moxam: Am I reading this correct a full transmit/recieve 400G which exptroplates out to 800 1.6 etc.

No, POET Infinity is “a chiplet-based transmitter platform for 400G, 800G and 1.6T pluggable transceivers and co-packaged optics solutions.”

Pluggable transceiver customers can use Infinity chiplets to achieve transceiver solutions by adding receive side components, e. g., from POET Technologies.