LIGHT FIDELITY (LI-FI)

K.B.MAHESH KUMAR K.R.SHYAM 114P1A0453 114P1AO438

ELECTRONICS AND COMMUNICATION ENGINEERINGYOGANANDA INSTITUTE OF TECHNOLOGY AND SCIENCES

MOHAN REDDY NAGAR, ELAMANDYAM (V), RENIGUNTA (M), TIRUPATI.

CONTENTS

• INTRODUCTION

• HISTORY

• CONSTRUCTION

• LI-FI VS WI-FI

• WORKING

• GIGA SPEED TECHNOLOGIES

• APPLICATIONS

• FUTURE DEVELOPMENTS

• CONCLUSION

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

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

The Li-Fi product consists of three primary sub-assemblies:

• Emitter (including bulb).

• RF Driver.

• Power supply.

LIFI CONSTRUCTION

At the heart of LIFI is 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

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.

Capacity

Availability

Efficiency

Security

ISSUES REGARDING RADIO SPECTRUM

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.

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.

PARALLEL TO SERIAL DATA CONVERSION

WORKING

STEPS INVOLVED IN THE WORKING

STEP-1 STEP-3STEP-2

(a) GigaDock (b) GigaBeam

(c) GigaShower (d) GigaMIMO

GIGA-SPEED TECHNOLOGIES

CONTENT EXCHANGE THROUGH LI-FI

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

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:

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.

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.

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

ANY QUESTIONS?

THANKING YOU