an apparatus for measuring characteristics of chromatic dispersion includes a raman oscillator generating a laser pulse with wide band wavelength . the laser pulse generated by a raman oscillation is transmitted through a selection and reflection film and then through a sample fiber . at an output end of the sample fiber , a reference wavelength light and an object wavelength light are received so that a delay time of the object wavelength light relative to the reference wavelength light is measured as a factor of a chromatic dispersion of the sample fiber .