You can buy power over fiber systems, but they are not cheap!
Last I checked it was something like $100/watt and was 10-25% efficient (plug-plug). The system I worked on used “standard” fiber as the hollow core stuff still had too many drawbacks.
I have been wondering about doing power over fiber for sensors, where they don't need much power, but do need an interference free supply. It seems like a good use case as you could presumably put a sensor at the end of a single fiber, then send power up and get data back down.
