Just to add to this I would expect this also be also true for the much shorter range CWDM4 which does not require as tight a wavelength spacing (thus the shorter reach). Thus the production ready Beta samples follow closely behind the Alpha and production follows closely behind the Beta samples as per page 18 of the last presentation.
https://poet-technologies.com/docs/presentations/POET-Technologies-OTC-Virtual-Technology-Conference-15APR21.pdf