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A new method for alignment of polarization-maintaining (PM) fibers has been developed that solves alignment problems with low-contrast PM fibers. It provides a fast and accurate universal method for PM fiber alignment.

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A new method based on the fiber microdeformation theory and image processing techniques has been developed to estimate splice losses of single-mode fibers for fusion splicers. The method is to be found more accurate than the conventional butt-joint approximation, especially when the core deformation is relatively large near the splice point. More than 2000 splice tests have been made. Correlations between the estimations and the measurements under different conditions are illustrated.