No standard across the board and it being rather challenging to reliably package a Photonic Circuit on Chip into the rest of the required device have always been the key issues. I think the key here though is that we don'yet know the right approach so the former is very much trial and error. We are likely at this stage going to end up with a recommended standard from the company that can shout the loudest, rather than waiting to see which is obviously optimal aka best efficiency in transferring data.

Oh, Advanced Photonics Coalition, not American Power Conversion, the UPS people.

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