公开(公告)号：US20180129083A1

公开(公告)日：2018-05-10

申请号：US15729220

申请日：2017-10-10

Applicant: Fujitsu Optical Components Limited

Inventor： Toyokazu SASAKI ,  Yoshihiko YOSHIDA ,  Yasuhiro OHMORI ,  Yoshinobu KUBOTA

IPC: G02F1/03 ,  G02F1/035 ,  G02F1/225 ,  H04B10/50

CPC classification number: G02F1/0305 ,  G02F1/035 ,  G02F1/225 ,  G02F2001/212 ,  G02F2202/20 ,  H04B10/5051

Abstract: An optical modulator includes a substrate having an electro-optic effect; a waveguide pattern provided on the substrate and configured to modulate light; and a dummy pattern having a predetermined potential along the waveguide pattern from an input side to an output side.

公开(公告)号：US20230004028A1

公开(公告)日：2023-01-05

申请号：US17725944

申请日：2022-04-21

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Shuntaro MAKINO ,  Yoshinobu KUBOTA ,  Yasuhiro OHMORI ,  Masaharu DOI ,  Masaki SUGIYAMA ,  Shintaro TAKEUCHI ,  Yoshihiko YOSHIDA ,  Shinji MARUYAMA ,  Teruo KURAHASHI

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

Abstract: An optical device includes a thin film Lithium Niobate (LN) layer, a first optical waveguide, and a second optical waveguide. The thin film LN layer is an X-cut or a Y-cut LN layer. The first optical waveguide is an optical waveguide that is formed on the thin film LN layer along a direction that is substantially perpendicular to a Z direction of a crystal axis of the thin film LN layer. The second optical waveguide is an optical waveguide that is routed and connected to the first optical waveguide. At least a part of a core of the first optical waveguide is made thicker than a core of the second optical waveguide.

公开(公告)号：US20210103165A1

公开(公告)日：2021-04-08

申请号：US16832647

申请日：2020-03-27

Applicant: TDK Corporation ,  FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Shinji IWATSUKA ,  Kenji SASAKI ,  Hiroki HARA ,  Yasuhiro OHMORI ,  Masaharu DOI ,  Shintaro TAKEUCHI ,  Yoshihiko YOSHIDA ,  Yoshinobu KUBOTA

IPC: G02F1/035 ,  G02F1/225

Abstract: An electro-optic device is provided with a substrate, an optical waveguide formed of a lithium niobate film with a ridge shape on the substrate, and an electrode that applies an electric field to the optical waveguide. The optical waveguide includes a modulation waveguide provided in an electric field application region applied with the electric field and having a thickness of 1 μm or larger and a bent waveguide provided in a region other than the electric field application region and having a curvature radius of 16 μm or larger and 80 μm or smaller.

公开(公告)号：US20210325761A1

公开(公告)日：2021-10-21

申请号：US17169983

申请日：2021-02-08

Applicant: Fujitsu Optical Components Limited

Inventor： Shuntaro MAKINO ,  Yoshinobu KUBOTA ,  Yasuhiro OHMORI ,  Masaharu DOI ,  Shintaro TAKEUCHI

IPC: G02F1/225 ,  F21V8/00 ,  G02F1/03

Abstract: An optical waveguide device has a substrate, an intermediate layer, a thin-film LN layer containing an X-cut lithium niobate, and a buffer layer stacked on the substrate, and an optical waveguide having a ridge shape formed in the thin-film LN layer. The optical waveguide device includes a plurality of electrodes provided, respectively, at a first side and a second side of the optical waveguide. The electrodes are disposed so that respective bottom surfaces thereof are at positions lower than a position of a surface of the buffer layer.

公开(公告)号：US20200041824A1

公开(公告)日：2020-02-06

申请号：US16515573

申请日：2019-07-18

Applicant: Fujitsu Optical Components Limited

Inventor： Yasuhiro OHMORI ,  Yoshinobu KUBOTA ,  Masaharu DOI ,  Shintaro TAKEUCHI ,  Yoshihiko YOSHIDA

IPC: G02F1/035 ,  G02F1/225

Abstract: An optical modulator includes an optical waveguide of a ridge type formed of a thin film of a dielectric material having an electro-optic effect over a substrate, a buffer layer covering the optical waveguide, and a signal electrode provided over the optical waveguide via the buffer layer, wherein a width of the signal electrode is greater than a ridge width of the optical waveguide and wherein the signal electrode covers at least one of sidewalls of a ridge of the optical waveguide.

公开(公告)号：US20200310216A1

公开(公告)日：2020-10-01

申请号：US16832784

申请日：2020-03-27

Applicant: TDK Corporation ,  FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Shinji IWATSUKA ,  Kenji SASAKI ,  Hiroki HARA ,  Yasuhiro OHMORI ,  Masaharu DOI ,  Shintaro TAKEUCHI ,  Yoshihiko YOSHIDA ,  Yoshinobu KUBOTA

IPC: G02F1/225 ,  G02F1/035

Abstract: An electro-optic device is provided with a substrate, an optical waveguide formed of a lithium niobate film with a ridge shape on the substrate, and an electrode that applies an electric field to the optical waveguide. The optical waveguide includes a first waveguide section provided at least in an electric field application region applied with the electric field and having a thickness of 1 μm or larger and a second waveguide section provided in a region other than the electric field application region and having a thickness of 0.3 μm or larger and less than 1 μm.

公开(公告)号：US20200272020A1

公开(公告)日：2020-08-27

申请号：US16799763

申请日：2020-02-24

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED ,  TDK Corporation

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

IPC: G02F1/225 ,  G02F1/03

Abstract: An optical modulator is provided with a ridge-shaped optical waveguide formed of a dielectric thin film having electro-optic effect, a buffer layer covering the optical waveguide, a signal electrode formed on the buffer layer so as to be opposed to the optical waveguide through the buffer layer; a ground electrode formed on the buffer layer together with the signal electrode, and a dielectric film having a higher dielectric constant than air and covering at least a part of exposed surfaces of the signal electrode and ground electrode and exposed surfaces of the buffer layer.

公开(公告)号：US20180031945A1

公开(公告)日：2018-02-01

申请号：US15650222

申请日：2017-07-14

Applicant: Fujitsu Optical Components Limited

Inventor： Yasuhiro OHMORI ,  Yoshinobu KUBOTA ,  Masaharu DOI ,  Masaki SUGIYAMA

IPC: G02F1/225 ,  G02F1/00 ,  G02F1/01 ,  H04B10/50

CPC classification number: G02F1/2255 ,  G02F1/0027 ,  G02F1/0123 ,  G02F1/2257 ,  G02F2201/07 ,  G02F2203/21 ,  H04B10/50572

Abstract: An optical modulator includes an optical modulator chip configured to optically modulate an optical signal using an electrical signal input thereto; and a relay substrate configured to relay and couple the electrical signal to the optical modulator chip. The optical modulator chip includes a signal electrode and a ground electrode for the electrical signal, formed along a waveguide for the optical signal. One end of the optical modulator chip is arranged to face the relay substrate. An electrode connection portion coupling the electrical signal to the relay substrate by wire is provided at the one end. A distance between a tip of one end of the signal electrode in the electrode connection portion and the end of the optical modulator chip is less than a distance between a tip of an end of the ground electrode in the electrode connection portion and the end of the optical modulator chip.