• agitatedpotato@lemmy.world
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    1 year ago

    I like how they quickly glance over the fact that you need line of sight to connect and call that a good thing because people behind a wall cant steal your data.

    • j4k3@lemmy.world
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      1 year ago

      Within the same room, it is possible to use a frequency of light that will reflect off of almost anything. I just got a window AC unit with a remote that defies physics. Like I can have a desk, and closed plantation shutters (slats and doors) in front of the receiver on the front of the unit, point the remote anywhere in the wrong direction and still activate the thing. It’s just an IR LED transmitter setup. I’ve never seen one that is quite this powerful. It is uber cheapo general electric bottom of the consumer grade junk category too.

      This is the NSA’s wet dream tech. Anyone with line of sight could intercept the data stream.

      • nothacking@discuss.tchncs.de
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        1 year ago

        For low datarates sure, but at high speeds the dispersion caused by light taking multiple paths will be unacceptable. The reason single node fiber is so thin is to make sure light can only travel along one path. If you want multi gigabit speeds, you will need a direct line of sight.

      • redcalcium@c.calciumlabs.com
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        1 year ago

        I put my smart IR blaster behind my tv and it still works. It can even reaches the AC unit in my room if the door is open.

    • Litany@kbin.social
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      1 year ago

      It absolutely is a good thing when security is concerned. WiFi is easy to snoop even if you’re not physically in the room, if you know what you’re doing. Sure there are encryption standards that are very good to tamp down on this. However, what’s even better with LiFi is you must be physically in the room to intercept any transmissions that are being sent.

      This is by design one of the largest advantages to LiFi. There are other practical uses as well, but it’s not like LiFi is designed to explicitly replace WiFi.

      • FaceDeer@kbin.social
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        1 year ago

        I could easily imagine having both this and traditional wifi on a device, so that it can fall back to radio frequencies if higher frequency light fails it. Wifi is super cheap these days.

    • FaceDeer@kbin.social
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      1 year ago

      It’s going to be great if you don’t imagine it as a one-for-one replacement for traditional wifi and use it in applications that are specific to its strengths and weaknesses.

      Also, just how dusty is your house that one week’s accumulation is enough to snuff out a signal?

  • Zellith@lemmy.fmhy.ml
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    1 year ago

    “Advantages of using light rather than radio frequencies”

    Nobody tell em how the electromagnetic spectrum works!

      • Lmaydev@programming.dev
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        1 year ago

        the key technical difference being that Wi-Fi uses radio frequency to induce an electric tension in an antenna to transmit data, whereas Li-Fi uses the modulation of light intensity to transmit data.

  • Crow@lemmy.world
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    1 year ago

    So IR blasters were the future all along? Maybe not infrared exactly but it seems pretty similar.

  • BurningnnTree@lemmy.one
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    1 year ago

    Is this expected to be a niche technology, or is it something that regular people will use? Seems like it would be a hassle to make sure that your li-fi receivers are within line of sight of your li-fi transmitters or whatever.

    • The Dark Lord ☑️@lemmy.ca
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      1 year ago

      I could imagine it being installed on ceilings within certain rooms. Devices could be connected to both lifi and wifi. If lifi isn’t working it could fall back to wifi. But in reality, I have a feeling this will just be in niche scenarios, yes. I can imagine wifi getting 100x faster before this catches on.

    • Glisten6159@waveform.social
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      1 year ago

      One in the ceiling of every room you want coverage in would be fine. Enterprise grade ones in stores.

      More importantly, though, it is more secure and higher performing. Could see the government using this for wireless SIPR rooms. They won’t until the tech is tested and refined first though.

      Let the hobby community do that part and the regular consumer will see something very usable in a few years.

  • nothacking@discuss.tchncs.de
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    1 year ago

    This is slightly less practical than just connecting your devices with fiber, at least you can run a cable around corners, and your connection won’t drop is a piece of paper block the line of sight to the access point.

  • giacomo@lemmy.world
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    1 year ago

    Sounds like a cool replacement for point to point WiFi bridges. I wonder what sort of distances start to impact data rates and quality just due to air density or weather.

    • thisisnotgoingwell@programming.dev
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      1 year ago

      As I understand, this is very low distance, basically for office settings. What ISPs will do to connect to/provide connectivity to a remote site is install point to point microwave radios. They are not impacted by weather too much, but they do lose signal strength if the radios are misaligned. There have been some funny situations where signals will be out of spec because protected birds like bald eagles are nesting on the radio and it is illegal to disturb their nests, or squirrels are storing acorns in them.

      That is what service providers will do if they want to offer cellular connectivity to a small town where running fiber would cost millions of dollars. They will contract a service provider to provide CTBH (Cell Tower Backhaul) via point to point microwave radios. Multiple radios can be used for redundancy / to add bandwidth capabilities by bonding channels together, suddenly they can provide 4g/5g cellular connectivity without needing to spend millions of dollars in installing fiber.

    • shortwavesurfer@monero.town
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      1 year ago

      Really depends on the size of the receiver. Its possible to use it at interplanetary distances if we are willing to build a mirror 10s of square miles in size. For point to point my guess would be a few miles. The horizon is the cutoff point for sure so one beam could never be more then the line of sight horizon at the altitude of the receiver for sure.

      • FaceDeer@kbin.social
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        1 year ago

        You’d probably need a modified protocol for interplanetary distances, the lightspeed delay would probably cause timeouts and other problems with the usual approach.

        A more realistic application might be if there’s a way to get the signal up to a Starlink satellite or similar low-Earth-orbit relay. Cloud cover might be a problem for that though.

  • kingthrillgore@kbin.social
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    1 year ago

    I can see LiFI being used in self driving systems as ideally you will always have LOS with other vehicles and it could be useful for signaling.

    Otherwise the applications arent great due to LOS.