li fi technology

1.  BY-ANOOP KUMAR
 E.C. (B.TECH) IIIrd year
 A.I.T.M.
Li Fi (Light Fidelity)
PERSENTATION ON

2.  Introduction
 History
 Present scenario
 Woking process & principle
 Li-Fi vs Wi-Fi
 Applications
 Challenges for Li-Fi
 conclusion

3. What is Li-Fi ?
Light-Fidelity
LiFi is a wireless optical networking
technology that uses light-emitting
diodes (LEDs) for data transmission.

4.  LiFi data is transmitted
by the LED bulbs and
received by
photoreceptors.

5.  The technology truly began during the 1990’s in
country like Germany,Korea and Japan where they
dicovered LED’S could be retrofitted to send
information. Harald Haas continues to wow the
world with the potential to use light for
communication.
 Professor Harald Haas, from the
University of Edinburgh in the UK,
is widely recognised as the original
founder of Li-Fi.

7.  Radio spectrum is congested but the demand for wireless
data double each year. Every thing, it seems want to use
wireless data but the capacity is drying up.

8.  Issue regarding radio spectrum
Capacity
Efficiency Security
Availability

9. used for Is not
hospitals generally used
Expensive, Is not used so far, due to
Limited BW, Safe to use, Good for use, harmful effect
Less secure Large BW but dangerous for
low power applications
due harmful for eyes
Radio
waves
Infra red visible ultravoilet X-rays Gamma rays
human body

10. WHO CAN REPLACE
RADIO WAVES FOR
WIRELESS
COMMUNICATION ..?

11. LIGHT-FIDELITY

12.  Operational procedure is very simple, if led is on, you
transmit a digital 1, if off you transmit 0. the LEDs can be
switched on and off very quickly, which gives nice
opportunities for transmitting data. Hence all that we require
some LEDs and controller that code data into these LEDs
 Thus every light source will work
as a hub for data transmission.

14.  On one end all data on the internet will be
streamed to a lamp driver when the led is turned
on the microchip converts the digital data in form
of light.
 A light sensitive device(photo detector) receives the
signal and convert it back into original data. This
method of using rapid pulses of light to transmit
information wirelessly is technically referred as
Visible Light Communication (VLC).

15. Wi-Fi 150 Mbps
Bluetooth 3 Gbps
IrDA 4 Gbps
Fire wire 800 Mbps
USB 3.0 5 Gbps
Thunderbolt 20 Gbps
Wired
Wireless(Current)
Wireless(Future)
Li-Fi 10 Gbps
Giga-IR 1 Gbps
Wi-Gig 2Gbps
Comparison between Various Technologies

17.  Li Fi technology is still in its infancy. However some area
where it seems perfectly applicable.
1. TRAFFIC LIGHT
Traffic light can communicate to
The car with each other. Cars have
LED-based cack lights, and car can
Communicate with each other and
Prevent accident in by echanging
Information.

18. 2.Intrinsically Safe Enviromnet :
Visible Light is more safe than RF hence it can be
used in plces where RF cant be used as
petrochemical plants.

19. 3. Airlines:
 Whenever we travel through airways we face the
problem in communication media because the
whole airways communication are performed on
the basis of radio waves to over come this
drawback on radioways li-fi is introduced.

20. 4. On ocean beds:
 Li-Fi can even work underwater were wi-fi
fails completely, thereby throwing open
endless opportunities for military/navigation
operations.

21. 5. Street Lamps(as free access points):
There are millions of street lamps deployed
around the world and each of these street
lamps could be used as a free hotspots.

22.  Light can’t pass through objects.
 Interference from external light source like
sun light, normal bulbs, opaque material in
the path of transmission will cause
interruption in communication.
 Li-Fi requires line of sight.
 High installation cost of the VLC Systems.

23.  The possibilities are
numerous and can be
explored further. If this
technology can be put in to
practical use, every bulb can
be used something like a wi-
fi hotspot to transmit
wireless data.
The Future of wireless communication is LI-FI

24. Li-Fi: the next generation wireless communication