Li-Fi uses visible light communication and LED bulbs to deliver broadband internet and wireless connectivity. It provides higher speeds, greater capacity, and more secure access than traditional Wi-Fi. While under continued research, Li-Fi holds potential economic benefits through reduced costs compared to Wi-Fi and its ability to take advantage of LED lighting that is expected to become ubiquitous. However, challenges remain regarding external light interference and modifications needed for power grid connections and uplinks.

2. Walkthrough
 Origin of the Concept
 Introduction of Li-Fi
 Genesis
 Implementation
 Economic value of Li-Fi
 Some hotspots
 Wi-Fi vs. Li-Fi
 Future prospects
 Still under research

4. Main issues of wireless communication
 Capacity : The range of a base station is
limited.
 Efficiency : Base stations consumes a lot of
energy. They are only 5% efficient by
records.
 Availability : Radio waves are not available
everywhere.
 Security : Radio waves are intercepted as it
penetrate through walls.

5. Radio waves Visible lights

6. LED light bulb
 Light Emitting Diodes as a source of
light (releases large amount of
energy in the form of light)
 Semiconductor material (intensity
can be motivated at a very high
speed & can be switched off at very
high speed)
 Long service life (10-15 years while
usual bulbs lasts 1-2 years)
 Energy-saving (8W LED bulb
= 60W ordinary light bulb)

9. Economic value
 A free band that does not need license.
 High installation cost but very low maintenance cost.
 Cheaper than Wi-Fi.
 Theoretical speed up to 1 GB per second : Less time
& energy consumption.
 No more monthly broadband bills.
 Lower electricity costs.
 Longevity of LED bulb : saves money.
 Light doesn't penetrate through walls : secured
access.

12.  An USB Li-fi Key
designed by
OLEDCOMM for tablet.
 Li-Fi router for PC by
OLEDCOMM, a French
company.
 OLEDCOMM has
recently designed a Li-Fi
Dongle for Smartphones.

13. Li-Fi vs. Wi-Fi
 VLC is not in competition with WiFi, it is a
complimentary technology that should
eventually help free up much needed
space within the radio wave spectrum.
 You can't have a light bulb that provides
data to a high-speed moving object or to
provide data in a remote area where there
are trees and walls and obstacles behind.

14. Future Prospects
 This research report categorizes the global
VLC technology market; based on
component, applications, and geography.
 Li-Fi uses light-emitting diodes (LEDs)
which are rapidly gaining in popularity for
standard lightbulbs and other domestic
and commercial purposes. They are
expected to be ubiquitous in 20 years.

15. Still under research…
 What will be the effect of
interferences from external light
sources like sun light & normal
bulbs?
 what about the limited bandwith
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 ?