,
potentially reaching gigabits per
second.
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Developed as an alternative to
traditional Wi-Fi, Li-Fi harnesses
the power of LED bulbs to enable
high-speed data transfer through
modulating light intensity
Li-Fi works by modulating the
intensity of light emitted by LED
bulbs to encode data. These
changes are then detected by
photodetectors and converted
back into digital information.
LI-FI
“Light Fideality”

4. 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 pure LiFi.
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.

5. Principal of li-fi
Heart of Li-Fi technology is high brightness LED's.
The LED bulb will hold a micro- chip that will do the
job of processing the data.
The on/off activity of LEDs enables data
transmission using binary codes.
Switching on an LED is a logical '1'; switching it off is
a logical '0'.
A light sensitive device (photo detector) receives
the signal and converts it back into original data.

6. How li-fi Works
Operational procedure is very simple, if the LED is
on, you transmit a digit 1, if its off you transmit a
digit 0.
the LED's can be switched on and off quickly, which
gives nice opportunities for transmitting data. hence
all that us required is some LEDS and a controller
that code data into those LEDs.
We have to just vary the rate at which the LEDs
flicker depending upon the data we want to encode.
Thus every light source will work as a hub for data
transmission.

7. Target Audience #1 Target Audience #2
Office
Target Audience #3
Roadways House
Real time of u s a g e of li-fi

8. Howit is different
Li-Fi technology is
based onLEDsfor the
transfer of data.
That is, the light can
belong to the invisible,
ultraviolet or the
visible part of the
spectrum.
Thetransfer of the data
can be with the help of all
kinds of light, nomatter
the part of the spectrum
that they belong.

9. Wi-fi vs li-fi

11. Used for modern medical instruments.
In aircrafts, it can be used for data transmission.
Used in petroleum or chemical plants where other
transmission or frequencies can be hazardous.
In traffic signals, LI-FI can be used which will
communicate with the LED lights of the car and
number of accidents can be decreased.
Plant monitoring wing the light reflection
properties
Location based services:- GPS
Underwater communication.
RF Spectrum relief.
Li-Fi can be used effectively in the places where
it is difficult to lay the optical fiber cable.
Application

13. Advantages
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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.
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High data transmission rates of
up to 10Gbps can be achieved.
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Since light cannot penetrate
walls, it provides privacy and
security that Wi-Fi cannot.
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Li-Fi has low implementation and
maintenance costs.

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

15. Future of li - fi
Efficient alternative to radio-based wireless.
Li-Fi is an emerging technology which is quick
and reliable.
Air waves are clogged so let' s use light
waves.
Hence, let' s proceed to Li-Fi for a
brighter, cheaper and greener future.

16. Conlusion
Overcomes the limitations of radio spectrum.
High speed of 10Gbps can be achieved.
The possibilities are numerous and can be explored further.
If this technology can be put into practical use, every bulb can be used something like a Wi- Fi
hotspot.
we will proceed toward the cleaner, greener, safer and brighter future.
This may solve issues such as the shortage of radio- frequency bandwidth.
Allows internet where traditional radio based wireless isn't allowed such as aircraft or hospitals
LI-FI is enabled by advance digital transmission technologies