An optical isolator employing a nonreciprocal guided-radiation mode conversion is described. The optical isolator composes of a magneto-optic waveguide with a Si guiding layer, which can be realized by photosensitive adhesive bonding. The optical isolator was designed at a wavelength of 1.55 μm. Relationship of waveguide parameters was clarified for isolator operation. Dependence of the thickness of an adhesive layer was investigated for the design of the optical isolator.
An optical isolator with a (CeY) 3 Fe 5 O 12 guiding layer employing TE-TM mode conversion was investigated. The optical isolator consisted of a nonreciprocal polarization rotator and a reciprocal polarization rotator. The reciprocal polarization rotator was realized by inserting a polyimide halfwave plate into a groove in the magnetooptic waveguide. Propagation distances required for the nonreciprocal polarization rotator were calculated at a wavelength of 1.55 µm. Diffraction loss due to the insertion of the half-wave plate was also calculated. The reciprocal polarization rotator integrated with a spot-size converter was proposed for suppressing the diffraction loss. By introducing the spot-size converter for an input facet and an output facet of the half-wave plate, a calculated total insertion loss was reduced to 0.22 dB.
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