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GL

BAL

Institute of Information Technology
A Presentation on Li-Fi Technology

Group Members :-

Rahul Sisodiya
Ravikant Verma
Jugendra Singh
Contents : History.
 Introduction.
 What is Li-Fi ?


Drawback of before Li-Fi.



Why only VLC.



How Li-Fi works ?



Advantages.



Application Areas.



Conclusion.
HISTORY
The technology truly began during the 1990’s in countries like
Germany, Korea & Japan where they discovered LED’s could be
retrofitted to send information.
Li-Fi is a VLC (visible light communication) technology developed by a team
of scientists including Dr.Gordon Povey, Prof. Harald Haas and Dr.Mostafa
Afgani at the University of Edinburgh . The term Li-Fi was coined by Prof .
Haas when he amazed people by streaming high - definition video from a
standard LED lamp at TED Global in July 2011 . Li - Fi is now part of the
VLC PAN IEEE 802.15.7 standard. Li-Fi is typically implemented using
white LED light bulbs. These devices are normally used for illumination by
applying a constant current through the LED.
Introduction
In simple terms, Li-Fi can be thought of as a light-based Wi-Fi.
That is, it uses light instead of radio waves to transmit information.

And instead of Wi-Fi modems, Li-Fi would use transceiver-fitted
LED lamps that can light a room as well as transmit and receive
information. Since simple light bulbs are used , there can technically
be any number of access points.
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.
DRAWBACK OF BEFORE LI-FI
WHY ONLY VLC
Radio Waves
Infrared Rays
Visible Rays
Ultraviolet Rays
X-Rays
Gama Rays
How Li-Fi Works?
Li-Fi is typically implemented using white LED light bulbs
at the downlink transmitter . These devices are normally
used for illumination only by applying a constant current.
However, by fast and subtle variations of the current , the
optical output can be made to vary at extremely high speeds.
The operational procedure is very simple, if the LED is on, you
transmit a digital 1, if it’s off you transmit a 0. The LEDs
can be switched on and off very quickly, which gives nice
opportunities for transmitting data.
ADVANTAGES
APPLICATIONS
Traffic
On

Lights.

Ocean Beds.

Public

Internet Hotspots.
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.
Thank You !!

Any Query ?

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Lifi technology

  • 2. A Presentation on Li-Fi Technology Group Members :- Rahul Sisodiya Ravikant Verma Jugendra Singh
  • 3. Contents : History.  Introduction.  What is Li-Fi ?  Drawback of before Li-Fi.  Why only VLC.  How Li-Fi works ?  Advantages.  Application Areas.  Conclusion.
  • 4. HISTORY The technology truly began during the 1990’s in countries like Germany, Korea & Japan where they discovered LED’s could be retrofitted to send information. Li-Fi is a VLC (visible light communication) technology developed by a team of scientists including Dr.Gordon Povey, Prof. Harald Haas and Dr.Mostafa Afgani at the University of Edinburgh . The term Li-Fi was coined by Prof . Haas when he amazed people by streaming high - definition video from a standard LED lamp at TED Global in July 2011 . Li - Fi is now part of the VLC PAN IEEE 802.15.7 standard. Li-Fi is typically implemented using white LED light bulbs. These devices are normally used for illumination by applying a constant current through the LED.
  • 5. Introduction In simple terms, Li-Fi can be thought of as a light-based Wi-Fi. That is, it uses light instead of radio waves to transmit information. And instead of Wi-Fi modems, Li-Fi would use transceiver-fitted LED lamps that can light a room as well as transmit and receive information. Since simple light bulbs are used , there can technically be any number of access points.
  • 6. 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.
  • 8. WHY ONLY VLC Radio Waves Infrared Rays Visible Rays Ultraviolet Rays X-Rays Gama Rays
  • 9. How Li-Fi Works? Li-Fi is typically implemented using white LED light bulbs at the downlink transmitter . These devices are normally used for illumination only by applying a constant current. However, by fast and subtle variations of the current , the optical output can be made to vary at extremely high speeds. The operational procedure is very simple, if the LED is on, you transmit a digital 1, if it’s off you transmit a 0. The LEDs can be switched on and off very quickly, which gives nice opportunities for transmitting data.
  • 10.
  • 11.
  • 14. 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.
  • 15. Thank You !! Any Query ?