The in-line fibre-optic polarisation analyser enabling measurement of full polarisation parameters of light propagated in optical fibre is presented in the paper. This device uses a standard single-mode optical fibre in a system of the polarimetric configuration. Introduction of controlled birefringence in such a fibre and application of an appropriate polariser set at the end of the system allow to get full information about polarisation parameters to obtain. Evaluation of any changes of the state as well as the degree of polarisation have been achieved by application of an appropriate detection system and numerical calculation based on the coherence matrix theory. Finally, some experimental results of the system performance and determination of the main errors are presented.
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