"noise cannot travel over light". Huh? Fiber optic, like any other medium, transmits what is put in. Garbage in, garbage out. One downside of fiber optic is the signal has to be converted to light and then back to copper so 2 steps are added where noise or signal degradation could occur. So fiber optic may add noise to the system. I like keeping it as simple as possible. I know there are a lot of people in favor of fo. they either sell it or have bought it.
Jerry