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  1. #1
    Super Moderator no1mad's Avatar
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    WiFi successor in development.

    Saw this on my Google+ feed. It is shared publicly, so I'm just going to do a c & p so that those who don't have G+ accounts can see:



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    Shared publicly - 12:05 AM

    Researchers beat fiber optic broadband speeds using visible LED light

    High speed data is already being transmitted by visible light to the moon, so why not in your living room, too? After the Fraunhofer Institute showed off 3Gbps speeds with LED lights, researchers from five UK universities have managed to transmit data at 10Gbps using micro-LEDs with a technique they've coined "LiFi." The team was able to crack the barrier by combining 3.5Gbps streams in each of the red, green and blue frequencies that make up white light. Such a technique could one day work with existing light bulbs, promising higher speeds than current WiFi and increased security -- since visible light can't penetrate solid objects like walls. In addition, a single bulb could theoretically provide connectivity for up to four devices. For now, such devices are confined to the lab, but given the torrid pace of development, don't be surprised if your data connection is soon a click of the switch away.
    lifi.jpg
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  2. #2
    Pedaled too far. Artkansas's Avatar
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    I have to wonder how they correlate this with standard room lighting. Naively, I imagine pulsing light as the data passes along. That would seem disconcerting to me and I wonder if this might not give epileptics fits.
    "He who serves all, best serves himself" Jack London

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  3. #3
    A tiny member bikeguyinvenice's Avatar
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    And how exactly will a beam of light be better than a radio signal? A beam of light is easily broken.
    My cycling blog http://kcmjr.wordpress.com/
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  4. #4
    Super Moderator no1mad's Avatar
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    Quote Originally Posted by bikeguyinvenice View Post
    And how exactly will a beam of light be better than a radio signal? A beam of light is easily broken.
    A bit more secure? I can see applications in the home networking area, as the signal can't travel through the walls- nobody piggybacking on your network (though it should've been encrypted to prevent it).
    Quote Originally Posted by Cyril View Post
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  5. #5
    Super Moderator no1mad's Avatar
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    Quote Originally Posted by Artkansas View Post
    I have to wonder how they correlate this with standard room lighting. Naively, I imagine pulsing light as the data passes along. That would seem disconcerting to me and I wonder if this might not give epileptics fits.
    In the early stages, sure. But what if the technology could progress to the level that it is akin to light therapy? Or possibly even to point where one could project emotion?
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  6. #6
    genec genec's Avatar
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    Quote Originally Posted by no1mad View Post
    A bit more secure? I can see applications in the home networking area, as the signal can't travel through the walls- nobody piggybacking on your network (though it should've been encrypted to prevent it).
    That signal not traveling through walls though is the weak area... how is sister going to use this network in her bedroom while mom is using it downstairs, and little brother wants to use it in the garage? Light is line of sight... so you just took any area not in sight and put it out of reach.

  7. #7
    Senior Member Shimagnolo's Avatar
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    Quote Originally Posted by Artkansas View Post
    I have to wonder how they correlate this with standard room lighting. Naively, I imagine pulsing light as the data passes along. That would seem disconcerting to me and I wonder if this might not give epileptics fits.
    Your TV set pulses image fields at 60Hz.
    Ever heard of anyone getting an epileptic fit from it?
    No, because it is too fast to see.
    Now try to see something blinking 100,000,000 times that fast.

  8. #8
    Pedaled too far. Artkansas's Avatar
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    Quote Originally Posted by Shimagnolo View Post
    Your TV set pulses image fields at 60Hz.
    Ever heard of anyone getting an epileptic fit from it?
    Um, yes. Photosensitive epilepsy.

    And basically, the data rate of a TV is about 20,995,200 bps for each of the RGB channels,(720x486x60) the difference may not be that great.
    Last edited by Artkansas; 10-31-13 at 11:43 AM.
    "He who serves all, best serves himself" Jack London

    Quote Originally Posted by Bjforrestal View Post
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  9. #9
    genec genec's Avatar
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    Quote Originally Posted by Shimagnolo View Post
    Your TV set pulses image fields at 60Hz.
    Ever heard of anyone getting an epileptic fit from it?
    No, because it is too fast to see.
    Now try to see something blinking 100,000,000 times that fast.
    Is this visible light or IR... you can't see IR. Oh but good point on the speed... at that rate it would look just like a dim light.

  10. #10
    AEO
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    you know what I hate most about the remote control for the TV and PVR?

    it uses IR, so requires line of sight to work.

    okay, well that's not the only thing I hate most about it, and I have a massive list of grievances for these remote controls, but requiring LOS to work is a massive step backwards.


    Best remote I've used thus far is the PS3 bluetooth remote, but that's only because I don't need LOS to use it.
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  11. #11
    genec genec's Avatar
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    Quote Originally Posted by AEO View Post
    you know what I hate most about the remote control for the TV and PVR?

    it uses IR, so requires line of sight to work.

    okay, well that's not the only thing I hate most about it, and I have a massive list of grievances for these remote controls, but requiring LOS to work is a massive step backwards.


    Best remote I've used thus far is the PS3 bluetooth remote, but that's only because I don't need LOS to use it.
    The first remotes used audible tones... in fact as a kid I used to "fool" TV by jingling keys... then they came out with ultrasonic remotes... not sure why those were later abandoned... except perhaps that pets were bothered; then came IR. Don't know why RF wasn't used... today it is quite easy to go low power and spread spectrum for such a device... and perhaps more intense "house remotes" go that route. (I don't know...)

  12. #12
    Fax Transport Specialist black_box's Avatar
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    Quote Originally Posted by Artkansas View Post
    I have to wonder how they correlate this with standard room lighting. Naively, I imagine pulsing light as the data passes along. That would seem disconcerting to me and I wonder if this might not give epileptics fits.
    I don't think it has to be on/off. It could be changing the phase of the signal. Or even fancier for light, changing the polarization.

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