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A polarization mode dispersion measurement set-up based on a Mach-Zehnder Interferometer was realized. Measurements were carried out on short high-birefringent fibers and on long standard telecommunication single-mode fibers. In order to ensure high accurate results, special emphasis was placed on the evaluation of the interference pattern. The procedure will be described in detail and practical measurement results will be presented.
In short-reach connections, large-diameter multimode fibres allow for robust and easy connections. Unfortunately, their propagation properties depend on the excitation conditions. We propose a launching technique using a fibre stub that can tolerate fabrication tolerances in terms of tilts and off-sets to a large extent. A study of the influence of displaced connectors along the transmission link shows that the power distributions approach a steady-state power distribution very similar to the initial distribution established by the proposed launching scheme.