Li Fi Technology
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Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It was invented by Professor Harald Hass, who began researching it in 2004 and gave the first demonstration in 2011. Li-Fi works by varying the intensity of LED light faster than the human eye can detect to transmit digital 1s and 0s. It has applications in areas like traffic lights, underwater communication, airlines, hospitals, and hazardous environments. The advantages are high speed, high security, large bandwidth, and low costs, while the disadvantages include inability to pass through objects and potential interference from other light sources.
Li Fi Technology
- 2. Content Introduction History How Li-Fi Works ? Applications Advantage Disadvantage
- 3. What is Li-Fi ? Li-Fi is a wireless optical networking technology that uses Light-Emitting Diodes (LEDs) for data transmission. 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
- 4. History Harald Hass , who began his research in 2004.Finally succeed and gave a demonstration of what he called a LI-Fi prototype at TED global conference in Edinburgh on 12th July 2011. Professor Harald Hass Chair of Mobile Communications at the University of Edinburgh. Co-founder of pureLiFi
- 5. How Li-Fi Works ? • If LED is ON then Digital 1 is transmitted. • If LED is OFF then digital 0 is transmitted. • LED varies in intensity very fast (within 1μs) that a human eye can’t detect. • A controller connected at the back side of these LEDs is used to code the data.
- 7. Applications Traffic areas. Underwater communication. Used in petroleum or chemical plants where other transmission or frequencies could be hazardous.
- 8. Applications Airlines. Street lamps (As free access points). Operation theaters in the hospitals. Hazardous Environments
- 9. Advantages Fast and easy Data Transfer(10 Gbps) High Security Bandwidth(10,000 times greater than radio waves) low implementation and maintenance costs
- 10. Disadvantages Light can't pass through objects. High installation cost. Interference from external light source. Coverage distance
- 11. ?
- 12. Thank you..!
Editor's Notes
- #4: Light based Wi-Fi. Light is used instead of radio-waves to transmit information. Transceiver fitted LED lamps acts like Wi-Fi modems. LED lamps can light a room as well as transmit-receive information. Provides illumination as well as data communication.
- #5: Haas promoted this technology in his 2011 TED Global talk and helped start a company to market it. In October 2011, companies and industry groups formed the Li-Fi Consortium, to promote high-speed optical wireless systems. The first Li-Fi smartphone prototype was presented at the Consumer Electronics Show in Las Vegas from January 7–10 in 2014.
- #6: LED varies in intensity very fast (within 1us) that a human eye can’t detect. The LEDs can be switched on and off very quickly which gives nice opportunity for data transfer in the form of Binary code. Switching ON an LED is logical ‘1’,switching off an LED is logical ‘0’. A controller connected at the back side of these LEDs is used to code the data. Hence it is possible to encode the data into the LED’s by using a controller ,we just have to vary at which LED’s flicker depending on the data we want to encode to give different strings of 0’s and 1’s.
- #8: 2..its very much useful for military/navigation operations.
- #10: High data transmission rates of up to 10Gbps can be achieved. Since light cannot penetrate walls, it provides privacy and security that Wi-Fi cannot. Li-Fi has low implementation and maintenance costs. More secure because data cannot be intercepted without a clear line of sight.
- #11: High installation cost Interferences from external light sources like sun, light, normal bulbs, opaque materials