OPTICAL CIRCUIT ELEMENT, OPTICAL TRANSCEIVER USING OPTICAL CIRCUIT ELEMENT, AND MANUFACTURING METHOD FOR OPTICAL CIRCUIT ELEMENT

摘要

To provide an optical circuit element, an optical transceiver using the optical circuit element, and a manufacturing method for the optical circuit element that can improve tolerance for a manufacturing error, and suppress variations for each product in the optical circuit element.SOLUTION: An optical circuit element 10A formed on a substrate includes a rib-shaped first waveguide 110, and a rib-shaped second waveguide 120A having a shape in a width direction asymmetrical to the first waveguide. The first waveguide has a first segment 111 whose width changes along a light propagation direction and a second segment 112 continuous with the first segment. The second waveguide includes a coupling waveguide 121A adjacent to the second segment of the first waveguide. The width of at least one of the second segment of the first waveguide and the coupling waveguide of the second waveguide changes along the light propagation direction.SELECTED DRAWING: Figure 4