公开(公告)号：US10303036B2

公开(公告)日：2019-05-28

申请号：US15647719

申请日：2017-07-12

Applicant: Fujitsu Optical Components Limited

Inventor： Shintaro Takeuchi ,  Yoshihiko Yoshida ,  Yoshinobu Kubota ,  Masaharu Doi ,  Yasuhiro Ohmori

IPC: G02F1/225 ,  G02B6/00 ,  G02F1/21

Abstract: An optical modulator includes a substrate and an optical waveguide group. The optical waveguide group includes a pair of relay optical waveguides, a pair of first Mach-Zehnder type optical waveguides, and a pair of second Mach-Zehnder type optical waveguides. The pair of the first Mach-Zehnder type optical waveguides are connected to the pair of the relay optical waveguides and includes input ends arranged at positions that deviate from each other in a longitudinal direction of the substrate. The pair of the second Mach-Zehnder type optical waveguides are provided on a pair of branched waveguides of each of the first Mach-Zehnder type optical waveguides and includes input ends arranged at symmetric positions with respect to a straight line that passes through an input end serving as a branch point of the branched waveguides and that extends in the longitudinal direction of the substrate.

公开(公告)号：US20180081251A1

公开(公告)日：2018-03-22

申请号：US15647719

申请日：2017-07-12

Applicant: Fujitsu Optical Components Limited

Inventor： Shintaro TAKEUCHI ,  YOSHIHIKO YOSHIDA ,  Yoshinobu Kubota ,  Masaharu Doi ,  Yasuhiro Ohmori

IPC: G02F1/225

CPC classification number: G02F1/225 ,  G02F2001/212 ,  G02F2201/06

Abstract: An optical modulator includes a substrate and an optical waveguide group. The optical waveguide group includes a pair of relay optical waveguides, a pair of first Mach-Zehnder type optical waveguides, and a pair of second Mach-Zehnder type optical waveguides. The pair of the first Mach-Zehnder type optical waveguides are connected to the pair of the relay optical waveguides and includes input ends arranged at positions that deviate from each other in a longitudinal direction of the substrate. The pair of the second Mach-Zehnder type optical waveguides are provided on a pair of branched waveguides of each of the first Mach-Zehnder type optical waveguides and includes input ends arranged at symmetric positions with respect to a straight line that passes through an input end serving as a branch point of the branched waveguides and that extends in the longitudinal direction of the substrate.

公开(公告)号：US11086149B2

公开(公告)日：2021-08-10

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: G02F1/035 ,  G02F1/01 ,  G02F1/225 ,  G02B6/12 ,  G02F1/21

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：US10989980B2

公开(公告)日：2021-04-27

申请号：US16799753

申请日：2020-02-24

Applicant: TDK Corporation ,  FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Shinji Iwatsuka ,  Kenji Endou ,  Hiroki Hara ,  Toshinori Matsuura ,  Takashi Kikukawa ,  Yasuhiro Ohmori ,  Masaharu Doi ,  Shintaro Takeuchi ,  Takehito Tanaka ,  Yoshinobu Kubota

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

Abstract: An optical modulator is provided with a substrate, first and second optical waveguides each formed of a ridge-shaped electro-optic material film and disposed so as to be mutually adjacent on the substrate, a buffer layer covering upper surfaces of the first and second optical waveguides, first and second signal electrodes provided above the buffer layer so as to be opposed respectively to the first and second optical waveguides, and a dielectric layer covering at least one of a part of an exposed surface of the first signal electrode and a part of an exposed surface of the second signal electrode, and a part of an upper surface of the buffer layer. Differential signals are applied to the first and second signal electrodes.

公开(公告)号：US10095080B2

公开(公告)日：2018-10-09

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: G02B6/26 ,  G02F1/225 ,  H04B10/50 ,  G02F1/00 ,  G02F1/01

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.

公开(公告)号：US11693290B2

公开(公告)日：2023-07-04

申请号：US17165562

申请日：2021-02-02

Applicant: Fujitsu Optical Components Limited

Inventor： Shuntaro Makino ,  Yoshinobu Kubota ,  Yasuhiro Ohmori ,  Masaharu Doi ,  Teruo Kurahashi ,  Shintaro Takeuchi

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

CPC classification number: G02F1/225 ,  G02F1/035 ,  G02F1/0316 ,  G02F2201/07 ,  G02F2201/12 ,  G02F2202/20

Abstract: An optical waveguide device includes a substrate on which an intermediate layer, a thin-film LN layer of lithium niobate, and a buffer layer are stacked; an optical waveguide formed in the thin-film LN layer; and a plurality of electrodes near the optical waveguide. The intermediate layer and the buffer layer contain a same material of a metal element of any one of group 3 of group 18 of a periodic table of elements.

公开(公告)号：US12044910B2

公开(公告)日：2024-07-23

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 ,  H04J14/02

CPC classification number: G02F1/0353 ,  G02F1/212 ,  G02F1/225 ,  G02F2202/20 ,  H04J14/02

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：US11693291B2

公开(公告)日：2023-07-04

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 ,  G02F1/03 ,  F21V8/00

CPC classification number: G02F1/225 ,  G02B6/0065 ,  G02F1/0316 ,  G02F2201/07

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：US11624965B2

公开(公告)日：2023-04-11

申请号：US17350627

申请日：2021-06-17

Applicant: Fujitsu Optical Components Limited

Inventor： Shuntaro Makino ,  Yoshinobu Kubota ,  Yasuhiro Ohmori ,  Masaharu Doi ,  Teruo Kurahashi

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

Abstract: An optical waveguide device includes an intermediate layer, a thin-film LN layer including X-cut lithium niobate, and a buffer layer stacked on a substrate; an optical waveguide formed in the thin-film LN layer; and an electrode for driving. The intermediate layer is formed by an upper first intermediate layer and a lower second intermediate layer, the second intermediate layer having a permittivity that is smaller than a permittivity of the first intermediate layer.

公开(公告)号：US20210325760A1

公开(公告)日：2021-10-21

申请号：US17165562

申请日：2021-02-02

Applicant: Fujitsu Optical Components Limited

Inventor： Shuntaro Makino ,  Yoshinobu Kubota ,  Yasuhiro Ohmori ,  Masaharu Doi ,  Teruo Kurahashi ,  Shintaro Takeuchi

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

Abstract: An optical waveguide device includes a substrate on which an intermediate layer, a thin-film LN layer of lithium niobate, and a buffer layer are stacked; an optical waveguide formed in the thin-film LN layer; and a plurality of electrodes near the optical waveguide. The intermediate layer and the buffer layer contain a same material of a metal element of any one of group 3 of group 18 of a periodic table of elements.