公开(公告)号：US20240219642A1

公开(公告)日：2024-07-04

申请号：US18539873

申请日：2023-12-14

Applicant: TDK CORPORATION

Inventor： Yasuhiro TAKAGI ,  Hiroki Hara ,  Atsushi Shimura ,  Hajime Utsunomiya ,  Jiro Yoshinari

IPC: G02B6/293

CPC classification number: G02B6/29344

Abstract: An optical coupler includes: light input ports on a first side surface; monitoring light output ports on a second side surface; one light output port on a third side surface; and multimode-interference-type optical coupling parts, a first multimode-interference coupling part is connected to a first light-input-side waveguide on the input side, and to a first monitoring-light-output-side waveguide and a first connecting waveguide on the output side, the second multimode-interference coupling part is connected to a second light-input-side waveguide and the first connecting waveguide on the input side, and to a second monitoring-light-output-side waveguide and a second connecting waveguide on the output side, and the third multimode-interference coupling part is connected to a third light-input-side waveguide and the second connecting waveguide on the input side, and connected to a third monitoring-light-output-side waveguide and a light-output-port-connected waveguide on the output side, and the monitoring-light-output-side waveguides are free of an intersection.

公开(公告)号：US12248205B2

公开(公告)日：2025-03-11

申请号：US17924517

申请日：2021-07-13

Applicant: TDK CORPORATION

Inventor： Hajime Utsunomiya ,  Takashi Kikukawa

IPC: G02F1/035 ,  G02F1/21 ,  G02F1/225

Abstract: This optical modulation element includes a first optical waveguide, a second optical waveguide, a first electrode for applying an electric field to the first optical waveguide, and a second electrode for applying an electric field to the second optical waveguide. The first optical waveguide and the second optical waveguide each include a ridge-shaped portion protruding from a first surface of a lithium niobate film. A first interaction length L1 that is a length of a part of the first electrode overlapping the first optical waveguide in a longitudinal direction is 0.9 mm or more and 20 mm or less. A second interaction length L2 that is a length of a part of the second electrode overlapping the second optical waveguide in the longitudinal direction is 0.9 mm or more and 20 mm or less.