Here is the link to the September 2018 Company Overview that says.... on page 26 as Oz stated
POET - "Among these companies, we have engaged in discussions with 13, and all continue to be interested in the Optical Interposer to varying degrees.
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https://poet-technologies.com/docs/presentations/POET%20HCW%20Presentation_Sept_2018_anim-vFINAL.pdf