公开(公告)号：US10481464B2

公开(公告)日：2019-11-19

申请号：US15516028

申请日：2016-04-28

Applicant: SUMITOMO OSAKA CEMENT CO., LTD.

Inventor： Toshio Kataoka ,  Kei Kato

IPC: G02F1/225 ,  G02B6/125 ,  G02B6/24 ,  G02B6/12 ,  G02F1/21

Abstract: The objective of the present invention is to provide an optical modulator adapted for use with various modulating units and various modulation regions, and with which variability in optical losses is limited as far as possible. An optical modulator in which an optical waveguide and a control electrode for controlling an optical wave propagating through the optical waveguide are provided in a substrate, characterized in that: the optical waveguide is provided with a first branching portion which causes one input light beam to branch into two light beams; each of a first and a second modulating portion connected to two branched waveguides which branch at the first branching portion is provided with a structure in which one or more Mach-Zehnder type optical waveguides are combined; the control electrode comprises signal electrodes which apply modulated signals to the first and second modulating portions; input portions of all the signal electrodes are disposed on either the left or the right of the substrate relative to the direction in which the optical wave propagates; and in relation to output portions of the signal electrodes, the output portions of the signal electrodes led out from each modulating portion are disposed on the side on which the first or second modulating portions are disposed, relative to the direction in which the optical wave propagates.

公开(公告)号：US10401658B2

公开(公告)日：2019-09-03

申请号：US15504254

申请日：2015-08-31

Applicant: SUMITOMO OSAKA CEMENT CO., LTD.

Inventor： Toshio Kataoka ,  Kei Kato ,  Junichiro Ichikawa

IPC: G02F1/01 ,  G02F1/03 ,  G02F1/00 ,  G02F1/025 ,  G02F1/035 ,  G02F1/225

Abstract: Provided is an optical modulator including: a relay substrate; a first transmission line that is provided on a flat surface of the relay substrate, and transmits an electrical signal along the flat surface; a second transmission line that is provided separately from the relay substrate, is electrically connected to the first transmission line, and transmits, to the first transmission line, the electrical signal that has been input from an outer side in a direction that is not included in the flat surface; a modulation unit that modulates an optical signal by using the electrical signal that is transmitted by the first transmission line and the second transmission line; and a shield that shields a radiation component of the electrical signal that is radiated from the second transmission line.

公开(公告)号：US11586061B2

公开(公告)日：2023-02-21

申请号：US17212971

申请日：2021-03-25

Applicant: SUMITOMO OSAKA CEMENT CO., LTD.

Inventor： Hideki Ichimei ,  Kei Kato ,  Norikazu Miyazaki

IPC: G02F1/035 ,  G02F1/03

Abstract: An optical waveguide device includes a substrate on which an optical waveguide is formed, and a reinforcing block disposed on the substrate, along an end surface of the substrate on which an input portion or an output portion of the optical waveguide is disposed, in which an optical component that is joined to both the end surface of the substrate and an end surface of the reinforcing block is provided, a material used for a joining surface of the optical component and a material used for the substrate or the reinforcing block have at least different linear expansion coefficients of a direction parallel to the joining surface, and an area of the joining surface is set to be smaller than a maximum value of a total of areas of cross sections of the substrate and the reinforcing block parallel to the joining surface.

公开(公告)号：US10247966B2

公开(公告)日：2019-04-02

申请号：US15719583

申请日：2017-09-29

Applicant: SUMITOMO OSAKA CEMENT CO., LTD.

Inventor： Kei Kato ,  Norikazu Miyazaki ,  Ryo Shimizu

IPC: G02F1/01

Abstract: Provided is an optical modulator module in which a modulation substrate having a plurality of optical modulation units is stored inside a package case. The optical modulator module includes a plurality of signal supply lines configured to supply a modulation signal to the optical modulation unit through a connector terminal which is introduced into the package case. At least two or more of the plurality of signal supply lines are set such that the signal supply lines have overall electrical lengths which are different from each other. A particular part of the signal supply line employs at least one of the following configurations (a) and (b): (a) setting the signal supply line having a longer overall electrical length to have a wider cross-sectional area of a surface perpendicular to a direction in which the modulation signal propagates; and (b) setting a cross-sectional area of the particular part to be wider than cross-sectional areas of parts other than the particular part and setting the signal supply line having a longer overall electrical length to have the particular part increased in length.

公开(公告)号：US20180284371A1

公开(公告)日：2018-10-04

申请号：US15893789

申请日：2018-02-12

Applicant: Sumitomo Osaka Cement Co., Ltd

Inventor： Toshio Kataoka ,  Norikazu Miyazaki ,  Kei Kato

IPC: G02B6/42 ,  G02B6/30

Abstract: An optical element module includes a housing which houses an optical element, in which the optical element is optically coupled to an optical fiber introduced into the housing, the optical fiber is held by a fiber fixing part provided at the housing, the fiber fixing part includes, along a longitudinal direction thereof, a first tubular portion, a second tubular portion which is connected to a through-hole provided in the side wall of the housing and has an inner diameter substantially equal to an inner diameter of the through-hole and smaller than an inner diameter of the first tubular portion, and a tapered portion which continuously connects the first tubular portion and the second tubular portion, and the other end of a slit of the fiber fixing part reaches the tapered portion or the second tubular portion.