We know they were/are using BAE for some foundry services as well.
From their March 30 2015 press relase....
POET Technologies Inc. (the “Company”) signed a contract with BAE Systems under which BAE Systems will provide non-exclusive third-party foundry services in support of the Company’s “Lab-to-Fab” transition plan. The current phase of the work will be performed between March 2015 and August 2015. Key objectives of the collaboration include process transfer, prototype builds and design enablement kit development.