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We report on hollow-core Kagome fiber with a record loss of 70dB/km and operating at ∼800nm. We show experimentally that the bending-loss is limited by coupling between the guiding core mode and the modes in the cladding holes.
A Kagome-lattice hollow-core photonic crystal fiber with a hypocycloid-shaped core enhances the coupling-inhibition between the core- and cladding-modes, thus providing an optical attenuation <;250dB/km. This rivals the state-of-the-art photonic bandgap hollow-core fibers is demonstrated.
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