POET is supplying an interposer as a platform technology. The devices that go on that interposer will eventually include high powered uncooled continuous wave lasers designed with heat channelled directly through the interposer to the heat sink. Like you see on page 10
https://poet-technologies.com/docs/presentations/2020%20POET%20Annual%20General%20Meeting_FINAL.pdf
Now look at time 1:56 in the CISCO presentation. Interposer (electrical and/or photonic). Lateral layout of the dies on that interposer. Sound familiar.
https://www.youtube.com/watch?v=WtWxqoNmcrQ&feature=youtu.be
Listen to the issues as they are described associated with co-packaged optics. These are issues that POET addresses and more.