Comment on Japanese Institute breaks optical fiber speed record with 22.9 petabits per second — 1,000 times faster than existing cables

Corkyskog@sh.itjust.works ⁨1⁩ ⁨year⁩ ago

• Kazumara@feddit.de ⁨1⁩ ⁨year⁩ ago

  The financial types are generally more interested in hollow core fiber, to get their latencies even further down for high frequency trading. Because light travels at almost c in hollow core but only at 2/3 c in fiber core.

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  • Squizzy@lemmy.world ⁨1⁩ ⁨year⁩ ago

    So is hollow core fiber a vacuum or is it just hollow? I’ve never heard of that tech.

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    • GarytheSnail@programming.dev ⁨1⁩ ⁨year⁩ ago

      Think glass pipe versus glass cylinder or rod. Though, I don’t think the hollow core is fully empty, it has some structure to it.

      Here is an example

      Source: www.rp-photonics.com/hollow_core_fibers.html

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      • Squizzy@lemmy.world ⁨1⁩ ⁨year⁩ ago

        I work with fibre and have never stopped to think if it is hollow or not. Thanks for this

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      • datelmd5sum@lemmy.world ⁨1⁩ ⁨year⁩ ago

        How do you weld that?

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    • Kazumara@feddit.de ⁨1⁩ ⁨year⁩ ago

      I think that both fibers with air and those with vacuum exist, but it’s a bit far from my operational reality, so I’m not that sure. I just read in industry news that euNetworks has deployed 45 km of Lumenisity hollowcore fiber and that Microsoft bought Lumensity

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• PhlubbaDubba@lemm.ee ⁨1⁩ ⁨year⁩ ago

  Actually Wall Street intentionally increases their latency

  Some guy figured out that trades were getting sniped due to some locations having more latency than others relative to the trade location, so he developed a solution that intentionally lags the connection on different wires so that everyone gets their trade updates simultaneously and can’t snipe each other to up the prices on other people’s buys.

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