We aren’t talking about long distance and coherent here but direct detect. Coherent is not cost or power competitive with direct detect for short reaches yet.

We aren’t talking about long distance and coherent here but direct detect. Coherent is not cost or power competitive with direct detect for short reaches yet. When I talk about SERDES I’m talking about the electrical signal interface to the optic. Also it’s worth noting that the majority of coherent DWDM interfaces are some kind of embedded optic already.