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A novel optical isolator consisting of an yttrium-iron-garnet (YIG) sphere and two PANDA-fibre polarisers is reported. The YIG sphere functions not only as a Faraday rotator but also as an efficient coupling lens. The extinction ratio of the PANDA-fibre polariser was 37 dB when the 3 m-long fibre was coiled by the diameter D = 21 cm. The isolation ratio was 34.7 dB at 1.3 μm wavelength with the insertion loss of 4.1 dB through the PANDA-fibre polariser to the analyser.
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Okamoto et al. (1985) studied this question.
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