Modal disperson

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 dispersion
  • modal distortion
  • intermodal distortion
  • intermodal dispersion
  • intermodal delay distortion

Source: https://en.wikipedia.org/wiki/Modal_dispersion