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In this paper a low-cost all-fiber current sensor is described that fulfills the requirements of robustness, sensitivity,\udaccuracy and cost required for the monitoring of catenary current in changeover sections of the high-speed railway\udnetwork. Its optical configuration is simplified through the use of few devices with extremely simplified alignment. This\udallows high sensitivity for low current values and a resolution below the ampere level. The sensing head is packed in a\udcompact box withstanding temperature and position variations without affecting the sensitivity of the set-up. The\udelectronics incorporates self-referencing that makes it robust to small misalignments and power variations in the optical\udsource. Field tests will be reported in the conferenc

Low-cost self-referenced all-fibre polarimetric current sensor for the monitoring of current in the railway catenary