Confinement refers to the amount of the core which is doped. Fibercore fabricate doped fibers with uniform doping across the core, so confinement factor is unity. Some fiber designs have only part of the core doped, such as a small doped region in the centre of the core, or a doped ring within the core.
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Related Terms: Bend Edge, Bend Induced Loss, Confinement Factor, Core, Doping Density, Mode Field Diameter (MFD), Numerical Aperture (NA)