| Abstrakt: |
Abstract: A spectral interferometric method is used to a direct measurement of the group modal birefringence dispersion in optical fibres with an elliptical core over a wide wavelength range. A tandem configuration of a Michelson interferometer and an optical fibre to be measured and the fact that the spectral interference fringes are resolved at the output of this configuration by a low-resolution spectrometer only in the vicinity of the so-called equalization wavelength are used. Determining the equalization wavelength as a function of the path difference in the interferometer, the spectral dependence of the group modal birefringence in a given optical fibre can be measured directly. Moreover, this contribution shows that by using a polynomial approximation for the measured data, the spectral dependence of the phase modal birefringence in the optical fibre can be determined. |
