公开(公告)号：US20160223881A1

公开(公告)日：2016-08-04

申请号：US14946078

申请日：2015-11-19

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Masaharu DOI ,  YOSHIHIKO YOSHIDA ,  Yoshinobu KUBOTA ,  Yoshitada KAWASHIMA

IPC: G02F1/225 ,  G02F1/00

CPC classification number: G02F1/0036 ,  G02F1/0316 ,  G02F1/0508 ,  G02F1/225 ,  G02F1/2255 ,  G02F2001/212 ,  G02F2202/20 ,  G02F2202/22

Abstract: An optical modulator includes: a ferroelectric substrate in which an input optical waveguide, first and second optical waveguides, and an output optical waveguide are formed; a first electrode formed in a vicinity of the first optical waveguide and to which a first DC voltage is applied; a second electrode formed in a vicinity of the second optical waveguide and to which a second DC voltage is applied; a third electrode electrically connected to the first electrode and formed on both sides of the second electrode; and a fourth electrode electrically connected to the second electrode and formed on both sides of the first electrode. A first gap between the first electrode and the fourth electrode is approximately the same as a second gap between the second electrode and the third electrode. A gap between the third electrode and the fourth electrode is 1-5 times greater than the first gap.

Abstract translation: 光调制器包括：形成输入光波导，第一和第二光波导和输出光波导的铁电基板; 形成在第一光波导附近并施加第一直流电压的第一电极; 形成在所述第二光波导附近并且施加有第二DC电压的第二电极; 电连接到第一电极并形成在第二电极的两侧上的第三电极; 以及电连接到第二电极并形成在第一电极的两侧上的第四电极。 第一电极和第四电极之间的第一间隙与第二电极和第三电极之间的第二间隙大致相同。 第三电极和第四电极之间的间隙比第一间隙大1-5倍。

公开(公告)号：US20220373828A1

公开(公告)日：2022-11-24

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: G02F1/035 ,  G02F1/03

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：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：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：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.