公开(公告)号：US12300973B2

公开(公告)日：2025-05-13

申请号：US17323616

申请日：2021-05-18

Applicant: Fujitsu Optical Components Limited

Inventor： Kazumasa Takabayashi ,  Shuntaro Makino

IPC: H01S5/40 ,  H01S5/50

Abstract: An integrated photonic device having an array of two or more semiconductor optical amplifiers includes a first semiconductor optical amplifier, which has a first gain region and a second gain region connected by a first connecting waveguide, and a second semiconductor optical amplifier, which is provided in parallel with the first semiconductor optical amplifier and has a third gain region and a fourth gain region connected by a second connecting waveguide. The first gain region and the second gain region are provided on an outer side of the third gain region and the fourth gain region. The first connecting waveguide is configured to connect the first gain region and the second gain region on the outer side of the second connecting waveguide.

公开(公告)号：US12242143B2

公开(公告)日：2025-03-04

申请号：US17699746

申请日：2022-03-21

Applicant: Fujitsu Optical Components Limited

Inventor： Yoshihiko Yoshida ,  Nobuaki Mitamura ,  Shuntaro Makino ,  Yoshinobu Kubota

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

Abstract: An optical device includes a silicon substrate, a waveguide formed of a thin film that is laminated on the silicon substrate and that is made of a perovskite oxide with a large electro-optic effect as compared to lithium niobate, and a cladding layer that covers the waveguide. Further, the optical device includes ground electrode that has a ground potential and a signal electrode that is arranged at a position facing the ground electrode and that applies driving voltage to the waveguide.

公开(公告)号：US12153294B2

公开(公告)日：2024-11-26

申请号：US17947657

申请日：2022-09-19

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Shuntaro Makino ,  Teruo Kurahashi ,  Yoshinobu Kubota ,  Yoshihiko Yoshida ,  Nobuaki Mitamura ,  Takehito Tanaka

IPC: G02F1/035

Abstract: An optical device includes a substrate, a first cladding layer that is laminated on one surface of the substrate, and a first optical waveguide that is formed in the first cladding layer at a side opposite to the substrate in the first cladding layer. The optical device further includes an electro-optic crystal layer that is laminated on a surface of the first cladding layer at a side opposite to the substrate, and a second optical waveguide that is formed of the electro-optic crystal layer on a surface of the electro-optic crystal layer at a side opposite to the first cladding layer. The optical device further includes a second cladding layer that is laminated on a surface of the electro-optic crystal layer at a side opposite to the first cladding layer.

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：US12032268B2

公开(公告)日：2024-07-09

申请号：US17168842

申请日：2021-02-05

Applicant: Fujitsu Optical Components Limited

Inventor： Shinji Maruyama ,  Shuntaro Makino ,  Yoshimitsu Sakai ,  Yoshinobu Kubota

IPC: G02F1/31

CPC classification number: G02F1/31 ,  G02F2201/02 ,  G02F2202/20 ,  G02F2203/07

Abstract: An optical modulator in which an optical signal is input from one side of a package, includes in the package, a chip that optically modulates the optical signal and in which an input waveguide and an output waveguide of the optical signal are led to mutually different destinations each being one end of the chip facing the one side of the package and a side surface of the chip orthogonal to the one end of the chip; an input optical system coupled to the input waveguide of the chip; and an output optical system coupled to the output waveguide of the chip.

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：US20220390775A1

公开(公告)日：2022-12-08

申请号：US17726249

申请日：2022-04-21

Applicant: Fujitsu Optical Components Limited

Inventor： Shuntaro Makino ,  Masaharu Doi ,  YOSHIHIKO YOSHIDA

IPC: G02F1/035 ,  G02F1/03

Abstract: An optical device includes an X-cut substrate, and a first waveguide and a second waveguide each being formed on the substrate and having a folding structure. The optical device includes a first signal electrode to generate a first electric field, and a second signal electrode to generate a second electric field with a reverse phase as compared to the first field. The first waveguide includes a first waveguide on an outward side to which the first field is applied from the first signal electrode, and a first waveguide on a return side to which the second field is applied from the second signal electrode. The second waveguide includes a second waveguide on the outward side to which the first field is applied from the first signal electrode, and a second waveguide on the return side to which the second field is applied from the second signal electrode.

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.