The key to the Microsoft research team's breakthrough lies in their novel double-layer nested antiresonant nodeless fiber (DNANF) structure, which is surrounded by a thin, fine silica ring. This structure utilizes the photonic bandgap effect to effectively confine light within an air core, significantly reducing its interaction with the material.

The researchers note that hollow-core fiber not only increases transmission speeds by 45%, but also enables data transmission over longer distances without sacrificing bandwidth. They achieved an attenuation level of 0.091 dB/km at a wavelength of 1550 nanometers, surpassing the theoretical limit of 0.14 dB/km for state-of-the-art silica fiber. This significant improvement represents the first such improvement since the 1980s and has been hailed by the research team as "one of the most noteworthy advances in waveguide technology in the past 40 years."
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