New Technology: Lifi

A microchipped bulb can produce data speeds of up to 150 megabits per second (Mbps), Chi Nan, IT professor at Shanghai's Fudan University told Xinhua News.

上海復旦大學信息技術學院遲楠教授對新華網記者表示，一個微晶元燈泡可以產生高達150M每秒的網速。

A one-watt LED light bulb would be enough to provide net connectivity to four computers, researchers say.

研究者還表示，一個1瓦的LED燈泡已經足以為四台電腦提供網路連接。

But experts told the BBC more evidence was needed to back up the claims. There are no supporting video or photos showing the technology in action.

不過專家也告訴BBC記者，佐證上述說法需要更多的信息。目前還沒有證實該技術成功運用的視頻或照片。

Li-fi, also known as visible light communications (VLC), at these speeds would be faster - and cheaper - than the average Chinese broadband connection.

Li-fi光保真，又稱為可見光通信（VLC） 將會比中國一般的寬頻網路連接速度更快，且價格更便宜。

In 2011, Prof Harald Haas, an expert in optical wireless communications at the University of Edinburgh, demonstrated how an LED bulb equipped with signal processing technology could stream a high-definition video to a computer.

在2011年，來自英國愛丁堡大學的光無線通信專家、哈拉爾德·哈斯教授，演示了一隻配備有信息處理裝置的LED燈泡是如何將高保真視頻傳輸到電腦上的。

He coined the term "light fidelity" or li-fi and set up a private company, PureVLC, to exploit the technology.

他創造了「光保真」這一術語，並且成立了一家私營公司，PureVLC來進一步開發這種技術。

This year, the Fraunhofer Heinrich Hertz Institute claimed that data rates of up to 1Gbit/s per LED light frequency were possible in laboratory conditions, making one bulb with three colours potentially capable of transmitting data at up to 3Gbit/s.

今年，德國弗朗霍夫海因里希赫茲研究所科學家稱，在實驗室的數據連接中，一個LED燈泡已經可以實現1兆比特每秒的速度，這樣一個三色的燈泡傳達數據的速度將可以達到3兆比特每秒。

Li-fi promises to be cheaper and more energy-efficient than existing wireless radio systems given the ubiquity of LED bulbs and the fact that lighting infrastructure is already in place.

考慮到LED燈泡的普遍性，而且照明基礎設施是既有的，光保真將比現有的無線廣播系統更加節能，更加環保。

Visible light is part of the electromagnetic spectrum and 10,000 times bigger than the radio spectrum, affording potentially unlimited capacity.

可見光是電磁光譜的一部分，比無線電頻譜要大1萬倍，因而可說具有無限的開發潛力。

But there are drawbacks: block the light and you block the signal.

但是它也有弊端：遮住光源，就遮住了信號。

Prof Chi's research team includes scientists from the Shanghai Institute of Technical Physics at the Chinese Academy of Sciences, Her team is hoping to show off sample li-fi kits at the China International Industry Fair in Shanghai on 5 November,the report says.

據報道稱，遲教授的研究團隊包括中國科學院上海技術物理研究所的眾多專家。她的團隊希望能夠在11月5號上海舉辦的中國國際工業博覽會上展出光保真樣品。

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