Patent ID: 7126679

Claim:
A polarization mode dispersion measuring device for measuring polarization mode dispersion of an device under test comprising: a polarization separating means for receiving light having emitted from said device under test, separating said received light into p-polarized light and s-polarized light, and outputting the p-polarized light and s-polarized light; a light generating means for generating incident light; an optical modulation means for applying said incident light with intensity modulation, and emitting modulated light; a light input means for making said incident light having been applied with the intensity modulation in line with orthogonal polarization axes which are said p-polarization axis and said s-polarization axis in said polarization separating means rotated by a predetermined angle, and then, making the resulting incident light incident to said device under test; a measuring means for measuring phase shift equivalent values and amplitude equivalent values of said incident light based on the output of said polarization separating means; and a polarization mode dispersion measuring means for measuring the polarization mode dispersion of said device under test based on the measurement result of said measuring means.