公开(公告)号：US20230305228A1

公开(公告)日：2023-09-28

申请号：US18153680

申请日：2023-01-12

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Jianping WANG ,  Akira OKA ,  Hoshihiko TODA

IPC: G02B6/122

CPC classification number: G02B6/122 ,  G02B6/2938

Abstract: An optical device includes an input waveguide and an output waveguide. The optical device includes an interference region that includes an input unit optically coupled with the input waveguide, that includes an output unit optically coupled with the output waveguide, and that has a larger waveguide width than a waveguide width of the input waveguide and a waveguide width of the output waveguide. Further, the optical device includes an unnecessary light waveguide that is included in the output unit in the interference region and that is arranged parallel to the output waveguide. The unnecessary light waveguide is a single-mode waveguide that includes a rib portion and a slab portion with a smaller thickness than a thickness of the rib portion, and that guides only a fundamental mode of light.