Optical circuit element, optical communication apparatus, and method for manufacturing optical circuit element

An optical communication apparatus comprising:

• a first waveguide;
• and
• a second waveguide having a shape in a width direction, the shape being asymmetrical to the first waveguide, wherein
• the first waveguide includes a first segment and a second segment, the first segment having a width that changes along a light propagation direction, the second segment continuous with the first segment,
• the second waveguide includes a coupled waveguide adjacent to the second segment of the first waveguide, and
• at least one of the second segment and the coupled waveguide has a shape with a width that changes along the light propagation direction.

A method for manufacturing optical circuit element, the method comprising:

• forming a first waveguide on a substrate;
• and
• forming a second waveguide having a shape in a width direction, the shape being asymmetrical to the first waveguide, wherein
• the first waveguide includes a first segment and a second segment, the first segment having a width that changes along a light propagation direction, the second segment continuous with the first segment,
• the second waveguide includes a coupled waveguide adjacent to the second segment of the first waveguide, and
• at least one of the second segment and the coupled waveguide has a shape with a width that changes along the light propagation direction.