Integrated Optical Device and Alignment Method for Integrated Optical Device
AssigneeNTT, Inc.
InventorsYu Kurata, Yoshihiro Ogiso, Yasuaki Hashizume
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Abstract
An integrated optical device includes an optical functional element in which an optical waveguide including a core and a cladding is provided on a substrate, the optical functional element including: an input waveguide or an output waveguide of an optical signal provided on an end face of the substrate; and a reflectance control body that is provided in the vicinity of the core and forms a region having a reflectance different from reflectances of the core, the cladding, and the substrate when light is incident on the end face, and the input waveguide or the output waveguide of the optical functional element is butt-coupled and bonded to another waveguide via the end face.
Claims12
An integrated optical device comprising an optical functional element in which an optical waveguide including a core and a cladding is provided on a substrate, the optical functional element comprising:
- an input waveguide or an output waveguide of an optical signal provided on an end face of the substrate;
- and
- a reflectance control body that is provided in the vicinity of the core and forms a region having a reflectance different from reflectances of the core, the cladding, and the substrate when light is incident on the end face,
- wherein the input waveguide or the output waveguide of the optical functional element is butt-coupled and bonded to another waveguide via the end face.
An alignment method for an integrated optical device including an optical functional element in which an optical waveguide including a core and a cladding is provided on a substrate, and the optical functional element comprising:
- an input waveguide or an output waveguide of an optical signal provided on an end face of the substrate;
- and
- a reflectance control body that is provided in the vicinity of the core and forms a region having a reflectance different from reflectances of the core, the cladding, and the substrate when light is incident on the end face,
- the alignment method comprising:
- in alignment for butt-coupling via the end face between the optical functional element and an optical circuit element comprising an input waveguide or an output waveguide for connection,
- monitoring light intensity of reflected return light branched by a circulator or a coupler disposed at an optical input of the optical circuit element;
- and
- performing alignment by estimating correspondence between a scanning position and a position of the region having different reflectance formed by the reflectance control body on the end face from a position at which a profile of the light intensity of the reflected return light in accordance with a cross-sectional shape of the end face becomes a peak by performing scanning while moving the optical functional element or the optical circuit element.
Dependencies are inferred from the claim text.