The Li-Fi

The Li-FiLight-Fidelity

ELHAOUARI Yassine - BACHE Kevin 1

Summary

What is Li-Fi ?

History of Li-Fi

Specifications of Li-Fi

Conclusion


What is Li-Fi ?


LI-FI STANDS FOR LIGHT FIDELITY AND LI-FI IS TRANSMISSIONTECHNOLOGY OF DATA THROUGH ILLUMINATION.

LED BULB VARIES IN INTENSITY FASTER THAN THE HUMAN EYE CANFOLLOW.

LI-FI IS A TECHNOLOGY THAT USES THE LIGHT EMITTINGDIODES TO TRANSMIT THE DATA WIRELESSLY.

LI-FI IS FAST AND CHEAP OPTICAL VERSION OF WI-FI BASED ONVISIBLE LIGHT COMMUNICATION (VLC).

History of Li-Fi

1- The beginnings

A German physicist Dr. Harald Haas, has started working on transmission of data using visible light back in 2004.

In the year 2011 he first introduced to the world this new technology, LI FI in the TED talk show.

He envisions a future where data for laptops and other mobile devices is transmitted through a light in a room.


History of Li-Fi

2- Radio Waves Issues

Capacity : Radio waves are limitted, scarce and expensive and we only have certain range of it.

Efficiency : Too many eadio bases station that consume massive amount of energy.

Availabality : Can not be used on airplanes and under water.

Security : Penetrates through walls and can be intercepted.



1- Alternative to Radio Waves in Electromagnetic spectrum



2- Li-Fi construction

The LiFi product consists of 4 primary sub-assemblies:

1. Bulb

2. Printed Circuit Board (PCB)

3. Radio Frequencey Power Amplifier Circuit (PA)

4. Enclosure



3- How it work ?



4- Advantages of Li-Fi

Capacity :10000times more spectrum than Radio waves.

Efficiency : Data through illumination and thus data transmission comes for free.

Availabality :There Are An Estimated 14 Billion Light Sources On Earth And Each Can Be Easily

Converted Into A Li-Fi Hotspot.

Security : Light waves doesn’t penetrate through walls. Can’t be intercepted.



5- Limitations of Li-Fi

Visible light can not penetrate solid object

Hight installation cost of the VLC

Interferences from external light sources

Interference with other electromagnetic waves



6- Applications of Li-Fi

Can be used in the places where it is difficult to lay the optical fiber

In aircraft Li-Fi can be used to transmit data

Li-Fi can be used for modern medical instruments

.In traffic signals Li-Fi can be used


Conclusion

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 Wi-Fi hotspot to transmit wireless

data and we will proceed onwards the

Cleaner, Greener, Safer and Brighter future.


Thank You All!

The Li-Fi

Technology

data lifi

fi specifications of

lifi hotspot

lifi construction

aircraft lifi

limitations of li

fi capacity

advantages of li