Multimode optical fibers can have a step-index or graded index refractive index profile. Which fiber, multimode step-index or multimode graded-index fiber, usually performs better?

Multimode optical fibers can have a step-index or graded index refractive index profile. Which fiber, multimode step-index  or multimode graded-index fiber, usually performs better?
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Multimode graded-index fiber
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