公开(公告)号：US20230296929A1

公开(公告)日：2023-09-21

申请号：US18164712

申请日：2023-02-06

Applicant: TDK Corporation

Inventor： Hiroki HARA ,  Takashi KIKUKAWA ,  Hiroshi TAKE ,  Kenji NAGASE ,  Shuntaro KODAMA

IPC: G02F1/03 ,  G02F1/035 ,  G02F1/21 ,  G02F1/225

CPC classification number: G02F1/0305 ,  G02F1/035 ,  G02F1/212 ,  G02F1/2255 ,  G02F2202/20

Abstract: An optical modulation element is provided with a substrate, a waveguide layer formed on the substrate, a dielectric layer formed on the waveguide layer, and an electrode formed on the dielectric layer. An outer peripheral end portion of the dielectric layer has an offset area positioned inside an outer peripheral end portion of the substrate. In at least a part of the offset area, a distance from the outer peripheral end portion of the substrate to the outer peripheral end portion of the dielectric layer is equal to or less than a distance from the outer peripheral end portion of the substrate to the outer peripheral end portion of the electrode.

公开(公告)号：US20230057036A1

公开(公告)日：2023-02-23

申请号：US17797207

申请日：2021-01-20

Applicant: TDK Corporation

Inventor： Anthony Reymund Melad Binarao ,  Cheng Bu HENG ,  Hiroshi TAKE ,  Kenji NAGASE ,  Shinji IWATSUKA ,  Hiroki HARA

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

Abstract: To provide an optical modulation element whereby reduced drive voltage and suppression of DC drift can be obtained at the same time. An optical modulation element includes: a substrate; and an optical waveguide formed of an electrooptic material film formed on the substrate and having a ridge part which is a protruding portion, and a slab part having a smaller film thickness than the ridge part 11r. The optical waveguide includes a first waveguide part having a first ridge width and a first slab film thickness and to which an RF signal is applied, and a second waveguide part having a second ridge width and a second slab film thickness different from the first slab film thickness and to which a DC bias is applied.

公开(公告)号：US20220060260A1

公开(公告)日：2022-02-24

申请号：US17409171

申请日：2021-08-23

Applicant: TDK CORPORATION

Inventor： Hideaki FUKUZAWA ,  Takashi KIKUKAWA ,  Masahiro SHINKAI ,  Hiroki HARA

IPC: H04B10/50 ,  H04B10/116 ,  H04B10/516

Abstract: A transmission device of the present disclosure is a transmission device that transmits a visible light signal to a receiving device, and includes a laser light source configured to emit visible light, and an optical modulator configured to change intensity of the visible light and generate a visible light signal, in which the optical modulator has an optical waveguide that serves as a transmission path for the visible light, and the optical waveguide is formed of a material containing lithium niobate.

公开(公告)号：US20200272021A1

公开(公告)日：2020-08-27

申请号：US16799770

申请日：2020-02-24

Applicant: TDK Corporation

Inventor： Hiroki HARA ,  Shinji IWATSUKA ,  Takashi KIKUKAWA ,  Toshinori MATSUURA ,  Yasuhiro OHMORI ,  Masaharu DOI ,  Shintaro TAKEUCHI ,  Yoshinobu KUBOTA

IPC: G02F1/225 ,  G02F1/035

Abstract: An electro-optic device is provided with a Mach-Zehnder optical waveguide including at least one linear section and at least one curved section and a differential RF signal electrode provided along the Mach-Zehnder optical waveguide. Optical input/output ports of the Mach-Zehnder optical waveguide are provided at one end side in a first direction in which the linear section extends. The differential RF signal electrode is provided in both the linear and curved sections.