Li—Fi來襲：開盞LED燈上網(wǎng)去

A microchipped bulb can produce data speeds of up to 150 megabits per second （Mbps）， Chi Nan， IT professor at Shanghais Fudan University said.

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

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.

上海復(fù)旦大學(xué)信息技術(shù)學(xué)院遲楠教授表示，一個(gè)微芯片燈泡可以產(chǎn)生高達(dá)150MB每秒的網(wǎng)速。

研究者還表示，一個(gè)1瓦的LED燈泡已經(jīng)足以為四臺(tái)電腦提供網(wǎng)絡(luò)連接。

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(shí)該技術(shù)成功運(yùn)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.

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.

He coined the term “l(fā)ight fidelity” or li-fi and set up a private company， PureVLC， to exploit the technology.

In 2013， 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.

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.

Visible light is part of the electromagnetic spectrum and 10，000 times bigger than the radio spectrum， affording potentially unlimited capacity. But there are drawbacks： block the light and you block the signal.

Li-Fi，光保真，又稱為可見光通信（VLC），將會(huì)比中國一般的寬帶網(wǎng)絡(luò)連接速度更快，且價(jià)格更便宜。

在2011年，來自英國愛丁堡大學(xué)的光無線通信專家，哈拉爾德·哈斯教授，演示了一只配備有信息處理裝置的LED燈泡是如何將高保真視頻傳輸?shù)诫娔X上的。

他創(chuàng)造了“光保真”這一術(shù)語，并且成立了一家私營公司PureVLC來進(jìn)一步開發(fā)這種技術(shù)。

2013年，德國弗朗霍夫海因里希赫茲研究所稱，在實(shí)驗(yàn)室環(huán)境下，一個(gè)LED燈泡的數(shù)據(jù)傳送速率達(dá)到1GB每秒已經(jīng)成為可能，這樣一個(gè)三色的燈泡傳達(dá)數(shù)據(jù)的速度將可以達(dá)到3GB每秒。

考慮到LED燈泡的普遍性，而且照明基礎(chǔ)設(shè)施是既有的，光保真將比現(xiàn)有的無線廣播系統(tǒng)更加節(jié)能，更加環(huán)保。

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(fā)潛力。但是它也有弊端：遮住光源，就遮住了信號(hào)。