system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Fiber optical cabling. Specifically, how data is managed to be transferred through a beam or two of light. 

I understand what fiber optic cabling is, and that it uses light as a way to transfer data. I'm pretty sure I get what it's made out of. What I don't understand is how one day, somebody just said "wait a minute, we can transfer all of these bits through a beam of light. Fuck that copper cabling stuff." I'm studying networking at the moment and this is just one of those things that gets more mind blowing every time I think about it.
gpt
Its not a solid beam of light, its lots of pulses of light and they can put many streams on one cable using different wavelengths.

Edit: like using a flashlight to transmit morse code, but really really fast.  On for 1, off for 0.