Modal dispersion is a distortion mechanism occurring in multimode fibers and other waveguides, in which the signal is spread in time because the propagation velocity of the optical signal is not the same for all modes. Other names for this phenomenon include multimode distortion, multimode. Abstract— The mode-dependent signal delay method can be used for the characterization of modal dispersion of multimode fibers. We revise the formalism used by this method and quantify measurement errors due to receiver thermal noise. axial rays (modes), with the shortest path length, will have the shortest transmission time, while rays entering the fiber at its maximum acceptance angle will travel farther and. The optical fiber is a widely used method for carrying information due to its small size, low linear losses, insensitivity to electromagnetic disturbances, etc.
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