Clad portion of single-mode fiber
A cladding mode is a that is confined to the cladding of an by virtue of the fact that the cladding has a higher than the surrounding, which is either air or the primary polymer overcoat. Modern fibers have a primary polymer overcoat with a refractive index that is slightly higher than that of the cladding, so that light propagating in the cladding is rapidly attenuated and disappears after only a few centimeters of. Usually, the cladding is fabricated together with the fiber core by pulling from a fiber preform. 7 % Clad non-circularity measures a fiber's deviation from perfectly round, and is measured as a percentage difference versus.
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