Microsoft targets AI data centre optical bottlenecks with MicroLED

Microsoft Research has developed a MicroLED and imaging-fibre cabling system for data centre connectivity, while Microsoft has also deployed Hollow Core Fibre in some Azure regions. The signal is that AI infrastructure competition is moving into physical-layer networking, where power, latency and distance limits can shape cloud economics.

• MicroLED fills the gap between short copper and laser fibre

• Hollow Core Fibre could extend Azure regions with lower latency

The fact

Microsoft Research's Cambridge lab has developed a MicroLED and imaging-fibre cabling system for data centre connectivity. The design uses thousands of parallel channels, a "wide and slow" approach, to move data across tens of metres, filling the gap between copper cables limited to roughly two metres at high volumes and laser-based fibre. Lab tests and deployment estimates suggest around 50% lower energy use than mainstream laser optical cables. Microsoft has miniaturised the system into an equipment-compatible transceiver with MediaTek and other partners, with commercialisation expected in late 2027.

The Assessment

Microsoft is building new data centre interconnects from the physical layer up. MicroLED could cut reliance on laser optics and ease power and cooling pressure if production economics hold. The company's hollow core fibre targets longer inter-data-centre links with 47% faster transmission and about 33% lower latency than conventional fibre. AI infrastructure competition now runs through cables, optics and regional network design alongside GPUs and cooling.

What to Watch

Watch real-world MicroLED transceiver reliability, manufacturing cost and supplier alignment, plus whether Microsoft keeps MicroLED and Hollow Core Fibre mainly inside Azure or opens them to wider industry adoption.