Fabian فابيان(@iamfabian):For those who don't know, the Open CPX MSA is standardizing the electrical/mechanical/optical interface for compact CPO engines like Lightmatter’s Passage L20 so vendors can place high BW optical I/O very close to the XPU and use it for scale-up fabrics without every accelerator platform needing a proprietary optical engine implementation. Sp for scale-up specifically, it offers shorter electrical reach + optical links right beside the accelerator which translates to more bandwidth density and lower I/O power across large multi-XPU systems.

2026.09.17 23:01

For those who don't know, the Open CPX MSA is standardizing the electrical/mechanical/optical interface for compact CPO engines like Lightmatter’s Passage L20 so vendors can place high BW optical I/O very close to the XPU and use it for scale-up fabrics without every accelerator platform needing a proprietary optical engine implementation. Sp for scale-up specifically, it offers shorter electrical reach + optical links right beside the accelerator which translates to more bandwidth density and lower I/O power across large multi-XPU systems.

Lightmatter@LightmatterCo

2026.09.17 14:18

Cabling bottlenecks are holding AI scale-up back. Today, we joined the Open CPX MSA and unveiled Passage L20 CPX, the industry’s first bidirectional (BiDi) Open CPX optical engine. -12.8 Tbps total bandwidth (Tx+Rx) - Cuts AI scale-up cabling & connectors by 50% - BiDi technology combines transmit & receive on a single fiber Co-packaged optics is the future of AI scaling, and CPX is the on-ramp to production. Read the full announcement: #Photonics# #AIInfrastructure# #OpenCPX# #NearPackagedOptics#