Kyocera Corporation

Dan Maeda

Tomoya Sugita

Reona Motoji

An isolatorincludes a substrate, waveguide portions, an insulating layer, and a non-reciprocal member. The waveguide portionsextend along a main surface of the substrate, and are positioned side by side on the main surface. The insulating layercovers at least part of outer edges of the waveguide portions, and includes a recessoverlapping with a first waveguide portionwhen viewed in a normal direction of the main surface. The non-reciprocal memberoverlaps with at least part of the first waveguide portioninside the recesswhen viewed in the normal direction. In a cross-section perpendicular to an extension direction of the first waveguide portion, expressions (1) and (2) are satisfied: w1≤w3≤mfd1+mfd2−w2−2×x . . . (1), x≥(mfd2−w2)/2 . . . (2).

Isolator

An optical integrated circuit includes a substrate including a substrate surface, a first waveguide and a second waveguide configured to allow electromagnetic waves to propagate along the substrate surface, and a non-reciprocal member disposed on a side of the first waveguide and the second waveguide remote from the substrate surface. At least part of the non-reciprocal member is disposed in a range of a mode field diameter of TM mode electromagnetic waves in the first waveguide. The non-reciprocal member is not disposed in a range of a mode field diameter of TM mode electromagnetic waves in the second waveguide.

Optical integrated circuit

An optical integrated circuit includes: a waveguide including a first part and a second part and configured to couple an electromagnetic wave propagating in the first part and an electromagnetic wave propagating in the second part; and a non-reciprocal member positioned alongside the second part in an amplitude direction of an electric field component of the electromagnetic wave. In a range where the first part and the second part are coupled with each other, deviation between a center of an energy distribution of an electric field component of the electromagnetic wave propagating in the first part and a center of an energy distribution of an electric field component of the electromagnetic wave propagating in the second part falls within a prescribed range.

An isolator includes a substrate, a waveguide, an insulating layer, and a non-reciprocity member. The insulating layer includes a recess. The recess overlaps at least part of the waveguide. The non-reciprocity member is positioned in the recess. The waveguide includes a first waveguide and a second waveguide. The recess includes a first recess and a second recess. The non-reciprocity member includes a first non-reciprocity member positioned in the first recess and a second non-reciprocity member positioned in the second recess. A propagation direction of the electromagnetic wave in a portion of the first waveguide, the portion overlapping the first non-reciprocity member, and a propagation direction of the electromagnetic wave in a portion of the second waveguide, the portion overlapping the second non-reciprocity member, are different from each other.

Growing community of inventors

Yokohama, Japan

Dan Maeda