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Wireless Internet using a Light Bulb called Li-Fi,or Light Fidelity

Scientists at Shanghai's Fudan University have created a one-watt light bulb that provides access to wireless internet.Using a technology called Li-Fi, or light fidelity, the prototype created by the scientists is claimed to be an affordable and efficient alternative to existing means.

According to Chi Nan, an information technology professor with the university, four computers were found to be able to connect easily to the internet when kept near the Li-Fi bulb.

The use of light frequency enables all computers to connect simultaneously. The Li-Fi bulb, featuring a microchip, generates around 150 mbps that is 20 times faster than the average connection in China. Nan also states that the current wireless signal transmission equipment is expensive and inefficient.

"As for cell phones, millions of base stations have been established around the world to strengthen the signal but most of the energy is consumed on their cooling systems," Nan told Xinhuanet.
The new technology will be showcased at the China International Industry Fair beginning on 5 November in Shanghai, where around 10 sample Li-Fi kits will be displayed.
The new bulb is seen as a cost-friendly product that can greatly help in preventing hacking of wireless signals as light cannot penetrate walls when compared to radio signals.
The development comes at a time when the Chinese are replacing incandescent bulbs with LED light bulbs.
"Wherever there is an LED light bulb, there is an internet signal," said Nan. "Turn off the light and there is no signal."

The prototype is still at a very nascent stage and it will take several tests and changes before the product is developed for commercial use. The scientists need to focus on light communication controls, microchip design and manufacturing among several other areas, according to experts.
Li-Fi is a type of visible light communication technology that delivers high-definition videos to a computer. The term was conceived by Prof Harald Haas, an expert in optical wireless communications at the University of Edinburgh, who also demonstrated the functioning of the technology in 2011.

 Well, the Fraunhofer Heinrich Hertz Institute is claiming that speedy data rates of up 3Gbps have are indeed feasible. The boost comes from its latest enhancements, allowing the 180Mhz frequency to be used over the usual 30MHz, which apparently leaves extra room for moving data. If you'll recall, that's a significant leap over the 800Mbps top speed it achieved back in 2011 mixing various light colors. While this IR-like take on wireless internet access gains steam, remember that it's more likely to be used in areas where WiFi radios cause interruptions (hospitals, trade shows like CES, etc.) -- rather than a strip of mini spot lights from IKEA for the casa. (We can dream, can't we?) FHHI plans to show off the new gear at FOE '13, but for now you'll find the full press release after the break.

The next thing to think is how to hack a light bulb :)

source: http://news.xinhuanet.com/english/china/2013-10/17/c_132806591.htm

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