Light Fidelity (Li-Fi) is an optical wireless communication technology that uses light emitting diodes (LEDs) to transmit data, offering data transfer rates over 1 Gbps, significantly higher than Wi-Fi. Developed by Harald Haas in 2012, Li-Fi has various applications in areas such as healthcare, aviation, and mobile connectivity, and promises a cleaner, greener future by alleviating the congestion of radio-frequency bandwidth. The technology leverages visible light communication (VLC) and utilizes existing lighting infrastructure to facilitate efficient data transmission.

1. LIGHT FIDELITY(LI-FI)
K.B.MAHESH KUMAR K.R.SHYAM
114P1A0453 114P1AO438
ELECTRONICS AND COMMUNICATION ENGINEERING
YOGANANDA INSTITUTE OF TECHNOLOGYAND SCIENCES
MOHAN REDDY NAGAR, ELAMANDYAM (V), RENIGUNTA (M), TIRUPATI.

2. CONTENTS
• INTRODUCTION
• HISTORY
• CONSTRUCTION
• LI-FI VS WI-FI
• WORKING
• GIGA SPEED TECHNOLOGIES
• APPLICATIONS
• FUTURE DEVELOPMENTS
• CONCLUSION

3.  Li-fi MEANS “LIGHT FIDELITY”.
 Li-fi IS FAST AND CHEAP OPTICAL VERSION OF WI-FI.
 Li-fi IS A TECHNOLOGY THAT USES THE LIGHT EMITTING DIODES (LED) TO
TRANSMIT THE DATA WIRELESSLY.
 Li-fi BASED ON VISIBLE LIGHT COMMUNICATION (VLC).
 VLC IS A DATA COMMUNICATION MEDIUM, WHICH USES THE VISIBLE LIGHT
BETWEEN 400 THz (780 nm) and 800 THz (375 nm) AS OPTICAL CARRIER FOR
DATA TRANSMISSION.
INTRODUCTION

4.  This technology was invented by German Physicist
“HARALD HASS”, from the university of Edinburgh,
U.K.
 He demonstrated it in the year 2012.
UNIVERSITY OF EDINBURGH:
HISTORY

5. The Li-Fi product consists of three primary sub-assemblies:
• Emitter (including bulb).
• RF Driver.
• Power supply.
LIFI CONSTRUCTION

6.  At the heart of LIFIis the bulb sub-assembly where a sealed bulb is embedded in a dielectric
material.
 The dielectric material serves two purposes:
1) waveguide
2) Electric field
FUNCTION OF THE BULB ASSEMBLY

7. RF DRIVER
 Power amplifier (PA) assembly that uses an LDMOS
device.
 Converts electrical energy into RF power.
 The PA is designed for ruggedness and efficiency.
 The RF driver also contains controls circuit for digital
and analog lighting controls.

8. Capacity Availability
Efficiency Security
ISSUES REGARDING RADIO SPECTRUM

9. LI-FI VS WI-FI
• Wi-Fi has a data transfer rate of
maximum 54Mbps
• Li-Fi has a High speed data transfer rate
over 1Gbps.{1024 Mbps}
• WIFI USES THE RADIOWAVE
PORTION OF THE EM.
• LI-FI USES THE VISBLE LIGHT PORTION
OF THE EM.

10. WHY ONLY VLC?
 IR WAVES ARE HARMFUL FOR OUR EYES HENCE CAN’T BE USED.
 GAMMA RAYS ARE RADIOACTIVE AND ARE DANGEROUS.
 UV RAYS ARE HARMFUL FOR OUR SKIN AND CANNOT BE USED FOR LONG DURATION.
 X-RAYS ALSO HAS SIMILAR HEALTH ISSUES.

11. PARALLEL TO SERIAL DATA CONVERSION

12. WORKING

13. STEPS INVOLVED IN THE WORKING
STEP-1 STEP-3STEP-2

14. (a) GigaDock (b) GigaBeam
(c) GigaShower (d) GigaMIMO
GIGA-SPEED TECHNOLOGIES

15. CONTENT EXCHANGE THROUGH LI-FI

16. Capacity:
 10000 times more spectrum than RADIO WAVES.
 Light boxes are already present, so infrastructure is available
already and installed.
Availability:
 Light is present everywhere.
 Data is present where light is present
Efficiency:
 Highly efficient because LED consumes less energy
ADVANTAGES OF LI-FI

17.  RF Spectrum Relief  Smart Lighting Mobile Connectivity
 Hazardous Environments Hospital & Healthcare
 Aviation Underwater Communications Vehicles & Transportation
 Location Based Services (LBS)
APPLICATIONS
Li-Fi has found its applications in many fields. Some of them are given below:

18. FUTURE DEVELOPMENTS
 The concept of Li-Fi is currently attracting a great
deal of interest.
 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.
 So lets proceed to LI FI for a brighter and greener
future.

19. 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 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.

20. REFERENCES
 http://en.wikipedia.org/wiki/Li-Fi
 seminarprojects.com/s/seminar-report-on-Li-Fi
 http://teleinfobd.blogspot.in/2012/01/what-is-lifi.html
 technopits.blogspot.comtechnology.cgap.org/2012/01/a-lifi-world
 www.lificonsortium.org
 the-gadgeteer.com/2011/08/LI-FI

21. ANY QUESTIONS?

22. THANKING YOU