How are multimode fibers classified?

I. How is the classification of multimode fiber? Basically, there are two kinds of multimode fiber, one is graded and the other is stepped. For graded fiber, the refractive index of the core is the smallest at the periphery of the core, and gradually increases to the center, thus reducing the mode dispersion of the signal, while for stepped fiber, the refractive index is basically constant on average, and only on the surface of the cladding will it suddenly decrease. Index) fiber optic cable, the refractive index is basically an average of the same, and only in the cladding (cladding) surface will be suddenly reduced. Stepped fiber generally has a lower bandwidth than graded fiber. In network applications, the more popular multimode fiber is 62.5/125, 62.5/125 means that the core diameter of the fiber is 62.5 μm and the cladding (cladding) diameter of 125 μm, the other more common 50/125 and 100/140.

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