Open optical moves the integration risk. To you.
Disaggregation cuts capex and vendor lock-in. It also relocates a risk that used to be priced into the OEM's margin.
In a closed optical system, one vendor owns the line system, the transponders and the blame. When AT&T and Deutsche Telekom report capex reductions of a quarter to two-fifths from open line systems, the saving is real, but so is the transfer: multi-vendor interoperability risk now sits with the operator.
Coherent pluggables sharpen the point. A 400ZR module in a router is a wonderful thing until the question becomes whose OSNR model decides whether the path closes: the router vendor, the line-system vendor or nobody.
The answer has to be a physical-layer authority that owns the budget across the seams. Quality-of-transmission modelling in the GNPy tradition, engineered margins per span, and interoperability assumptions written down where an assurance body can challenge them.
This is where mission-critical operators should be most careful. Rail and utility bearers live for decades and carry traffic whose failure modes are measured in safety cases, not service credits. Open optical is compatible with that world, but only with the integration engineering made explicit.
Our position is straightforward. Disaggregation is usually the right commercial call, and it raises rather than lowers the value of independent design. Someone has to sign the end-to-end budget, and it should be someone with no line card in the fight.