So Rainer wrote:

And here’s where POET Technologies is part of: “With a robust ecosystem of design partners and tier 1 supply chain, ready to scale, this innovation substantially reduces the total cost of ownership, finally paving the way for profitable generative AI business models.”

And I want to add to that some quotes from POET's news releases from 2022 and 2023:

“The customized Optical Interposer platform that we have co-developed with POET is among the most advanced of its kind in high-speed computing,” said David Lazovsky, founder and CEO of Celestial AI.  “POET’s Light Engines provide us with precision optical power sources in a highly integrated form factor that meet the requirements for our Orion AI accelerator products.” https://poet-technologies.com/news/2022-feb-10.html

AND

"“POET’s Starlight chips and its technology roadmap are complementary to our advanced silicon photonics and system-in-package technologies,” said Preet Virk, Co-founder and COO of Celestial AI.  “We are pleased to continue our collaboration with POET Technologies, building on its optical interposer technology to enable us to meet our performance, scale, and cost targets.”" https://www.globenewswire.com/news-release/2023/04/25/2653733/0/en/POET-Technologies-Introduces-POET-Starlight-for-the-Artificial-Intelligence-Market-and-Receives-Advanced-Purchase-Order-from-Celestial-AI.html