Thanks Derek,
Some simples figure to explain it:
![]()
And now, remenber that December 2015 article in Nature journal, see the optical amplifiers before the receivers ?!? (sorry for image clarity)
![]()
The other questions that was debated about this article, was that we don't know if the laser in an on of off-chip solution and it is a VCSEL (low-powered) of not?
http://www.nature.com/nature/journal/v528/n7583/abs/nature16454.html