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Lifi technology


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Lifi technology

  1. 1. GL BAL Institute of Information Technology
  2. 2. A Presentation on Li-Fi Technology Group Members :- Rahul Sisodiya Ravikant Verma Jugendra Singh
  3. 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. 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. 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. 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. 8. WHY ONLY VLC Radio Waves Infrared Rays Visible Rays Ultraviolet Rays X-Rays Gama Rays
  9. 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. 10. ADVANTAGES
  11. 11. APPLICATIONS Traffic On Lights. Ocean Beds. Public Internet Hotspots.
  12. 12. 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.
  13. 13. Thank You !! Any Query ?