公开(公告)号：US20230161184A1

公开(公告)日：2023-05-25

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

CPC classification number: 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：US20230231632A1

公开(公告)日：2023-07-20

申请号：US18077829

申请日：2022-12-08

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Koji OTSUBO ,  Kazumasa TAKABAYASHI ,  Masaki SUGIYAMA ,  Shuntaro MAKINO

IPC: H04B10/69 ,  H04B10/50 ,  H04B10/516

CPC classification number: H04B10/69 ,  H04B10/503 ,  H04B10/5161 ,  H01S5/50

Abstract: An optical device includes an optical coupler that inputs an optical signal received from a light source, a semiconductor optical amplifier that amplifies the optical signal received from the optical coupler, and a light receiving element that receives spontaneous emission light received from the semiconductor optical amplifier. The optical coupler includes a first input port to which the optical signal received from the light source is input, a second input port that is connected to an input stage of the light receiving element and that is different from the first input, and an output port that is connected to an input stage of the semiconductor optical amplifier, and that outputs optical signal received from the first input port to the semiconductor optical amplifier. The light receiving element receives, via the output port and the second input port, spontaneous emission light received from the semiconductor optical amplifier.

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：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：US20190372699A1

公开(公告)日：2019-12-05

申请号：US16369259

申请日：2019-03-29

Applicant: Fujitsu Optical Components Limited

Inventor： Shuntaro MAKINO ,  Kazumasa Takabayashi

IPC: H04J14/06 ,  H04B10/40 ,  G02B27/28 ,  G02F1/225

Abstract: An optical device includes an optical coupler that performs branching of the input light and outputs a first-type branched light and a second-type branched light; a polarization converter that changes the direction of polarization of the second-type branched light output from the optical coupler; and a polarization synthesizer that outputs a polarization multiplexed light by synthesizing the first-type branched light, which is output from the optical coupler, and the second-type branched light, which has the direction of polarization changed by the polarization converter. The optical coupler has the wavelength characteristic that cancels out the wavelength characteristic of the polarization synthesizer regarding the second-type branched light included in the polarization multiplexed light.