Fiber Equation - tunnel with no light

I have my doubts that this makes any sense and that it actually leads down a garden path with no end.

For my computer networking project at college, I've to discuss the types of network media, which respectively are copper and fibre and among others.

I had a burst of creativity and wanted to express how far fibre could send its light pusles and more so how fast.

I figured out that there are 1609.344 metres in a mile and that light travels 186,287 miles per second, so I wanted to express how fast it could send lets say a packet over 5 miles, is this even possible. with future fibre technologies that are being developed..or like I said, am I going in way over my head?

Cheers