Chromatic dispersion measurements of long optical fibers by means of optical ranging system using a frequency-shifted feedback laser

In this paper, we describe the experimental results on the chromatic disper sion measurement of long optical fibers by means of optical ranging system using a wavelength-tunable frequency-shifted feedback (FSF) laser. The opti cal ranging system using an FSF laser has high spatial resolution of severa l centimeter over 10-km measurement range, and then the dependence of the g roup delay time of the lightwave in the optical fibers on the wavelength ca n be directly measured. The chromatic dispersion and the zero-dispersion wa velength of an 80-km-long dispersion shifted fiber was estimated, which are in good agreement with the result by the phase method.