Normalised frequency dependence of polarisation mode dispersion due to thermal-stress-induced birefringence in an elliptical core single-mode fibre

Wavelength dependence of polarisation mode dispersion in an elliptical core single-mode fibre was measured by a spatial technique based on the visibility maximum position measurement in the 0.67¿1.25 ¿m wavelength region. Normalised frequency dependence of the modal dispersion due to thermal-stress-induced birefringence was clearly obtained from the measurement and numerical calculation of normalised delay time difference using the point-matching principle.