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LI-FI TECHNOLOGY and its advantages and disadvantages
Light Fidelity (Li-Fi) is a bidirectional, high-speed and fully networked wireless communication technology similar to Wi-Fi. li-fi technology ppt free download
• Light Fidelity (LiFi) is a bidirectional, highspeed
and fully networked wireless communication
technology similar to WiFi.
• LIFI is a technology that uses the light emitting
diodes to transmit the data wirelessly.
• LIFI is fast and cheap practical version of WIFI,
based on visible light communication (VLC).
• VLC is a data communication medium, which uses
the visible light between 400 Thz (780 nm) and 800
Thz (375 nm) as optical carrier for data transmissionHistory
The technology truly began during the 1990's in
countries like Germany, Korea, and Japan
where they discovered LED's could be
retrofitted to send information. Harald Haas
continues to wow the world with the potential
to use light for communication.
HE DEMONSTRATED IT IN THE YEAR
EDINBURGH, UKLifi environmentPRESENT SCENARIO
transmit 600 TB data
become an utility like
electricity and water.RADIO SPECTRUM ISSUES
Cost and Expensive
Less Bandwidth compared to other spectrums
Insufficient spectrum for increasing data
Millions of base stations consume huge amount of
1.Transmitting the radio waves
2.To cool the base station cabins
5 EfficiencyRADIO SPECTRUM ISSUES
Available within the range of Base stations
Unavailable in aircrafts
Less secure(passes through the walls)
Anyone with knowledge and bad intention can
misuse itAlternative of radio wavesWHY ONLY VLC
Radio Infrared Visible Ultraviolet
X Rays Rays
Waves Rays Rays Rays
Gama rays cant be used as they could be dangerous.
Xrays have similar health issues.
Ultraviolet light is good for place without people, but other wise
dangerous for the human body
Infrared, due to eye safety regulation, can only be used with low
HENCE WE LEFT WITH THE ONLY THE VISIBLE LIGHT
Operational procedure is very simple, if the led is on, you
transmit a digital 1, if its off you transmit a 0. The LEDs
can be switched on and off very quickly, which gives nice
opportunities for transmitting data. Hence all that us required
is some LEDs and a controller that code data into those
LEDs. We have to just vary the rate at which the LED’s .
Flicker depending upon the data we want to encode .
Thus every light source will works as a hub for data
transmission .LIFI CONSTRUCTION
The LI FI product consists of 4 primary subassemblies:
• RF power amplifier circuit (PA)
• Printed circuit board (PCB)
1. 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.
2. The PCB controls the electrical inputs and outputs of the lamp and houses the
microcontroller used to manage different lamp functions.
3. An RF (radiofrequency) signal is generated by the solidstate PA and is guided
into an electric field about the bulb.
4. All of these subassemblies are contained in an aluminum enclosureHow It Works
On one end all the data on the internet will be streamed to a
When the led is turned on, the microchip converts the digital
data in form of light.
On the other hand, this light is detected by photo sensitive
Next this device is amplified and processed and then fed to
the device.APPLICATION AREAS
Traffic lights can communicate to the
car and with each other. Cars have
LEDbased headlights, LEDbased
cack lights, and cars can
communicate with each other and
prevent accidents in by exchanging
In operation theatre, LiFi can be
used for modern medical
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 overcome this drawback
on radiowaves , lifi is introduced.APPLICATION AREAS
◎INTRINSICALLY SAFE ENVIRONMENT
It can be used in petroleum or chemical
plants where other transmission or
frequencies could be hazardous.APPLICATION AREAS
◎ON OCEAN BED
LiFi can even work underwater
were WiFi fails completely, thereby
throwing open endless opportunities
for military/navigation operations.APPLICATION AREAS
There are millions of street lamps
deployed around the world.
Each of these street lamps could be a
free access point.LIMITATIONS
There should be line of sight between sender
Visible light cannot penetrate through solid
High installation cost of the VLC systems
Interferences from external light sources like
sun light, normal bulbs, and opaque materials in
the path of transmission will cause interruption in
A major challenge facing LiFi is how the
receiving device will transmit back to transmitter.IS IT A PROVEN TECHNOLOGY
• Yes, this is already proven.
• Dr. Harald has demonstrated his invention using an
ordinary table lamp that successfully transmitted data
at speed exceeding 10 mbps.
• To prove that light bulb was the source of data stream,
he periodically blocked the beam of light, causing the
connection to drop.FUTURE OF LIFI“
In November 2014, LiFi pioneers pureLiFi joined
forces with French lighting company Lucibel aiming to
bring out LiFi enables products, by the end of 2015.
pureLiFi already have two products on the market: Li
Flame Ceiling Unit to connect to an LED light
fixture and LiFlame Desktop Unit which connects to a
device via USB, both aiming to provide light and
connectivity in one device.
Plus, with faster connectivity and data transmissionit’s an
interesting space for businesses.Continued..
LiFi is reportedly being tested in Dubai, by UAEbased
telecommunications provider, du and Zero1. Du claims to
have successfully provided internet, audio and video
streaming over a LiFi connection.
What's more, reports suggest that Apple may build future
iPhones with LiFi capabilities. A Twitter user found that
within its iOS 9.1 code there were references to LiFi
written as 'LiFi Capability' hinting that Apple may
integrate Lifi with iPhones in the future.LiFi has proven itself as a
viable, efficient and secure
The possibilities are numerous and can be explored
further. If this technology can be put into practical
use , every bulb can be used something like a WiFi
hotspots to transmit wireless data and we will be
proceed onwards the
Cleaner, Greener, safer and Brighter