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：US10082683B2

公开(公告)日：2018-09-25

申请号：US15617478

申请日：2017-06-08

Applicant: Fujitsu Optical Components Limited

Inventor： Yoshihiko Yoshida ,  Masaharu Doi ,  Yoshinobu Kubota

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

CPC classification number: G02F1/0027 ,  G02F1/225 ,  G02F2001/212 ,  G02F2201/501

Abstract: An optical modulator includes: a ferroelectric substrate in which an input optical waveguide, a pair of branched optical waveguides, and an output optical waveguide are formed; a signal electrode that is formed in a vicinity of at least one of the pair of branched optical waveguides; a first protection member that is attached to an input end of the ferroelectric substrate in which the input optical waveguide is formed; and a second protection member that is attached to an output end of the ferroelectric substrate in which the output optical waveguide is formed. The first protection member and the second protection member have a Mohs hardness that is less than or equal to a Mohs hardness of the ferroelectric substrate, and are formed of a glass material that does not have a pyroelectric effect.

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：US10295883B2

公开(公告)日：2019-05-21

申请号：US15649185

申请日：2017-07-13

Applicant: Fujitsu Optical Components Limited

Inventor： Shinji Maruyama ,  Masaharu Doi

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

Abstract: An optical module includes a driver that is provided on a board and generates an electrical signal according to a data signal, and an optical modulator that is connected to an optical fiber and provided on the board and that modulates light emitted from the optical fiber using the electrical signal generated by the driver. The optical module has a cut-out portion that is formed by cutting out part of its outer shape and that accommodates the driver so that the driver overlaps the optical fiber when viewed from a direction perpendicular to the board.

公开(公告)号：US10054744B2

公开(公告)日：2018-08-21

申请号：US15067949

申请日：2016-03-11

Applicant: Fujitsu Optical Components Limited

Inventor： Masaharu Doi ,  Akira Ishii ,  Teruhiro Kubo ,  Yoshinobu Kubota

IPC: G02B6/32 ,  G02B6/30 ,  G02B6/34 ,  G02F1/225

CPC classification number: G02B6/30 ,  G02B6/32 ,  G02B6/34 ,  G02F1/225 ,  G02F2203/02

Abstract: An optical module includes a substrate on which an optical waveguide is formed, and an optical fiber assembly. The optical fiber assembly includes an optical fiber, a translucent member, and a mirror portion. The translucent member includes a joint surface joined to an end surface of the substrate at an end of the optical waveguide, and is attached to a distal end of the optical fiber. The mirror portion is formed on the translucent member, reflects light emitted from the distal end of the optical fiber in a direction different from a traveling direction of the light, and collects the reflected light into the end of the optical waveguide through the joint surface.

公开(公告)号：US20180031869A1

公开(公告)日：2018-02-01

申请号：US15617478

申请日：2017-06-08

Applicant: Fujitsu Optical Components Limited

Inventor： YOSHIHIKO YOSHIDA ,  Masaharu Doi ,  Yoshinobu Kubota

IPC: G02F1/00 ,  G02F1/225

CPC classification number: G02F1/0027 ,  G02F1/225 ,  G02F2001/212 ,  G02F2201/501

Abstract: An optical modulator includes: a ferroelectric substrate in which an input optical waveguide, a pair of branched optical waveguides, and an output optical waveguide are formed; a signal electrode that is formed in a vicinity of at least one of the pair of branched optical waveguides; a first protection member that is attached to an input end of the ferroelectric substrate in which the input optical waveguide is formed; and a second protection member that is attached to an output end of the ferroelectric substrate in which the output optical waveguide is formed. The first protection member and the second protection member have a Mohs hardness that is less than or equal to a Mohs hardness of the ferroelectric substrate, and are formed of a glass material that does not have a pyroelectric effect.

公开(公告)号：US12197054B2

公开(公告)日：2025-01-14

申请号：US17726249

申请日：2022-04-21

Applicant: Fujitsu Optical Components Limited

Inventor： Shuntaro Makino ,  Masaharu Doi ,  Yoshihiko Yoshida

IPC: G02F1/03 ,  G02F1/035

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：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.