1147
They Need To Stop Doing This
(kerala.party)
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Looks like it comes in spools.
https://www.ixblue.com/store/ixf-hcf-10-100-950/
I don't know the physics of it. I posted some info for the parent you responded to. My understanding is the applied physics is different from traditional fiber.
https://mpl.mpg.de/research-at-mpl/russell-emeritus-group/research/about-pcf/hollow-core-pcf