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Thread: Wireless data from every light bulb

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    Default Wireless data from every light bulb

    Hmmm...



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    That's brilliant, and I'm not just talking bright, very clever

    Would be very useful where rf just won't work, could even then be linked to darkest corners by fibreoptic
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    Maybe this will be the communications mode of the future, who can tell.
    Back in the mid 50's I saw a demo at a traveling school science class of light from a torch being shone in one end of a solid tube about 18 inches long, 2 inches in diameter and the other end lighting up.
    The instructor then bent the tube about and the light followed the shape no matter how it was shaped.
    The tube was made of optical fibre, at the time a science curiosity that now is the very backbone of modern communication transmission.
    So will this LED be the transmitter of data of the future or will it lead to other avenues not yet available?
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    Nope, this one is dead in the water.
    Didn't we have this thread about a year ago ?

    While I'm rocking the boat, have you considered how the upstream traffic is going to work ?

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    corners by fibreoptic
    yes we use it now, and trash mentions the upstream, interesting though

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    I dont see a problem there as the demo was really to show what could be done by modulating the LED, ie Transmit to a receiver.
    From my understanding Optic fibre works 'better' if a single fibre is used for each direction so why cant you adapt the same for the LED?
    Just think what volume could be sent if this was adapted to replace a microwave dish?
    No RF emmissions, cooler, lower power..................
    Whether this is 'old,dead in the water' technology may well be true but what might this idea lead too?

    Heres a thought, what if you were to modulate a traffic signal light?
    The light is 'aimed' along the street and transmits information into your car re traffic conditions, weather,news/TV/digital radio or even controls your speed as you approach the light with a warning that the lights are about to change to RED?
    A perfect example of a one way data flow.
    Last edited by gordon_s1942; 16-01-12 at 12:26 PM.
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    ok so who is governing the downstream data, where does the up stream go? He always talks about transmitting, never about recieving data

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    I took it they were refering to receiving the same way as an IR LED works in a Remote Control, one transmits, the other receives.
    The only reason an IR LED isnt on all the time is to both save the battery and its minimal usage.
    Imagine coming into a room with your Laptop, turning on the room light or desk lamp and that being the 'connection' to the internet.
    Obviously the Laptop wouldnt have a 'Visible' light transmitter LED in your face,(IR perhaps?) it would be mounted at or near the camera in the top of lappy's case so it could be 'seen' by a 'receiving' LED mounted suitably in the room.
    The 'receiving' LED could be mounted one side, the 'transmitter' LED on the other of the camera.
    Its my understanding the average user downloads far more Data than they Upload.
    My satelitte Internet allows me to chose slower upload speeds as compared with Download speeds.
    Last edited by gordon_s1942; 16-01-12 at 09:37 PM.
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    So if you have to install an IR receiver this defeats the purpose of the application, ie, not to install anything.
    If you're going to install a receiver, then it would make sense to have an IR diode transmitter which has a much better bandwidth than the lightbulb

    What we have here is an obscure method of IrDA.

    Quote Originally Posted by gordon_s1942 View Post
    From my understanding Optic fibre works 'better' if a single fibre is used for each direction so why cant you adapt the same for the LED?
    Not really, optic fibre works ok in both directions at the same time.
    It is more common to use two fibres in most cases.
    There is lower bit errors on high capacity DWDM using two fibres as one way simplex each than a single duplex fibre. When it's 10/100/1000GBps small bit error rates start to matter. It's just simpler to use one fibre in each direction and it does not add that much to the cost of the fibre cable.

    For last mile applications, single fibre is often used. It's nothing but a simple two way splitter with 3dB loss. Who cares if half the power ends up in the laser diode

    Actually, laser diodes often have a power control sense diode in them, which as it turns out you can use as an RXer. Though it is swamped by the laser diode itself so the laser needs to be turned off to receive.
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    Years ago I heard about optic 'gratings' - like microwave circulators for fibre optic cable. Ideal application for this perhaps?

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