Remarkable recent demonstrations of ultra-low-loss inhibited-coupling (IC) 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 1.6 dB/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.

最近的超低损耗抑制耦合（IC）中空光子晶体光纤（HCPCF）的显着证明使它们成为下一代长距离光纤系统的重要候选者。对于这种前景以及短程应用（例如需要稳定，高质量光束传输的微加工）的障碍是，设计和制造结合超低损耗，真正坚固的单根光纤的IC导引光纤的困难。适度和极化保持操作。迄今为止提出的设计解决方案需要在低损耗和真正的单模之间进行权衡。在这里，我们提出了一种新颖的IC-HCPCF，以实现低损耗和有效的单模工作。光纤具有由Kagome-管状晶格（HKT）组成的混合包层。这种微结构化包层的新概念使我们能够显着减少限制损耗，同时保持真正可靠的单模运行。实验结果表明，对于10 m长的光纤，HKT-IC-HCPCF在1050 nm处的最小损耗为1.6 dB / km，高阶模态消光比高达47.0 dB。通过移动光纤并更改耦合条件来测试光纤单模的鲁棒性。本文提出的设计为HCCPF的开发开辟了一条新途径，该途径结合了强大的超低损耗传输和单模光束传输，并为IC指导提供了新的见识。在1050 nm处为6 dB / km，对于10 m长的光纤，更高阶的模式消光比高达47.0 dB。通过移动光纤并更改耦合条件来测试光纤单模的鲁棒性。本文提出的设计为HCCPF的开发开辟了一条新途径，该途径结合了强大的超低损耗传输和单模光束传输，并为IC指导提供了新的见识。在1050 nm处为6 dB / km，对于10 m长的光纤，更高阶的模式消光比高达47.0 dB。通过移动光纤并更改耦合条件来测试光纤单模的鲁棒性。本文提出的设计为HCCPF的开发开辟了一条新途径，该途径结合了强大的超低损耗传输和单模光束传输，并为IC指导提供了新的见识。