Couldn’t they use fiber optic connections to realistically remove the overhead of the interconnect communication?

I saw a demo from Kodak once where they printed a fiber optic backed motherboard and it was lightning fast even when they increased distance. No clue what the heck happened to that tech but I do recall one of the folks giving a lengthy explanation about how fiber optics could replace some of the metal used in cpus because they could make microscopic glass

Edit: turns out I was on to something with this, there is work being done on this exact problem[0]. I still wonder WTF happened with that Kodak tech though

[0]: https://spectrum.ieee.org/amp/optical-interconnects-26589434...