latest technology

2. GENESIS OFLI-FI
Harald Hass, a professor at the University of
Edinburgh who began his research in the
field in 2004, gave a debut demonstration of
what he called a Li-Fi prototype at the
TEDGlobal conference in Edinburgh on 12th
July 2011.

3. WHAT IS LI-FI?
Li-Fi is the transmission of data through
illumination by taking the fiber out of fiber
optics by sending data through a LED light
bulb.
This varies in intensity faster than human
eye can follow.
It is the fast and
communication system
cheap
which is
wireless
optical
which is optical version of the Wi-Fi.

4. HOWLI-FIWORKS..
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.

6. CONSTRUCTION OFLI-FI..
primary sub-Li-Fi product consists of 4
assemblies:
Bulb
RF power amplifier circuit
(PA)
Printed Circuit Board (PCB)
enclosure

7. CONSTRUCTION OFLI-FI
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.

8. CONSTRUCTION OFLI-FI
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. COMPARISON BETWEEN LI-FI & WI-FI..
Li- Fi is a term of one used to describe
visible
applied
light communication
to high speed
technology
wireless
communication.
It acquires this name due to the similarity to
Wi-Fi, only using light instead of radio.

11. COMPARISON BETWEEN LI-FI & WI-FI..
Wi-Fi is great for general wireless coverage
within buildings and Li-Fi is ideal for high
density wireless data coverage in confined
area and for relieving radio interference
issues, so the two technologies can be
considered complimentary.

12. COMPARISON BETWEEN LI-FI & CURRENT
TECHNOLOGY..
Speed DataTechnology
density
Wireless (current)
Wi-Fi-IEEE 150Mbps *
802.11n
Bluetooth 3Mbps *
IrDA 4Mbps ***

13. COMPARISON BETWEEN LI-FI & CURRENT
TECHNOLOGY..
Speed DataTechnology
density
Wireless (future)
Wi-Gig 2Gbps **
Giga-IR 1Gbps ***
Li-Fi 1Gbps ****

14. HOW LI-FI IS DIFFERENT?
Li-Fi technology is based on LEDs for the
transfer of data.
The transfer of the data can be with the help of
all kind of light i.e., Light may be Invisible,
Ultraviolet or Visible part of spectrum.
The speed of the internet is incredibly high
and the user everything in just a few
minutes.

16. APPLICATION AREA OF LI-FITECHNOLOGY:
applications of Li-Fi are givenSome of the
below:
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

17. USES ONAPPLICATIONS:
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 VLC, the node or terminal attach to
our network is visible to host of network.
Li-Fi supports the broadcasting of
network.

18. USES ONAPPLICATIONS:
Li-Fi could offers safe, abundant
connectivity for all various of sensitive
locations.
Can be used underwater without radio
interference because salt conducts
electricity.

19. ADVANTAGES OFLI-FI..
It is impossible to achieve more than
10Gbps, theoretically allowing a high-
definition film to be downloaded in 30 sec.
Mostly powered by LEDs so it is cost
efficient
Transmission of data is fast andeasy.

20. DISADVANTAGES OFLI-FI..
Presence of light isessential
There should be line ofsight
Works better with fluorescent light and
LEDs but very low efficiency with bulbs

21. CONCLUSION
The concept of Li-Fi is currently
attracting a great deal of interest, not
least because it may offer a genuine and
efficient alternative to radio-based
wireless.
As a growing number of people and their
devices access wireless internet, the air
waves are becoming increasingly
clogged, making it more and more
difficult to get a reliable, high-speed
signal.