摘要 |
An optical isolator is constituted by providing a substrate, a waveguiding layer lattice-matched to the substrate, and a non-reciprocal phase shifter, and a waveguide and a curved waveguide for guiding the waveguiding layer are formed in the waveguiding layer, and a branch coupler is also provided therein, furthermore, a refractive index of the waveguiding layer is made larger than 3.36 by changing a semiconductor composition.
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