I feel the same way about how fiber optics can create bandwidth by just slicing up the spectrum for different channels of data (my rudimentary understanding anyway). I like how even after all this time we find new and clever ways to work with light.
Even more wild than spectrum slicing is polarisation encoding multiple data streams on the same wavelength.
loading story #50429541
And then doing amplification on that light without converting it back to electrical signals.
fiber optics doesn't slice up anything. it's just a pathway for light to travel.
Wavelength-division multiplexing[1]... it's what they use with fiber-to-the-home to get bidirectional signals with a single strand of fiber. Or the big-boy version is DWDM which ISPs use to stuff dozens of customers on a single strand.
You might also be interested in https://phys.org/news/2026-11-air-holes-silicon-wafers-flat....
[1] https://en.wikipedia.org/wiki/Wavelength-division_multiplexi...