A shift transmission in a single mode optical fiber by using standard optical fiber Corning® SMF-28e+® has been simulated. The radius of fiber is varied from 1.1 μm – 4.1 μm. The core radii are 5.1 μm 3.1 μm, 2.1 μm and 1.1 μm. The method used is OptiFiber Software to calculate the mode waveguide dispersion, material dispersion and total dispersion. The results showed that the core ra…