ALL DETAILS ABOUT FOR LI-FI

1. Li-Fi(LIGHT FIDEALITY)

2. INTRODUCTION
• LI-FI IS A TECHNOLOGY THAT USES THE LIGHT
EMITTING DIODES(LED’S) TO TRANSMIT THE
DATA WIRELESSLY.
• IT USES VISIBLE LIGHT BETWEEN 400 THz (780
nm) and 800 THz (375 nm) AS OPTICAL
CARRIER FOR DATA TRANSMISSION

3. A LI-FI ENVIRONMENT

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

5. HOW DOES LI-FI WORKS
Its working is much simply explained as follows:
• If the LED is on, the digital 1 is transmitted.
And if it is off, the digital 0 is transmitted.
• It is possible to encode data in the light by
varying the rate at which the LEDs flicker on
and off to give different strings of 1s and 0s.
• A coder is connected at back side of these
bulbs to code data.

7. CONSTRUCTION OF LI-F
• Li-Fi product consists of 4 primary sub-
assemblies:
• Bulb
• Radio Frequency(RF) power amplifier circuit
(PA)
• Printed Circuit Board (PCB)
• enclosure

8. • The PCB controls the electric inputs and
outputs of the lamp and houses the
microcontroller used to manage different
lamp functions.
• An RF (Radio-Frequency) signal is generated
by the solid-state PA and is guided into an
electronic field about the bulb.

9. • The high concentration of energy in the
electric field vaporizes the contents of the
bulb to a plasma state at the bulb’s center;
this controlled plasma generates an intense
source of light.
• All of these sub-assemblies are contained in
an aluminum enclosure.

10. LI-FI VS WI-FI
1. Li-Fi has a High speed data transfer rate over
1Gbps
Wi-Fi has a data transfer rate of maximum
54Mbps
2.Li-fi uses visible part of electromagnetic
spectrum while Wi-fi uses radio wave portion
of electromagnetic spectrum

12. Applications
• Airways
• Green information technology
• Free from frequency bandwidth problem
• Increase communication safety
• Multi user communication
• Lightings points used as hotspot
• Smarter power plants
• Under sea Awesomeness

13. Advantages
• Can be safely used on plains because it does not
interfere with radio equipments.
• Li-Fi never gives side effect on any living thing .
• It does not require any band width spectrum.
• Due to visual light communication, the node or
terminal attach to our network is visible to host
of network.
• Li-Fi supports the broadcasting of network.
• Any lightings device is performed as a hotspot.

14. • We can achieve maximum internet speed upto
150Gbps.
• Mostly powered by LEDs so it is cost efficient
• Transmission of data is fast and easy.

15. Disadvantages
• Presence of light is essential
• There should be line of sight
• Works better with fluorescent light and LEDs
but very low efficiency with bulbs