(Light Fidelity)

PRESENTED BY MANISHA KUMARI (13697) NEHA SINGH (13713)

Introduction Issues regarding RADIO

WAVES Why VLC ?Components Block diagram Working Application sAdvantagesLimitation o ConclusionReferences'

CONTENT

INTRODUCTION

What is exactly ?

Harald Haas in TED Global Talk

If led is on , then we transmit a digital signal 1,

and if the led is off , then we transmit a digital signal 0.

Capacity

security

EfficiencyAVAILABILITY

ISSUES REGARDING RADIO WAVES

WHY VLC ??

RADIO WAVE

INFRA RED

VISIBLE LIGHT

UV-RAYS

X–RAYS

GAMA RAYS

Expensive , Limited & Less Secure

It is not used generally

used in hospitals

Harmful for human body

IIt is not used due to eye safety regulation

It is not harmful for human beings & available every where easily

COMPONENTS OF LI-FI LI FI consist of 4 elements : 1) bulb 2)RF power Amplifier (PA) 3)Printed circuit board(PCB) 4)Enclosure

TRANSMITTING ELEMENT

RECEVING ELEMENT

Avalanche Photo Diode

Image Sensors

BLOCK DIAGRAM

DATA

MODULATION

LIGHT

SOURCE

Data Demodulation(PPM/FSK)

Photo

Detector

BLOCK DIAGRAM

TRANSMITTI

NG SIGNAL

RECEVING SIGNALS

PROPAGATE

Potential Application Area

IN AIRCRAFT CABIN

IN PETROCHEMICAL INDUSTRIES

IN HOSPITALS NNIII

IN TRAFFIC

UNDER WATER

In home , offices & schools

ADVANTAGES::

DISADVANTAGELight can not pass through opaque objects

Interference from external source like sun light, normal bulbs opaque materialsHigh installation cost of VLC

CONCLUSION

“WITH ITS MAGIC OF LIGHT IT CAN MAKE OUR WORLD A GREENER ,SAFER CLEANER AND MOREOVER A BRIGHTER PLACE TO LIVE.”

REFERENCESS :

http://www.slideshare.net/tanshu9871/ppt-on-lifi-technology?related=2 Harald Haas,‘Wireless data from every light bulb’, TED Global, Edinburgh, July 2011http://www.oledcomm.comhttp://purelifi.comhttp://www.lificonsortium.org

THANK

YOU