LI-FI (LIGHT FEDELITY)

CONSTRUCTION & WORKING OF LI-FI

ж Li-Fi is implemented using white LED light bulbs at downlink transmitter. ж By fast variations of the current, optical output can be made to vary at extremely

high speeds. ж An overhead lamp fitted with an LED with signal processing technology streams

data embedded in its beam at ultra high speeds to the photodiodes. ж A receiver dongle then converts the tiny changes in amplitude into an electrical

signal, which is then converted back into a data stream & transmitted to a computer or mobile device.

CONSTRUCTION &WORKING OF LI-FI(Continued….

COMPARISON BETWEEN LI-FI & WI-FI

FUTURE APLLICATIONS In vehicles and traffic lights,reducing traffic accidents

and traffic congestion

In Aeroplanes’ and Under water

In Hospitals

Street Lamps(as free access points)

Petroleum and Chemical Industries

Availability Efficiency Harmless

High Security Ease of

useFast Data Transfer

Low Cost

ADVANTAGES

What will be the effect of interferences from external light sources like sun light & normal bulbs?What about the limited bandwidth of the existing copper cables used for electrical connections?Where do the connections uplink, how serious are the modifications needed to the power grid?How will other devices react if you inject a high frequency into mains?Initial setup cost.Presence of light is essential.There should be line of sight.

Drawbacks and ongoing research of LI-Fi Technologies:

LI-FI GADJETS

YES THIS ALREADY PROVEN.

HARALD HAAS DEMONSTRATED HIS INVENTION USING AN ORDINARY TABLE LAMP THAT SUCCESSFULLY TRANSMITTED DATA AT SPEEDS EXCEEDING 10Mbps USING LIGHT WAVES FORM LED LIGHT BULBS TO A COMPUTER LOCATED BELOW THE LAMP.TO PROVE THAT THE LIGHT WAS THE SOURCE OF THE DATA STREAM HE PERIODICALLY BLOCKED THE BEAM OF LIGHT , CAUSING THE CONNECTION TO DROP.

Is this a proven technology?