Li-Fi technology uses visible light communication to transmit data wirelessly using LED bulbs and photodiodes. Professor Harald Haas pioneered Li-Fi research in 2006 and first introduced the term in 2011 by demonstrating high-definition video streaming from an LED bulb. Li-Fi uses LED bulbs modulated at high speeds to transmit data to photodiodes, allowing for wireless connectivity. It has advantages over Wi-Fi like better security, higher speed, and ability to be used in places where radio waves cannot be used. Potential applications include use in airplanes, hospitals, and underwater exploration. While Li-Fi has a limited range and cannot be used in the dark, it provides a more energy efficient and secure alternative to

1. Lifi Technology
Presented by:
SAKIL AHMED
BTech(CTIS) 5th sem
ADTU/2018-22/BTech(CTIS)/012

2. Content:-
● Introduction
● History
● How it works
● Li-Fi Vs Wifi
● Applications
● Advantages
● Disadvantages
● Conclusion

3. Introduction:-
❖ What is Li-Fi?
➢ Li-Fi is wireless communication technology which
utilizes light to transmit data between devices
➢ Full form is Light Fidelity
➢ It uses light instead of radio waves to transmit data

4. History:-
❖ Professor Harald Haas and Li-Fi
➢ Professor harald haas and his team of researchers are pioneers in the
field of Li-Fi. They began their research into Visible light communication
technology as early as 2006.
➢ The term Li-Fi was first introduced to the world in 2011 during his TED
talk. To demonstrate the capabilities of new technology, Prof. Haas
provided a live demonstration by streaming a large , high-definition
video from a standard LED bulb.

5. How it Works:-
❖ Li-Fi make use Visible light for
transmission of data
❖ A VLC(Visible Light Communication)
has two qualifying components:-
➢ At least one device containing a
photodiode in order to receive light
signals.
➢ A light source equipped with a signal
processing unit for the transmission of
signals
Video link: Demonstration and companies website

6. Li-Fi Vs Wifi
Li-Fi Wifi
Advantages: Less interference,can pass through salty More interference, cannot pass through salt sea water,
Sea water, works in dense region. Works in less dense region
Application: Used in airlines,undersea exploration, Used for internet browsing with the help of Wifi hotspots.
Operation theaters in the hospitals,
Office and home premises for data
Transfer and internet browsing.
Data density: Works in high density environments. Works in less dense environments due to interference
Related issues.
Privacy: With Li-Fi, light is blocked by walls and Wifi is less secure because the signal cannot be blocked
Hence it provides more secure data by walls and more objects.
transfer.
Covers Distance: About 10 meters About 32 meters(WLAN 802.11b/11g) varies based on
Transmit power and antenna type

7. Applications:-
★ Medical Application:-
○ As the Li-Fi uses light for transmission of data, so the Li-Fi rays are not harmful to the
human body, Therefore Li-Fi can be used in the hospital. The various medical instrument
can be made more precise and accurate by inculcation this wireless technology.
★ Airlines:-
○ The Li-Fi can be implemented in the airlines . As the airlines are as the distance where
radio frequency cannot be used due to various issues like it may interfere with the
operating system of the airplanes and cause a mishap. As Li-Fi uses light ray so can can
implemented easily inside the airplanes and it does not interfere with the OS of the
airplanes
★ Underneath the ocean:-
○ As the light rays can even travel under the water . So, Li-Fi can be used for communication
under the water. It can also be used in the submarines would provides a more secure
network inside the water. It would enhance and extend the possibility of communication

8. Advantages:-
❖ Larger bandwidth
❖ Higher efficiency
❖ High security
❖ Thousands and millions of street lamp
can be convert into Li-Fi spots
❖ Lighting point can be used as a hotspot
❖ Can be used in Airlines
❖ Green information Technology

9. Disadvantages:-
❖ Limited Range
❖ Doesn’t used in the dark
❖ Limited Compatibility
❖ Not answer to slow internet
speeds

10. Conclusion:-
❖ Overcomes the limitation of radio waves
❖ High speed of 10Gbps can be achieved
❖ If this technology can be put into practical
used every LED bulb can be used as a Li-Fi
hotspots
❖ Allows internet where traditional radio -based
wireless isn’t allowed such as aircrafts and
hospitals
❖ Li-Fi is not harmful to the human body.
❖ We will proceed towards the Greener, Safer
and Brighter future

11. THANK YOU