The book titled "Polarization and Interferometric" have made an attempt to know and rectify that the phenomenons that takes place against to the light, for the light and of the light. That is known as dispersion. Several dispersion Effects or encountered by the pulse of light propagation through a fibre and these acts to spread out of the Pulses in the time domain by changing the shape of the pulse. As a result pulses may be got merged in the previous or in the succeeding pulses became indistinguishable at the receiver end.