I guess you had to be there Baba. At that time Nov 15, 2019 POET was still completing the final component (the 8th deliveable which was I think the vertical mirror).

https://agoracom.com/ir/POETTechnologies/forums/discussion/topics/733389-cc-transcript-2-vivek-rajgarhia/messages/2248609 

In January, Poet completed its proof-of-concept project with its existing North American-based networking customer. As previously announced, Poet received orders in 2018 from this customer to provide initial device prototypes of its optical interposer platform to systematically address specific integration requirements under a paid development program. At its annual general meeting in September, the company disclosed that it had successfully completed all but one of an eight-step project and that it expected to complete the final milestone by the end of 2019. Poet recently completed this final deliverable and is now engaged in follow-on discussions aimed at products to be designed, qualified and incorporated into the customer's product portfolio.

"The low loss coupling of light from a laser into our waveguides (which are additionally configurable as coarse wavelength division multiplexing (CWDM) multiplexers or demultiplexers) through passive wafer-scale placement techniques and then into fibre demonstrates the complete functionality of the optical interposer platform technology. Moreover, we believe our wafer-scale integrated athermal CWDM filters represent an industry first," commented Dr. Suresh Venkatesan, chairman and chief executive officer. "With optical losses at a fraction of that of other materials, our waveguides and filters enable the fabrication, assembly and testing of integrated optical engines at wafer scale, providing maximum flexibility across a broad range of applications, from datacom to co-packaged optics."