Finally an interesting paper from Marvell about the subject. 

Why is this revelant? Because it is proof (to me at least) that the path taken by POET with its interposer platform approach is indeed what top-players like marvell at looking at. 

Source for the parer : https://www.marvell.com/content/dam/marvell/en/public-collateral/phys-transceivers/marvell-25d-heterogeneous-integration-for-silicon-photonics-engines-in-optical-transceivers.pdf

Don't get me wrong, POET's plarform is hybrid and not an heterogeneous like Marvell.

Hybrid vs heterogenous : https://prod5.assets-cdn.io/event/3296/assets/8460151287-0b75726b81.pdfr