公开(公告)号：US11852948B2

公开(公告)日：2023-12-26

申请号：US17742812

申请日：2022-05-12

Applicant: Fujitsu Optical Components Limited

Inventor： Tetsuji Yamabana

IPC: G02F1/21 ,  G02F1/225 ,  G02B6/293 ,  G02F1/025

CPC classification number: G02F1/212 ,  G02B6/2935 ,  G02F1/025 ,  G02F1/225

Abstract: In an optical transmitter having an electro-optic modulator with first child MZI and a second child MZI nested to form a parent MZI, and a processor that controls the bias voltages of electro-optic modulator. In the first section of a control loop, the processor simultaneously superimposes different dither signals onto the first bias voltage of the first child MZI and the second bias voltage of the second child MZI, and extracts the first phase error information for the first child MZI and the first-round third phase error for the parent MZI from a first monitoring result. In the second section of the control loop, the processor simultaneously superimposes different dither signals onto the first and second bias voltages, and extracts the second phase error information for the second child MZI and the second-round third phase error for the parent MZI from a second monitoring result.

公开(公告)号：US11849538B2

公开(公告)日：2023-12-19

申请号：US17445738

申请日：2021-08-24

Applicant: NGK Electronics Devices, Inc. ,  NGK Insulators, Ltd. ,  Fujitsu Optical Components Limited

Inventor： Noboru Kubo ,  Masato Ishizaki ,  Kento Takahashi

IPC: H05K1/14 ,  H05K1/02 ,  H05K1/11 ,  G02B6/42 ,  H05K1/18

CPC classification number: H05K1/0245 ,  G02B6/4281 ,  H05K1/118 ,  H05K1/148 ,  H05K1/18 ,  H05K2201/09236 ,  H05K2201/09481 ,  H05K2201/09672 ,  H05K2201/2018

Abstract: A terminal substrate includes a signal terminal disposed on a terminal surface of an insulation ceramic layer. An insulation resin layer of a flexible substrate includes a first surface facing the terminal surface, and a second surface on an opposite side of the first surface. A first signal pad disposed on the first surface is joined to the signal terminal. A first penetration conductive part penetrates the insulation resin layer from the first signal pad. A first signal line is disposed on the second surface. A second penetration conductive part penetrates the insulation resin layer from the first signal line. A second signal line is disposed on the first surface. A third penetration conductive part penetrates the insulation resin layer from the second signal line. A second signal pad is disposed on the second surface.

公开(公告)号：US20230305327A1

公开(公告)日：2023-09-28

申请号：US18145141

申请日：2022-12-22

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki SUGIYAMA

IPC: G02F1/065 ,  G02F1/025 ,  H04B10/50

CPC classification number: G02F1/065 ,  G02F1/025 ,  H04B10/501 ,  G02F2201/12

Abstract: An optical device includes a slot waveguide, and an electrode that has a coplanar structure including a signal electrode and a ground electrode disposed parallel to the slot waveguide. Furthermore, the optical device includes a plurality of electro-optical polymers each of which is inserted into a slot provided in the slot waveguide in a split state, and a bridge that is disposed in a boundary region located between the split electro-optical polymers and that electrically connects the ground electrode and another ground electrode.

公开(公告)号：US20230305228A1

公开(公告)日：2023-09-28

申请号：US18153680

申请日：2023-01-12

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Jianping WANG ,  Akira OKA ,  Hoshihiko TODA

IPC: G02B6/122

CPC classification number: G02B6/122 ,  G02B6/2938

Abstract: An optical device includes an input waveguide and an output waveguide. The optical device includes an interference region that includes an input unit optically coupled with the input waveguide, that includes an output unit optically coupled with the output waveguide, and that has a larger waveguide width than a waveguide width of the input waveguide and a waveguide width of the output waveguide. Further, the optical device includes an unnecessary light waveguide that is included in the output unit in the interference region and that is arranged parallel to the output waveguide. The unnecessary light waveguide is a single-mode waveguide that includes a rib portion and a slab portion with a smaller thickness than a thickness of the rib portion, and that guides only a fundamental mode of light.

公开(公告)号：US20230296927A1

公开(公告)日：2023-09-21

申请号：US18062748

申请日：2022-12-07

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki Sugiyama

IPC: G02F1/01

CPC classification number: G02F1/0147 ,  G02F1/011 ,  G02F1/0121 ,  G02F2201/063 ,  G02F2201/066 ,  G02F2201/12 ,  G02F2201/42

Abstract: 1An optical device includes a substrate, a dielectric substance that is laminated on the substrate, an optical waveguide that is surrounded by the dielectric substance, and a heater electrode that is disposed on the optical waveguide and that is surrounded by the dielectric substance. The optical waveguide is a rib type optical waveguide that includes a slab and a rib on the slab, that is located below the heater electrode, and that has a structure in which a width of the slab is less than or equal to 11 times a width of the rib.

