LI-FI TECHNOLOGY

K.SRAVANTHI REDDY

3rd YEARBRECW

INTERNET SERVICES ARE VERY HIGHLY DEMANDING AND ESSENTIAL ACCESSORIES IN CURRENT SITUATION.

PRESENTLY WE ARE USING WIRED NETWORKS AND MOSTLYWI-FI IN OUR HOUSES,SHOPS AND AROUND 10-100 METER DISTANCES TO CONNECT OUR P.C.,LAPTOPS.

INTRODUCTION:

WHAT IS LI-FI?

LI-FI IS TRANSMISSION OF DATA THROUGH

ILLUMINATION, ie SENDING DATA THROUGH A LED LIGHT BULB THAT VARIES IN INTENSITY FASTER THAN

HUMAN EYE CAN FOLLOW. LI-FI CAN BE THOUGHT OF AS A LIGHT BASED WI-FI. INSTEAD OF WI-FI MODEMS LI-FI WOULD USE TRANSC

RECEIVER-FITTED LED LAMPS THAT

CAN LIGHT A ROOM AS WELL AS

TRANSMIT AND RECEIVE

INFORMATION.

ISSUE WITH RADIO WAVES:

WHY ONLY VLC

TRANSMITTING RECEIVING ELEMENTS ELEMENTS (DETECTOR)

LED

FLUORESCENT LAMP

AVALANCHE PHOTO DIODE

IMAGE SENSORS

HOW IT WORKS:

WORKING:

AN OVERHEAD LAMP FITTED WITH AN LED WITH SIGNAL-PROCESSING TECHNOLOGY STREAMS DATA EMBEDDED IN ITS BEAM AT ULTRA HIGH SPEEDS TO THE PHOTO DETECTOR.A RECEIVER DONGLE THEN CONVERTS THE TINY CHANGES IN AMPLITUDE INTO AN ELECTRICAL SIGNAL,WHICH IS THEN CONVETED BACK INTO A DATA STREAM AND TRANSMITTED TO A COMPUTER OR MOBILE DEVICE.

IF LED IS ON ,TRANSMITS A DIGITAL 1,IF ITS OFF TRANSMIT A 0.THE LEDs CAN BE SWITCHED ON AND OFF VERY QUICKLY,WHICH GIVES NICE OPPORTUNITTES FOR TRANSMITTING DATA.

THUS EVERY LIGHT SOURCE WILL WORK AS A HUB FOR DATA TRANSMISSION.

DIFFERENCE BETWEEN TECHNOLOGIES

ADVANTAGES:

LARGER BANDWIDTH(10,000 TIMES THE RADIO BANDWIDTH)

HIGH EFFICIENCY MORE AVAILABILITY HIGHLY SECURE

DISADVANTAGES:CONNECTIVITY WHILE MOVINGDIMMINGSHADOWING

APPLICATIONS:

HOSPITALS (IN FEW IN AIRCRAFT CABINS

MEDICAL INSTRUMENTS)

IN VEHICLES AND TRAFFIC LIGHTS, REDUCING ACCIDENTS AND TRAFFIC CONGESTION

IT WILL REDUCE YOUR ELECTRICITY BILL AND ON OCEAN BEDSMAINTAINANCE BILL

STREET LAMPS (AS FREE ACCESS POINTS)

CONCLUSION:

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

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 HOTSPOTS TO TRANSMIT WIRELESS DATA.

THANK YOU