| 摘要 |
PROBLEM TO BE SOLVED: To provide a polarization mode dispersion measuring system capable of measuring differential group delay (DGD) of a light signal transmitted through an actual transmission line. SOLUTION: A polarization mode dispersion measuring system 10 comprises: a wavelength-tunable optical filter 11 that inputs an optical modulation signal which is light to be measured and that extracts a light signal component of a predetermined wavelength from the optical modulation signal; a Stokes signal detection part 20 for detecting a Stokes signal which is the light signal component extracted by the wavelength-tunable optical filter 11; and a signal processing part 12 for calculating Stokes parameters (S<SB>0</SB>, S<SB>1</SB>, S<SB>2</SB>and S<SB>3</SB>) of the light signal component of at least three wavelengths that are different from one another based on the Stokes signal and then calculating DGD based on the rotation angle of a circular arc drawn on the Poincare sphere by the calculated Stokes parameters of the light signal component of the three wavelengths. COPYRIGHT: (C)2008,JPO&INPIT
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