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Small optical isolators for longer wavelengths are fabricated. The isolator consists of a Gd3−xBixFe5O12 single crystal and small polarizers composed of metal–dielectric mutlilayers. The isolator for λ = 1.29 μm has a backward loss of >28 dB with a forward loss of 1.9 dB, and that for λ = 1.52 μm has a backward loss of >31 dB with a forward loss of 1.1 dB, where Fresnel reflection losses are not included.
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Shiraishi et al. (1986) studied this question.
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