Pulse Dispersion: The broadening or spreading of the output pulse with the time is called pulse dispersion. This can happen due to the different reasons. Let us discuss them one by one:
1. Inter-modal dispersion: The term “Inter-modal” consists of two terms “inter” and “modal”. “inter” means “within different” and “modal” term comes from mode (mode means path followed by the light). Therefore, intermodal dispersion means the dispersion between the different modes of the fiber. Therefore this dispersion can not occur in mono-mode fibers. Thus it can only occur in multi-mode fibers.