HP CTO on a similar topic
Specifically using optics all the way down to the server level
long speech, though all good here is a link to that particular segment:
(if youtube doesn't jump straight to the segment just skip to 18 min 45s into it)
"Copper is the energy sucking devil"
"Our math tells us we will use 16,000 times less energy per bit to process by moving from pure copper based systems to photonic based systems"
A current example he used was a 6Tbps fiber cable, vs a handful of copper cables that can do 300Gbps.
cool stuff, at least to me.