Low-loss single-mode hybrid-lattice hollow-core photonic-crystal fibre

Abstract

Hollow-core photonic crystal fibres: Low loss with hybrid-lattice cladding A hybrid microstructured cladding significantly reduces confinement loss and preserves single-mode operation in hollow-core photonic crystal fibres. The hybrid cladding was conceptualised and designed by Fetah Benabid of XLIM Institute, CNRS, and colleagues in France and Italy. It is made of an inner cladding of six tubes connected to an outer basket weave-like ‘Kagome’ lattice via a number of small, thin tubes. Hollow-core photonic crystal fibres surrounded by this hybrid cladding demonstrated a minimum loss figure of 1.6 decibels per kilometre at wavelengths of 1050 nanometres with robust single-mode operation in a ten-metre-long fibre. The design demonstrates the concept’s potential for single-mode waveguides and could contribute towards realising the next generation of long-haul optical fibres.