A fiber-embedded optical isolator with a low forward loss has been developed. The isolator consists of thermally diffused expanded core fibers, laminated polarizers, and a Faraday rotation garnet. Backward and forward losses at 1.3 mu m wavelength are 44.0 and 0.9 dB, respectively. The isolator has a minute size, and its alignment is simple.>
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Shiraishi et al. (1991) studied this question.
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