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Polarisation mode dispersion measurements based on optical heterodyne detection are demonstrated. Using the detection technique, length dependence of group delay difference between two orthogonally polarised HE11 modes in an elliptical-core fibre was measured at a wavelength of 1.3 μm. The modal dispersion was found to depend linearly on length in the range of 0–500 m for a fibre with modal birefringence of 1.5×10−5.
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Shibata et al. (1984) studied this question.
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