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LI-Fi Technology

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LI-Fi Technology

  1. 1. Presented By:- Krupa Shingala
  2. 2.  Introduction  History Of Network  Drawbacks Of Before Technologies  Why Only VLC?  What is VLC?  What is Li-fi?  Working process  Applications  Advantages & Disadvantages  Conclusion Content
  3. 3. INTRODUCTION  Internet services are very highly demanding and essential accessories in current situation.  Presently we are utilizing the wired networks and mostly wireless networks like Wi-Fi in our houses, offices, shops, hotels, college campus and around 10-100 meter distances to connect our P.C., Laptops, Mobile Phones.  As present paper tells about the newly introduced Li-Fi technology network which is based the visible light communication that provide a fast data speed about greater than 10 Gbps.
  4. 4. HISTORY OF NETWORKS  In the olden days, People formed a network in order to transmit a piece of data from one place to another.  With the advances in technology a new networking was developed using wires as a medium ( wired networking ).  As time passed the technology increased and we launched satellites into space and thus were in a position to transmit enormous amount of data across various geographical location.  Wireless networking gained a wide recognition and become the most popular of all networks ( example ): Wi-Fi.  As technology keep on developing , the latest wireless network LI-FI is introduced to overcome disadvantages of radio frequency communication.
  5. 5. Drawbacks Of Before Technologies Radio spectrum  1.4 Million base stations, 5 billion Mobile stations  600tb data every per month
  6. 6. Radio Spectrum is congested but the demand for wireless data double each year. Everything, it seems want to use wireless data but the capacity is drying up.  Available within the range of Base stations  Limited availability  Unavailable in aircrafts  Less secure (passes through the walls)  Cost and Expensive  Less bandwidth compared to other spectrums  Harmful to humans health
  7. 7.  Single data stream  10,000 or 20,000 bits per second  Not usable for video streaming
  8. 8.  CAN IT BE GAMMA RAYS ? NO  CAN IT BE X-RAYS ? NO  X-RAYS HAVE SIMILAR HEALTH ISSUES  CAN IT BE UV RAYS? NO why only VLC  CAN IT BE INFRARED WAVES ? NO  INFRARED, DUE TO EYE SAFETY REGULATION, CAN ONLY BE USED WITH LOW POWER. HENCE WE ARE LEFT WITH ONLY THE VISIBLE - LIGHT SPECTRUM.  GAMMA RAYS ARE RADIOACTIVE AND DANGEROUS FOR HEALTH.  UV RAYS ARE HARMFUL FOR OUR SKIN AND CANNOT BE USED FOR LONG DURATION
  9. 9.  Visible light communication ( VLC ) is a potential solution to the global wireless spectrum shortage.  Li-Fi technology is based on Visible Light communication.  VLC is a data communication medium, which uses visible light between 400 THz and 800THz as optical carrier for data transmission and illumination.  It uses fast pulses of light to transmit information wirelessly. VISIBLE LIGHT COMMUNICATION
  10. 10. What Is Li-Fi???  Li-Fi means “Light Fidelity”.  At the heart of this technology is a new generation of high brightness light-emitting diodes.  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.
  11. 11.  LI-FI ( Light-Fidelity ) is transmission of data through illumination ,sending data through a LED light bulb that varies in intensity faster than human eye can follow.  German Physicist, Dr.Harald Haas a professor in university of Eddinburgh who began his research in the field in year 2004. Harald Haas
  12. 12.  Light power(LED)  Multiple data streamHigh speed
  13. 13. HOW LI-FI WORKS ?  The operation procedure is very simple, if the LED is on, you transmit a digital 1, if it's off you transmit a digital 0.  They can be switched on and off very quickly, which gives nice opportunities for transmitting data.
  14. 14. The main components of this communication systems are  A high brightness white LED, Which act as a communication source.  A silicon photodiode which shows good response to visible wavelength region serving as the receiving element. Transmitting element Receiving element
  15. 15.  The functioning of new Li-Fi technology is just simple. You will have a light source at one end like a LED and a photo detector (Light Sensor) on the other end.
  16. 16. A Li-Fi Environment
  17. 17. AIRCRAFT CABINS  Used in airlines: Generally in airlines mobile phones can’t be used as they can effect the radars which are main way of communication.
  18. 18. TRAFFIC SYSTEM  Used in traffic lights which can communicate with cars to avoid accidents.
  19. 19. PUBLIC INTERNET HOTSPOT Street lamps(as free access points)
  20. 20. ADVANTAGES ….  Larger bandwidth ( 10,000 times the radio bandwidth )  High speed data rate  High efficiency  Highly secure  Safe for health  More availability  Low cost solution
  21. 21. CONCLUSION  The possibilities are numerous and can be explored further. If this technology can be put into practical use, every bulb can be used as Li-Fi access point to transmit wireless data and we will proceed toward the cleaner, greener, safer &brighter future !  This may solve issues such as the shortage of radio frequency bandwidth and also internet where radio based wireless isn’t allowed such as aircraft, Hospitals, etc…
  22. 22. REFERENCES  Google  Wikipedia  Lifeconsortium.org  Newtecarticles.com  Seminarprojects.com  Irjcjournals.org  extremetech.com

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