I would suggest looking at the ADVA Optical Networking website. Their sales are growing nicely, but they ran into the trouble with net margins as so many others did in the first 9 months of 2022.

The ultimate parent company is Advant Holdings and is traded here; it's stock performance seems pretty stable the last 5 years. Poet survived as a customer notwithstanding the change in Ownership last year. Could easily be that ADVA and Advant were very much related already, though. 

ADVA's sales are mostly in Europe, the ME and Africa. Selling some in NA now, too. Sales of over a billion in 2022. So a German company. Serious sounding business. Might not be household name, but there might be some tech investing funds that hold it in high regard. We will see a partial answer to that tomorrow, apparently.