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"Light" exactly? So cool, advanced

December 1,2015
SUK INDUSTRIAL LIMITED
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Technology Education Internet Media

Recently certified by the test at the Ministry, China's "study on keytechnology of visible light communication system" major breakthroughsrecently, real-time communication speed up to 50Gbps, equivalent to 0.2seconds to complete a HD movie downloads. Experts say that opticalcommunications technology can break through the radio spectrum resourceshortage woes, is one of the next-generation wireless communicationstechnology has broad application prospects, can form trillion level output value of emerging industries of strategic importance. This "light" is what?In addition to what film do?

With the lights on, phone call can have power and Internet access, it soundscool, but this advanced technology has been in the lab environment, forordinary people, how long is this project out of the lab, what would makeour lives changed?

Exactly how light transmits information?

As early as 2004, IEEE journal papers to explain through light-emittingdiodes (that is, the LED lamps) provide wireless network connection method,which works like this:

LED lights is a semiconductor chip, unlike conventional filament is is, thechip can switch quickly, for example, 60 Hz AC power light, the human eyecannot recognize lights flashing. At the time of opening and closing, lightwave, modulated can pass information, we usually use the phone's radio is no different.

Related to the current global University has research projects, most of themin the laboratory. In 2012, on the IEEE Communications magazine haspublished a dissertation on visible light transmission rates of up to96Mb/s. By the end of 2013, lab of Fudan University in Shanghai have beenable to light a power is 1W LED lamp bead, 4 computers Internet provides thelight, the highest rate of 3.25Gbp per second, average Internet speed up to150Mb/sec.

Microsoft Asia which is mentioned earlier in this study. And lab will bringlight to the device attempts to limit the peak is not the same, wanted tostudy the possibility of this technology in the electronic equipment, so histeam in Taobao buy cheap LCD panels, solar panels and circuit boards of a few dollars and can be tested.

At present, Shen guobin team on how to reverse the reflector (Retro-Reflector), is actually a kind of reflector, the light reflecting back onthe LED light the same way, forming a LED and mutual communication betweenelectronic devices. They have done, under the lights 1 Gigabit switchingfrequency, from lights to the downstream speed of the device up to 10kb/sand reflective uplink speeds of 0.5kb/s from the device.

Microsoft's research and Development Center in Asia, we see this experimentmade with cheap components: no cord, no Wi-Fi signal, one equipped with LCDscreens, mirrors and solar panels similar to the mobile device. Direct lightLED bulbs flashlight, the device will light up and start transmitting data.LED lamp into a common equipment of energy source and a source ofinformation.