Apparatus and method for measuring chromatic dispersion distribution

摘要

A chromatic dispersion distribution measuring apparatus which can determine a sign of a dispersion value, and a measuring method thereof. The chromatic dispersion distribution measuring apparatus comprises: a plurality of light sources (1-4) for emitting lights having different wavelengths; an intensity measuring section for measuring a light intensity of a four-wave mixed light caused by any two lights, as a function of a transmission distance; a chromatic dispersion calculating section for calculating a chromatic dispersion value of the optical device, in accordance with the light intensity; a time measuring section for measuring a propagation time of a reflected light caused by each light; and a sign determining section for determining a sign of the chromatic dispersion value of the optical device, on the basis of two different chromatic dispersion values and two propagation times of reflected lights of two lights related to the two chromatic dispersion values. <IMAGE>