Remarkable recent demonstrations of ultra-low-loss inhibited-coupling(1C)hollow-core photonic-crystal fibres(HCPCFs)established them as serious candidates for next-generation long-haul fibre optics systems.A hindrance...Remarkable recent demonstrations of ultra-low-loss inhibited-coupling(1C)hollow-core photonic-crystal fibres(HCPCFs)established them as serious candidates for next-generation long-haul fibre optics systems.A hindrance to this prospect and also to short-haul applications such as micromachining,where stable and high-quality beam delivery is needed,is the difficulty in designing and fabricating an IC-guiding fibre that combines ultra-low loss,truly robust single-modeness,and polarisation-maintaining operation.The design solutions proposed to date require a trade-off between low loss and truly single-modeness.Here,we propose a novel IC-HCPCF for achieving low-loss and effective single-mode operation.The fibre is endowed with a hybrid cladding composed of a Kagome-tubular lattice(HKT).This new concept of a microstructured cladding allows us to significantly reduce the confinement loss and,at the same time,preserve truly robust single-mode operation.Experimental results show an HKT-IC-HCPCF with a minimum loss of 1.6dB/km at 1050 nm and a higher-order mode extinction ratio as high as 47.0 dB for a 10 m long fibre.The robustness of the fibre single-modeness is tested by moving the fibre and varying the coupling conditions.The design proposed herein opens a new route for the development of HCPCFs that combine robust ultra-low-loss transmission and single-mode beam delivery and provides new insight into IC guidance.展开更多
基金This work is funded through the PIA 4F project and the region of Nouvelle Aquitaine.
文摘Remarkable recent demonstrations of ultra-low-loss inhibited-coupling(1C)hollow-core photonic-crystal fibres(HCPCFs)established them as serious candidates for next-generation long-haul fibre optics systems.A hindrance to this prospect and also to short-haul applications such as micromachining,where stable and high-quality beam delivery is needed,is the difficulty in designing and fabricating an IC-guiding fibre that combines ultra-low loss,truly robust single-modeness,and polarisation-maintaining operation.The design solutions proposed to date require a trade-off between low loss and truly single-modeness.Here,we propose a novel IC-HCPCF for achieving low-loss and effective single-mode operation.The fibre is endowed with a hybrid cladding composed of a Kagome-tubular lattice(HKT).This new concept of a microstructured cladding allows us to significantly reduce the confinement loss and,at the same time,preserve truly robust single-mode operation.Experimental results show an HKT-IC-HCPCF with a minimum loss of 1.6dB/km at 1050 nm and a higher-order mode extinction ratio as high as 47.0 dB for a 10 m long fibre.The robustness of the fibre single-modeness is tested by moving the fibre and varying the coupling conditions.The design proposed herein opens a new route for the development of HCPCFs that combine robust ultra-low-loss transmission and single-mode beam delivery and provides new insight into IC guidance.
