this post was submitted on 07 Dec 2023
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652
Japanese Institute breaks optical fiber speed record with 22.9 petabits per second — 1,000 times faster than existing cables (www.tomshardware.com)
submitted 9 months ago by [email protected] to c/[email protected]
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Speedy thing goes in, speedy thing comes out.

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[–] [email protected] 76 points 9 months ago (1 children)

For those wanting a bit of a summary.

transmitting up to 22.9 petabits per second (Pb/s) through a single optic cable composed of multiple fibers

The breakthrough isn’t things moving faster but more fibers per cable. So you can transfer more bits in parallel.

That’s still a good breakthrough because, for lots of reasons, packing more fibers in isn’t as straight forward as one would think.

[–] [email protected] 86 points 9 months ago* (last edited 9 months ago) (3 children)

The breakthrough isn’t things moving faster but more fibers per cable.

No, it's actually more cores per fiber, and using those very well for space division multiplexing on top of the normal wavelength division multiplexing. They are talking about 22.9 Pb/s per fiber, not cable, the Tom's Hardware article is just wrong.

Cables can already contain hundreds of fibers, for example 576 here or into the thousands if you use stacks of ribbon cables in the subunits, for example 3456 here

[–] [email protected] 67 points 9 months ago (1 children)

Here's a source that backs up what you're talking about and proving that the TomsHardware article is wrong: https://www.nict.go.jp/en/press/2023/11/30-1.html

[–] [email protected] 22 points 9 months ago (1 children)

Thank you!

[–] [email protected] 22 points 9 months ago

Yes, thanks to all for contributing and assisting. I am grateful for the clarification and leg work. Folks say reddit had this, and lemmy has less, so every time I see it, I make sure to appreciate it.

[–] [email protected] 8 points 9 months ago (1 children)

Am I to understand that the cable use has multiple cores within a single cladding? Interesting approach..

Now we get to classify them as singlemode, multimode, and multiestmode.

[–] [email protected] 1 points 9 months ago

This is really interesting. Thank you for providing good insight!