K. Iiyama et al., Chromatic dispersion measurements of long optical fibers by means of optical ranging system using a frequency-shifted feedback laser, IEEE S T QU, 7(3), 2001, pp. 484-489
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.