Hollow-core optical fibers (HCFs) have unique properties like low latency, negligible optical nonlinearity, wide low-loss spectrum, up to 2100 nm, the ability to carry high power, and potentially lower loss then solid-core single-mode fibers (SMFs). For decades, optical fibers have relied on a solid glass core to guide light and have formed the backbone of global telecommunications. However, glass imposes a fundamental physical limitation because light travels through it approximately 30 percent slower than through air. These features make them very promising for. We make extensive use of analytical and computational models to design, fabricate and understand our fibres. Express 2015, 23, 14002–14009 M. Alkeskjold, "Hollow-core fibers for high power pulse delivery," Opt.