Science Daily  July 3, 2023 Antiresonant, hollow-core optical fibers are currently challenging or even exceeding the loss performance of conventional solid-core fibers. Researchers in the UK have shown that the glass elements of the cladding structure with an approximately radial orientation play a crucial role in determining the confinement loss by strongly shaping the wave fields in the azimuthal coordinate. Azimuthal confinement can result in an evanescent field in the radial direction through the cladding, leading to a confinement loss that is substantially lower than would be the case without azimuthal confinement. They developed a comprehensive theory of azimuthal confinement, […]