Original sentence: In fiber optics and other forms of waveguide transmission, multimode distortion  is a distortion mechanism occurring in multimode fibers, in which the signal is spread in time because the velocity of propagation of the optical signal is not the same for all modes.Other names for this phenomenon include intermodal dispersion, modal dispersion, multimode dispersion, intermodal delay distortion, intermodal distortion, and modal distortion.Purists insist on calling this effect an optical distortion, since dispersion is a wavelength-dependant phenomenon; multimode distortion may occur at a single wavelength
Edited sentence: Dispersion is a wavelength-dependant phenomenon, whereas multimode distortion may occur at a single wavelength.In fiber optics, multimode distortion (intermodal delay distortion, intermodal distortion, modal distortion) is a distortion mechanism occurring in multimode fibers, in which the signal is spread in time because the velocity of propagation of the optical signal is not the same for all modes.NBecause of its similarity to dispersion in its effect on the optical signal, multimode distortion is sometimes incorrectly referred to as "intermodal dispersion", "modal dispersion", or "multimode dispersion".Such usage is incorrect because multimode distortion is not a truly dispersive effect