Hollow core fiber (HCF) is exactly that - rather than a core formed of soliid glass, the core of hollow core fiber is empty except for an inert gas. The reason it exists is that a gas has a lower index of refraction than glass so light travels about 50% faster and can have much less attenuation. These properties include exceptionally weak nonlinear optical effects, high damage thresholds for ultrashort pulses, extremely low end reflections, and the potential for. An empty optical fiber (HCF) is the latest type of optical cable., it is primarily responsible for the waveguiding effect. ) In the case of active fibers, it also provides amplification of light.
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