1. LI-FI TECHNOLOGY
K.SRAVANTHI REDDY
3rd YEAR
BRECW

2.  INTERNET SERVICES ARE VERY HIGHLY DEMANDING AND
ESSENTIAL ACCESSORIES IN CURRENT SITUATION.
PRESENTLY WE ARE USING WIRED NETWORKS AND MOSTLY
WI-FI IN OUR HOUSES,SHOPS AND AROUND 10-100 METER
DISTANCES TO CONNECT OUR P.C.,LAPTOPS.
INTRODUCTION:

3. 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.

4. ISSUE WITH RADIO WAVES:

6. WHY ONLY VLC

7. TRANSMITTING RECEIVING
ELEMENTS ELEMENTS
(DETECTOR)
LED
FLUORE
SCENT
LAMP
AVALANCHE
PHOTO DIODE
IMAGE
SENSORS

8. HOW IT WORKS:

9. 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.

11. DIFFERENCE BETWEEN TECHNOLOGIES

12. ADVANTAGES:
 LARGER BANDWIDTH(10,000 TIMES THE RADIO
BANDWIDTH)
 HIGH EFFICIENCY
 MORE AVAILABILITY
 HIGHLY SECURE
DISADVANTAGES:
CONNECTIVITY WHILE MOVING
DIMMING
SHADOWING

13. APPLICATIONS:
HOSPITALS (IN FEW IN AIRCRAFT CABINS
MEDICAL INSTRUMENTS)

14. IN VEHICLES AND TRAFFIC LIGHTS, REDUCING
ACCIDENTS AND TRAFFIC CONGESTION

15. IT WILL REDUCE YOUR
ELECTRICITY BILL AND ON OCEAN BEDS
MAINTAINANCE BILL

16. STREET LAMPS (AS FREE ACCESS POINTS)

17. 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.