I am kind of awaiting some news about more breakthroughs in DWDM technology and clicked through thinking this might be related. All I could tell immediately was that it was code of some description. I really detest when higher level stuff steals terminology from lower level protocols. I feel like they could have found a better term than fiber.

To be fair, "fiber" is a pretty well known term in the context of concurrency. The post author did not make it up.

What an awful choice of terminology though - it’s almost designed to be confusing to anyone outside the space.

Maybe, but "thread" is a widely accepted term even though it's closely related to "fiber" both in concurrency (coop/preempt multitask) and general day-to-day sense (textile).

In cases like this it helps to navigate to the homepage of the website. With one click on the header link, you find out that this is about Ruby and some http server.

It's Ruby, if that's helpful.

Glad I'm not the only one