A Presentation on

LI-FI TECHNOLOGY

Syed Ibad NaumanBy

CONTENTS INTRODUCTION TO LIFI HOW DOES IT WORKS? COMPARISON WITH WI-FI 4 ISSUES WITH RADIOWAVE ALTERNATIVE FOR RADIO WAVE APPLICATION OF LI-FI IS IT A PROVEN TECHNOLOGY?

INTRODUCTION TO LI-FI

LI-FI IS A TECHNOLOGY THAT USES THE LIGHT EMITTING DIODES TO TRANSMIT THE DATA WIRELESSLY.

LI-FI IS FAST AND CHEAP OPTICAL VERSION OF WI-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

A LI-FI ENVIRONMENT

WHO INVENTED IT ?

• THIS TECHNOLOGY WAS INVENTED BY GERMAN PHYSICIST HARALD HAAS , FROM THE UNIVERSITY OF EDINBURGH ,U.K .

• HE DEMONSTRATED IT IN THE YEAR2012.`

HOW DOES LI-FI WORKS?

• THE HEART OF THIS TECHNOLOGY IS A NEW GENERATION HIGH BRIGHTNESS LED’S.

• THESE LED’S VARIES IN INTENSITY (THAT IS GETS ON AND OFF) SO FAST THAT A HUMAN EYE CANNOT DETECT IT.

• IF LED IS ON , THEN WE TRANSMIT A DIGITAL SIGNAL 1,AND IF THE LED IS OFF , THEN WE TRANSMIT A DIGITAL SIGNAL 0.

• A CONTROLLER IS CONNECTED AT THE BACK SIDE OF THESE LED BULBS TO CODE DATA TO THESE LED’S.

ISSUES WITH RADIO WAVE

• CAPACITY

WITH THE ADVENT OF NEW TECHNOLOGIES LIKE 3G ,4G WE ARE RUNNING OUT OF SPECTRUM.

THAT’S WHY RADIO WAVES ARE NOW BECOMING EXPENSIVE.

EFFICIENCY THERE ARE 1.4 MILLIONS CELLULAR

RADIO BASE STATIONS . EFFICIECY OF EACH BASE STATION IS

JUST 5%. MOST OF THE ENERGY IS NOT USED

FOR TRANSMISSION BUT RATHER FOR COOLING DOWN THE BASE STATION.

SECURITY RADIO WAVES CAN PENETRATE THROUGH WALLS AND

HENCE CAN BE INTERCEPTED. ANYONE WITH KNOWLEDGE AND BAD INTENTION CAN

MISUSE IT.

AVALILABLITY WE HAVE TO SWITCH OFF MOBILES IN AIRCRAFTS. IT IS ALSO NOT ADVISABLE TO USE MOBILES AT PETROL

PUMPS.

ADVANTAGES OF LI-FI

YOU CAN USE LI-FI IN HOSPITALS AND AIRCRFTS ALSO.

CHEAPER THEN WIFI , SINCE VISIBLE LIGHT SPECTRUM IS A FREE SPECTRUM BAND.

NO LICENSE NEEDED. THOUSANDS AND MILLIONS OF STREET

LAMPS CAN BE COVERTED TO LI-FI SPOTS.

Electromagnetic Spectrum

How Li-Fi Works ?

Li-Fi vs Wi-Fi

Li-Fi

ANY QUERIES…..

Li-Fi

THANK YOU