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Is it possible to embed optic fibers and optoelectronic gates along with semiconductor gates? How is the fabrication process different? Probably there are size limitations due to fiber width and paths?

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This is a very active area of research. It's quite technical though so it takes a good amount of study to get into it.

https://en.wikipedia.org/wiki/Silicon_photonics https://en.wikipedia.org/wiki/Integrated_quantum_photonics

I'm not very familiar with the details, but I know this is an active area of research. Generally you use a process thats conducive to optics (like SOI), you fab the regular silicon in some areas, and you have separate process steps to build the optical devices.

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