Abstract: The intended application of our Different Types of Dispersions in an optical fiber. In this report we discuss about the Optical Fiber and its advantages, Theory and principles of the fiber optics, Fiber geometry, Types of optical fiber, Different parameters and characteristics of fiber are also explained. Fiber has linear and non-linear characteristics. Linear characteristics are wavelength window, bandwidth, attenuation and dispersion. Non-linear characteristics depend on the fiber manufacturing, geometry etc.Dispersion is the spreading of light pulse as its travels down the length of an optical fiber. Dispersion limits the bandwidth or information carrying capacity of a fiber.