Day, G.W., Payne, D.N., Barlow, A.J. and Ramskov Hansen, J.J.
Faraday rotation in coiled, monomode optical fibres: isolators, filters and magnetic sensors
Optics Letters, 7, (5), . (doi:10.1364/OL.7.000238).
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It is shown that efficient Faraday rotation can be obtained in a fiber coil if the circumference of the coil is exactly equal to the beat length of the birefringence caused by bending. The essential elements of a practical, compact isolator based on this principle are demonstrated. Forty-five degrees of Faraday rotation were obtained in a 40-turn, 15-mm-diameter coil placed in the field of a permanent magnet (~0.29 T). The design of optical filters and magnetic sensors is also discussed.
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