Hollow core fibres and their applications

• Various different classes of fiber (capillary, ARF and PBGF) each with relative merits and drawbacks for specific applications • Significant progress made over recent years in the development of HCF technology — both in terms of understanding and fabrication • Increasing array of applications, with some e.g. power delivery and high power wavelength conversion, close to commercial deployment • Current losses sufficient for some niche telecoms applications to be considered • Prospects for ultralow loss remain, with new fiber designs and concepts still emerging • An exciting time in the development of the field