I see the future of technology alternative to WiFi. Oops!.
Harald Haas - A professor of engineering at Edinburgh University is the pioneer behind a new type of light bulb that can communicate as well as illuminate – access the Internet using light instead of radio waves.
Haas Quote: “Everywhere in a day there is light. Look around. Everywhere. Look at your smart phone. It has a flashlight, an LED flashlight. These are potential sources for high-speed data transmission.”
The system, which he's calling D-Light, uses a mathematical trick called OFDM (orthogonal frequency division multiplexing), which allows it to vary the intensity of the LED's output at a very fast rate, invisible to the human eye (for the eye, the bulb would simply be on and providing light). The signal can be picked up by simple receivers. As of now, Haas is reporting data rates of up to 10 MBit/s per second
(faster than a typical broadband connection), and 100 MBit/s by the end of this year and possibly up to 1 GB in the future.
He says: "It should be so cheap that it’s everywhere. Using the visible light spectrum, which comes for free, you can piggy-back existing wireless services on the back of lighting equipment."
"As well as revolutionizing internet reception, it would put an end to the potentially harmful electromagnetic pollution emitted by wireless internet routers and has raised the prospect of ubiquitous wireless access, transmitted through streetlights."