The measurement accuracy of polarization cross-coupling strength based on white-light interferometry
obviously decreases in long-distance polarization maintaining fiber (PMF), due to the difference of
dispersion between two eigenmodes (birefringence dispersion). In this paper, we demonstrate a
bidirectional measurement method with the scheme including a polarization maintaining coupler, a
magnetic optical circulator and an Optical Coherence Domain Polarimeter (OCDP). The experiment
setup and results are described in detail. The cross-coupling distribution results from each direction
measurement were processed to mitigate the influence of dispersion. The compensation is conducted on
coupling strength results, instead of raw interference signal in traditional method. The method saves the
investigation of birefringence dispersion coefficient and light source parameters compared with
compensation in frequency domain. Our experiment with a PMF coil of 200m length demonstrates the
effectiveness in improving strength accuracy with absolute deviation less than 0.31dB, and spatial
resolution recovered to 8.4cm.
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