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Akshay Wani Mrs.Bhagyashri More

WHAT IS LI – FI ?
 LI-FI is transmission of data through illumination
,sending data through a LED light bulb that varies in
intensity faster than human eye can follow

HISTROY
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
HARALD HASS

PRESENT SCENARIO
 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.
 So what can carry this excess demand in the future .

Issues regarding Radiospectrum

Capacity
 Radiowaves
 Cost and Expensive
 Less Bandwidth compared to other spectrums
 Insufficient spectrum for increasing data
Efficiency
 Millions of basestations consume huge amount of energy
for
1.Transmitting the radio waves
2.To cool the base station cabins
 5% Efficiency

Availability
 Available within the range of Base stations
 Limited availabity
 Unavailable in aircrafts
Security
 Less secure(passes through the walls)

How LI-FI Works ?
 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.

Infrared rays in Remote control
•Single data stream
•20000 bits per second
•Not usable for vedio streaming

Difference Between The
Technologies

POTENTIAL APPLICATION OF LI-FI
Li Fi technology is still in its infancy .However some areas where it seems
perfectly applicable are:-
 TRAFFIC LIGHTS
 Traffic lights can communicate to the car and with each other.
Cars have LED-based headlights, LED-based cack lights, and
cars can communicate with each other and prevent accidents in
by exchanging information.

In vehicles and traffic lights,reducing accidents and
traffic congestion

 INTRINSICALLY SAFE ENCIRONMENTS
Visible Light is more safe than RF, hence it can be used in
places where RF can't be used such as petrochemical plants ,
airplanes etc.

PUBLIC INTERNET HOTSPOT:-
 There are millions of street lamps deployed around
the world.
 Each of these street lamps could be a free access point.

 ON OCEAN BEDS
Li-Fi can even wok underwater were Wi-Fi fails completely,
thereby throwing open endless opportunities for
military/navigation operations.
POTENTIAL APPLICATION OF LI-FI

Advantages
• Largers bandwidth (10,000 times the radio)
• High efficiency
• More availability
• Highly secure

Dis-Advantages
 Intensity of light may vary
 Expensive as compared to wi-fi
 High quality of leds are used

CONCLUSION
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 Wi-Fi hotspots to
transmit wireless data.

REFERENCES
 Google
 Wikipedia.org
 Lificonsortium.org
 Purevlc.com
 Ebookbrowse.com

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