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Will LED-based Wi-Fi work?

Source: edn
Category: LED Applic...
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文章创建人 BY CAROLYN M...

Original Title:Will LED-based Wi-Fi work?

  Professor Harald Haas, Edinburgh University chair of mobile communications, is researching using LEDs in the transmission of electronic data. Dubbed LiFi for light fidelity, the process encodes data onto LED bulbs. According to Haas, he has found a way to encode a high-rate bit stream to the changes in light intensity in order to send very high-speed data.



  Source: pureLiFi

  He is developing LiFi through pureLiFi, the company he co-founded in 2012, claiming 100 Gigabit per second compared with Wi-Fi speeds of 7 Gb, a speed increase of 10-20x with LiFi.

  LiFi is also free wherever people use LED lights. Haas said: “Wherever you see an LED light you need to think of it as a high speed data transmitter – from your kettle, your fridge, from the street light in front of your house, car headlights, traffic lights.”

  Haas is claiming that the transmitters can also be implanted under the skin for medical monitoring applications. He also states that LiFi is more secure than traditional wireless as Li-Fi communications do not go through walls or other barriers. In the US, the Golden State Warriors basketball team in San Francisco is testing the technology for its new stadium, opening in 2018. The draw in this environment is the bandwidth available via LiFi that is unavailable with its Wi-Fi counterpart.

  The technology is based on a CMOS digital to analog converter developed at the University of Edinburgh. The ultra-parallel visible light communications depend on multiple colors of light to supply high-bandwidth communications. At the IEEE Photonics Conference consortium, members demonstrated the use of commercially available red, green, and blue LEDs as emitters and as photodiodes to detect light. Members of the consortium created an improved LED that provides a data rate close to 4 Gbps operating on 5 mW of optical output power using high-bandwidth photodiodes at the receiver. So far they can send data 10 meters at up to 1.1 Gbps, and are on their way to 15 Gbps.

  Their use of avalanche photodiodes also improves receivers, whereby a single photon striking the receiver produces a cascade of electrons, amplifying the signal. Haas’ team developed the first receiver chip for LiFi with 49 integrated avalanche photodiodes on CMOS.

  Others are jumping onto the bandwagon. The Fraunhofer Institute for Photonic Microsystems in Dresden, Germany, for example, demonstrated a LiFi hotspot at Electronica 2014. The hot spot was set to be a point-to-point link with a data rate of up to 1 Gbps.

  The technology is aimed at both industrial and consumer applications. Haas is optimistically expecting LEDs to have the processing power of today’s cellphones. So far he’s been able to attract funds with PureLiFi seed funding coming in part from the Scottish government.

  So, what do you think? Are you as optimistic as Haas? What do you see as the future or the reality of LiFi?


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