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  1. 1.  Li-Fi is the transmission of data through illumination by taking the fiber out of fiber optics by sending data through a LED light bulb. This varies in intensity faster than Human Eye can follow. It is the fast and cheap wireless communication system which is optical version of the Wi-Fi.
  2. 2. Its Working is much simply explained as follows: If the LED is on, the digital 1 is transmitted. And if it is off, the digital 0 is transmitted. 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 and0s.
  3. 3. Li-Fi product consists of 4 primary sub- assemblies: Bulb RF power amplifier circuit (PA) Printed Circuit Board (PCB) Enclosure
  4. 4.  The PCB controls the electric inputs and outputs of the lamp and houses the microcontroller used to manage different lamp functions. An RF (radio-frequency) signal is generated by the solid-state PA and is guided into an electric field about the bulb.
  5. 5.  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. All of these sub-assemblies are contained in an aluminium enclosure.
  6. 6.  Li-Fi is a term of one used to describe visible light communication technology applied to high speed wireless communication. It acquires this name due to the similarity to Wi- Fi, only using light instead of radio.
  7. 7.  Wi-Fi is great for general wireless coverage within buildings, and Li-Fi is ideal for high density wireless data coverage in confined area and for relieving radio interference issues, so the two technologies can be considered complimentary.
  8. 8. Technology Speed Data density Wierless (current) Wi-F-IEEE 150Mbps * 802.11n Bluetooth 3Mbps * IrDA 4Mbps ***
  9. 9. Technology Speed Data density Wireless (future) Wi-Gig 2Gbps ** Giga-IR 1Gbps *** Li-Fi 1Gbps ****
  10. 10.  Li-Fi technology is based on LEDs for the transfer of data. The transfer of the data can be with the help of all kind of light i.e Light may be Invisible, Ultraviolet or Visible part of spectrum. The speed of the internet is incredibly high and the user everything in just a few minutes.
  11. 11. Some of the applications of Li-Fi are given below: Medical field Airlines Power plant Military operations Under sea water
  12. 12.  Used for modern medical instruments. Used in petroleum or chemical plants where other transmission or frequencies could be hazardous. Thousands and millons of street lamps can be transferred to Li-Fi lamps to transfer data.
  13. 13.  It is possible to achieve more than 10Gbps, theoretically allowing a high-definition film to be downloaded in 30sec. Mostly powered by LEDs so it is cost efficient. Transmission of data is fast and easy.
  14. 14.  The concept of Li-Fi is currently attracting a great deal of interest, not least because it may offer a genuine and efficient alternative to radio-based wireless. As a growing number of people and their devices access wireless internet, the air waves are becoming increasingly clogged, making it more and more difficult to get a reliable, high-speed signal.