I did consider the possibility of tapping signals using the EMI from the repeaters and amplifier pumping lasers. But an OFC carries an incredible amount of data

I did consider the possibility of tapping signals using the EMI from the repeaters and amplifier pumping lasers. But an OFC carries an incredible amount of data over several individual fibers. And each individual fiber carries several channels using multiplexing (WDM). I don't think that their timing is synchronized either. In short, I find it hard to believe that these signals can be practically tapped from the EMI from the supporting systems. Of course, I could be completely wrong. I wouldn't mind being proven with any sort of relevant literature.