Abstract

The performance of optical fibre Faraday current sensors in often limited by both the intrinsic birefringence and the bend-induced linear birefringence inside the fibre.^{[1, 2]} High Verdet constant bulk-glass current sensor do not subject to these problems.^[3] However there are problems arise in designing closed loop bulk glass sensing elements, as additional phase shifts occur as a result of internal reflections, and also the light beams must undergo to follow a closed path.^[4]

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