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A 1.5-µm nonreciprocal-loss waveguide optical isolator having improved transverse-magnetic-mode (TM-mode) isolation ratio was developed. The device consisted of an InGaAlAs/InP semiconductor optical amplifier waveguide covered with a ferromagnetic epitaxial MnSb layer. Because of the high Curie temperature ( T c =314 °C) and strong magneto-optical effect of MnSb, the nonreciprocal propagation of 11–12 dB/mm has been obtained at least up to 70 °C.
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Amemiya et al. (2008) studied this question.
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