You are right, there is a definitely a cascade effect, which I haven't accounted for.

Such effect stipulates that 1W of power savings at the server level results in 2.4 to 3.3W of power economy down the line.

PLease note that at the network level, a lot of power is simply loss because actual transceivers are always on idle (power on)

and

POET implements a new paradigm for lasing utilizing a new laser structure in the form of a digital opto-electronic switch (DOES).