A method to miniaturize the Faraday rotator for an optical isolator is proposed. The rotator includes a half-wave plate, and magnets arranged with alternating polarities are used. The principle of operation of the rotator is confirmed by measurements. An isolator employing the rotator has a backward loss of 32 dB and a forward loss of 0.65 dB at 0.633-μm wavelength, where the forward loss is mainly due to Fresnel reflection losses.
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Shiraishi et al. (1986) studied this question.
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