But now, researchers from the University of Southampton and Microsoft claim to have made a breakthrough in HCF design in a recently published study in Nature Photonics. The new fiber achieves a record low loss of 0. 091 dB/km at 1,550 nm, compared to a 0. 14 dB/km minimum loss for. Another option is the hollow-core fiber (HCF), which theoretically allows for faster speeds due to the ability of light to travel faster through air than through silica. Still, scientists struggled to design HCFs that actually performed better than silica-based cables. 1 dB/km and expands bandwidth, promising faster, cheaper, and more energy-efficient data networks. Microsoft has achieved a breakthrough in the hollow core fiber technology, reducing data transmission. Microsoft-backed researchers have achieved a record-low signal loss in hollow-core optical fiber, marking the most significant advance in waveguide technology in decades. The findings, published on September 1 in the prestigious international journal Nature Photonics, mark a. Published in Nature Photonics earlier this month, the breakthrough introduces a fibre that guides light through a hollow core of air, rather than traditional solid glass, achieving the lowest signal loss ever recorded and enabling faster, more energy-efficient data transmission over long distances.