公开(公告)号：US11726259B2

公开(公告)日：2023-08-15

申请号：US17164500

申请日：2021-02-01

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Takeshi Baba

IPC: G02B6/122 ,  G02B6/13 ,  H04B10/40 ,  H04J14/06 ,  G02B6/12

CPC classification number: G02B6/1228 ,  G02B6/13 ,  H04B10/40 ,  G02B2006/12097 ,  H04J14/06

Abstract: An optical circuit element formed on a substrate, the optical circuit element includes a first waveguide and a second waveguide, the second waveguide having a shape in a width direction, the shape being asymmetrical to the first waveguide. The first waveguide includes a first segment and a second segment, the first segment having a width that changes along a light propagation direction, the second segment continuous with the first segment. The second waveguide includes a coupled waveguide adjacent to the second segment of the first waveguide. At least one of the second segment and the coupled waveguide has a shape with a width that changes along the light propagation direction.

公开(公告)号：US11689293B2

公开(公告)日：2023-06-27

申请号：US17685043

申请日：2022-03-02

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Tomohisa Ishikawa

IPC: H04B10/2507 ,  H04B10/524 ,  H04B10/54 ,  H04B10/293 ,  H04B10/80

CPC classification number: H04B10/54 ,  H04B10/2935 ,  H04B10/808 ,  H04B10/2507 ,  H04B10/524

Abstract: A control device of modulating signal generates high-side signal and low-side signal. The high-side signal takes level in accordance with level of AC component of a monitor signal obtained by photoelectric conversion of modulated light, when the polarity of the AC component is positive, or its magnitude is zero. The high-side signal further takes constant level when the polarity of the AC component is negative. The low-side signal takes constant level when the polarity of the AC component is positive. The low-side signal further takes level in accordance with level of the AC component when the polarity of the AC component is negative, or its magnitude is zero. Then, the control device adjusts level of the modulating signal based on a greatest value of absolute values of levels taken by the high-side signal and a greatest value of absolute values of levels taken by the low-side signal.

公开(公告)号：US20230085007A1

公开(公告)日：2023-03-16

申请号：US17887763

申请日：2022-08-15

Applicant: Fujitsu Optical Components Limited

Inventor： Takasi SIMOYAMA

IPC: G02B6/122 ,  H01L31/0232 ,  H01L31/028 ,  H01L31/105

Abstract: A photodetector has a substrate, a light input layer formed as a first semiconductor over the substrate, the first semiconductor being transparent to a wavelength being used, and a light absorption layer formed as a second semiconductor on the light input layer, the second semiconductor having a bandgap smaller than that of the first semiconductor. The light absorption layer has a first region doped with a first conductivity-type impurity, a second region doped with a second conductive-type impurity different from the first conductive-type impurity, and an undoped region between the first region and the second region. The first region, the undoped region and the second region are arranged in a direction parallel to the substrate. The light absorption layer has a region having an effective refractive index higher than the rest of the light absorption layer between the first region and the second region.

公开(公告)号：US20230046400A1

公开(公告)日：2023-02-16

申请号：US17836074

申请日：2022-06-09

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki Sugiyama

IPC: G02F1/035 ,  G02F1/21

Abstract: An optical device includes a rib waveguide that is a thin-film lithium niobate (LN) crystal, a buffer layer that is laminated on the rib waveguide, and an electrode that applies voltage to the rib waveguide. The buffer layer includes a thick-film part that is laminated on a rib of the rib waveguide, and thin-film parts that are laminated on slabs of the rib waveguide, where the slabs are located on both sides of the rib, and that have smaller thicknesses than a thickness of the thick-film part.

公开(公告)号：US20220397781A1

公开(公告)日：2022-12-15

申请号：US17715336

申请日：2022-04-07

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Masaki SUGIYAMA

IPC: G02F1/035 ,  G02F1/21 ,  G02F1/225 ,  H04B10/50

Abstract: An optical device includes an optical waveguide, a buffer layer that is layered on the optical waveguide, and an opening that is formed at least in the buffer layer above a part near a side surface of the optical waveguide. The optical device further includes an electrode that is layered in the opening and that is configured to apply a signal to the optical waveguide and a silicon layer that is layered on the buffer layer excluding the opening.