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Determination of Birefringence Configuration in Single-mode Fiber Systems through Backscattering Signal Analysis

We propose a method to analyze the evolution of the states of polarization measured by polarization optical time domain reflectometry. This method allows to obtain detailed information about the configuration of birefringence, which is present in the single-mode optical fiber system during the measurement. We include precise twist effects into the formalism. Long fiber systems can be modeled as concatenated wave plates, and the configuration is characterized by a data set corresponding to birefringence strength and eigenpolarization direction of these wave plates.