I have recently come across this idea. It's apparently possible to buy boxes that can convert RF signals into optical signals that can be sent over fiber and reconstructed on the other side with another box. There are converters for one way or transceiver purposes. Some have bandwidths of 2500mhz or even 4000mhz.
Here is a PDF with the basics.
Has anyone ever used something like this for Ham Radio purposes? I'm still looking around but it seems pretty obscure to me still. I'll make a new post if I find anything.