I don't think all Fiber optic is free from the effects of geomagnetic storms like the Carrington event. Lots of "fiber" also has copper along with it for critic

I don't think all Fiber optic is free from the effects of geomagnetic storms like the Carrington event. Lots of "fiber" also has copper along with it for critical telemetry and for powering repeaters placed directly into the cable assembly. If the repeaters burn up, the cable still fails. That being said, if a geomagnetic storm takes out fiber laid on the bottom of the ocean we're probably all going to be needing new chromosomes shortly anyhow.