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.

After 1.6T there is no single winner: every reach has its own lowest-power answer. Two companies on this panel gave the same number — the reverse gearbox feeding slow-and-wide optics costs 4 pJ/bit, more than the optics themselves. And Oracle's field data pulled the spotlight back to the 4,096 fiber contacts on a front panel.

Scoring three architectures on the same criteria, Ciena shows single-vendor CPO going from second-best to best on technology, but from efficient to at-risk on supply chain, because the ASIC and interconnect are sold as one unit. Open CPX's answer is not a better component but a socket that optics and copper share, and a spec written in under six months.

At ECOC 2026, Coherent skipped the CPO sales pitch and brought a working machine: a 6.4T NPO with its own ELSFP at 4.7 pJ/bit — laser included. LightCounting puts the crossover at 2031. The CPO debate is over; what remains is a fight over the slope.

Edgecore admitted 1.6T LPO is "not yet successful," so the stopgap is gone and CPO can no longer wait a generation. Three MSAs at OFC 2026 push CPO toward swappable engines, while SONiC only now has the models it needs. Hardware decides who ships; software decides who deploys at scale.

The light-source race has switched tracks: it's no longer about whose laser is brighter, but who can make billions of them by 2030 without spending 5 minutes of active alignment on each. At ECOC 2026, two sessions and 11 speakers delivered eight technology paths and an 18 dB bill.

CPO's decade-long stall was never about the optics — nobody dared lock down the mechanical interface. Open CPX 1.0, with 200 pins, ±30 µm tolerance and 60 N insertion force, turns the optical engine into a pluggable part. Once the interface is standardized, orders shift from design wins to part numbers.