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Li-fi PowerPoint Presentation


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  1. Li-fi How Does It Work? Who is making it? What is the catch? Fudan University in Shanghai are finding a way to wirelessly transfer information using light instead of radio waves. Li-fi can only work if the light illuminating from the Li-fi LED can be picked up by the receiving device. Li-fi works with regular, plain old LED lights which are found everywhere. Data is sent to the LEDs, and they flicker rapidly in a pattern. A camera made for sensing light can then pick up the frequency and read the pattern like morse code. Won’t the constant flickering of the lights become annoying? Sunlight can interfere with your Li-fi connection even through windows. You would have to use Li-fi in a room with no windows, and you would not be able to turn out the lights. Dimmed lights may result in lost data, and slower connections. The LEDs are flickering so quickly, that it would appear as a steady stream of light. Normal florescent office lights flicker 20,000 times per second. Li-fi flickers billions of times per second. That’s a lot of data! Because light runs on a much higher frequency than radio waves, data transferred with radio waves is limited. Researchers began working with light outside the visible spectrum to combat these disadvantages. Li-fi can transfer data at a rate of 1Gbit/s They claim that using infrared lights could work outside and even boost connection speeds to 5 gigs per second. Different colors of LEDs could transfer data on different signals.