Intramodal dispersion, also known as modal dispersion, is a phenomenon that occurs in multimode optical fibers, where signals transmitted over different modes of the fiber arrive at different times. This results from the fact that light can travel through the fiber along various paths or modes, each having a slightly different length and propagation velocity. In multimode fibers, there are multiple paths that the light can take, and these paths can lead to differences in travel time for the light signals.

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