As copper interconnects hit their physical limits, NPO is emerging as the practical lifeline for AI compute clusters. Tencent and Alibaba plan to start 3.2T NPO deployment by late 2026, while Huawei proposes a 7.2T spec aligned with GPU roadmaps.

NPO is being treated as a long-term architecture not out of technical preference, but because of supply constraints. Separable architectures create component markets - and whether NPO or CPO wins, the laser stays outside the package.

Chasing every option would force optical module makers to develop more than 50 SKUs. And at 1,024 lanes, OSFP beachfront density is just 0.07 T/mm versus a 0.3 T/mm target — a gap of over 4x. Huawei argues NPO means redesigning the whole switch, from sockets and thermals to PI/SI.

At ECOC 2026, Huawei did something the industry rarely does in public: score NPO and CPO dimension by dimension. NPO won four, CPO two. But the real signal is the ranking, not the score - with supernodes heading to 4,096 accelerators in 2027, "can it be swapped when it fails" is put ahead of "how many pJ per bit it saves" for the first time.