Yes indeed, I first came across fibre optics in 1992 when involved with commissioning a new sub-sea high voltage control system in the petro-chemical industry where the fibres where actually incorporated within the 33 Kv. inter platform feeder, was absolutely facinated observing the termination process.
Of course, totally electrical "noise" immune which was one of the advantages over the old co-axial highways.
I'am sure the technology has advanced a lot since then.
I first came across 'Fibre' in 1970, I still have an off cut somewhere, it was about 4mm dia hard plastic tube with many glass firbe strands and terminated in a brass feral of about 5mm dia, that was one fibre
Yes it was made of many strands of glass but it was early technology back then.
A smaller type was a 'Plastic' core type we tested, it had a plastic sheath of about 3mm with a 'Plastic' (fibre) strand core of about 1.5mm.
I used to cycle to work then and I used an 'Off Cut' on my bike, one end in the rear red light and the other end on my handle bars , I could just glance down to check my rear light was working on dark nights.
I worked in Railway Research and we used the fibre to Isolate between the 25Kv overhead train power on the pantograph for instrumentation on the pantograph.
We tested some of the more modern type of fibre when it was in it's early days of use and development, way before BT started using it.