We fabricated a new type of waveguide polarization-independent optical circulator which does not need a polarization-beam splitter. The circulator is based on a non-reciprocal Mach-Zehnder interferometer which consists of two waveguide Faraday rotators, two thin-film half-waveplates and two planar lightwave circuit-type 3-dB couplers. The fabricated circulator provides a 14.0-23.7-dB isolation and a 3.0-3.3 dB insertion loss at /spl lambda/=1.55 μm. This circulator presents a new possibility for developing non-reciprocal devices in the field of integrated optics.
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Sugimoto et al. (1999) studied this question.
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