It's in the June 30 news release. The lasers and photodiodes used in the OI will be from Sanan, not DL.
The JV is expected to design, develop, manufacture and sell 100G, 200G and 400G optical engines with customized lasers and photodiodes from Sanan IC combined with optical interposer platform technology from POET.
http://www.semiconductor-today.com/news_items/2020/jun/poet-sanan-300620.shtml