公开(公告)号：US20250060620A1

公开(公告)日：2025-02-20

申请号：US18765935

申请日：2024-07-08

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Masaki SUGIYAMA ,  Suguru AKIYAMA

IPC: G02F1/035

Abstract: An optical device has a first chip including a first waveguide and a first electrode, and a second chip mounted on the first chip and including a second waveguide and a second electrode. The second waveguide has an electro-optic effect higher than an electro-optic effect of the first waveguide and has a return structure that places an end of the second waveguide at an end face of the second chip. The second waveguide has been optically coupled to the first waveguide at the end face. The second electrode has a return structure that places an end of the second electrode at the end face, and the second electrode and the first electrode are electrically connected to each other in an area where the end of the second electrode has been placed.

公开(公告)号：US20240407104A1

公开(公告)日：2024-12-05

申请号：US18666312

申请日：2024-05-16

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Masaki SUGIYAMA

IPC: H05K1/18 ,  G02F1/035 ,  H01R12/62 ,  H05K1/02

Abstract: An optical module includes a first component, a second component, and an FPC that electrically connects the first component and the second component. The FPC includes a signal pad, a ground pad, a signal line, a ground pattern, a first coverlay including a first protrusion part, and a second coverlay including a second protrusion part. The first protrusion part covers a region on the FPC where the signal line is disposed, and protrudes at a location where the signal pad is disposed, toward an end part of the FPC on the first component side than the region where the signal line is disposed. The second protrusion part protrudes at a location where the signal pad is disposed, toward an end part of the FPC on the first component side, and covers a region on the ground pattern facing at least the signal pad.

公开(公告)号：US20240353697A1

公开(公告)日：2024-10-24

申请号：US18626916

申请日：2024-04-04

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Kensuke OGAWA

IPC: G02F1/025 ,  G02F1/015 ,  H04B10/43

CPC classification number: G02F1/025 ,  G02F1/0155 ,  H04B10/43

Abstract: An optical modulator element includes a rib optical waveguide, a first thin film, a first high-concentration doped region, and a first metal electrode. The rib optical waveguide includes a rib portion having a PN junction, a P-type slab region connected to a P-type region of the rib portion, and an N-type slab region connected to an N-type region of the rib portion. The first thin film is formed on the P-type slab region and has electron affinity different from electron affinity of a material for the P-type slab region. The first high-concentration doped region is a region in the P-type slab region, the region being at a position separate from the rib portion. The first metal electrode is electrically connected to the first high-concentration doped region positioned outward in the P-type slab region having the first thin film formed over the P-type slab region.

公开(公告)号：US20240272512A1

公开(公告)日：2024-08-15

申请号：US18406795

申请日：2024-01-08

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Nobuaki MITAMURA ,  Kazumasa SATO

IPC: G02F1/225 ,  G02F1/01 ,  G02F1/21

CPC classification number: G02F1/2252 ,  G02F1/0136 ,  G02F1/2257 ,  G02F1/212

Abstract: An optical device has an optical modulator element and an optical receiver element. The optical modulator element includes a first optical waveguide extending to a first end face, a first inter-element waveguide extending to a second end face, and an optical modulator including an electro-optic material. The optical receiver element includes a second optical waveguide extending to a third end face, a second inter-element waveguide extending to a fourth end face, an optical receiver, and a polarization element. In the optical device, the first inter-element waveguide and the second inter-element waveguide have been connected to each other by being butted against each other.

公开(公告)号：US20240264506A1

公开(公告)日：2024-08-08

申请号：US18394665

申请日：2023-12-22

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： NOBUAKI MITAMURA

IPC: G02F1/21 ,  G02F1/225

CPC classification number: G02F1/212 ,  G02F1/2255 ,  H04B10/40

Abstract: An optical device includes a substrate having an optical waveguide formed on a substrate surface, a buffer layer that is laminated on the optical waveguide, an electrode that is formed on the buffer layer, an insulating layer that covers the electrode, and an adhesion layer that is formed between the electrode and the insulating layer.

公开(公告)号：US12025866B2

公开(公告)日：2024-07-02

申请号：US17862903

申请日：2022-07-12

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Masaki Sugiyama

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

CPC classification number: G02F1/0356 ,  G02F1/212 ,  G02F1/2255

Abstract: An optical device includes an optical waveguide that is a rib type and that is formed of a thin film lithium niobate (LiNbO3: LN) substrate using a thin film LN crystal, and a buffer layer that is laminated on the optical waveguide. Furthermore, the optical device includes an electrode that is laminated on the buffer layer and that applies a voltage to the optical waveguide, and a gettering site that is disposed parallel to the optical waveguide and that traps an electric charge inside the optical waveguide.

公开(公告)号：US12021562B2

公开(公告)日：2024-06-25

申请号：US17839549

申请日：2022-06-14

Applicant: Fujitsu Optical Components Limited

Inventor： Akira Oka

IPC: H04B10/40 ,  G02B6/28 ,  H04B10/25

CPC classification number: H04B10/40 ,  G02B6/2852 ,  H04B10/25891

Abstract: A tap coupler includes a mode generation unit, a separation unit, and an output unit. The mode generation unit generates, in accordance with a discontinuous portion disposed on a travelling path of signal light that is propagating, a first mode of the signal light and a second mode that is different from the first mode. The separation unit separates, when the first mode and the second mode are input from the mode generation unit, the first mode and the second mode. The output unit outputs branch light in accordance with a transition of the second mode received from the separation unit.

公开(公告)号：US20240134116A1

公开(公告)日：2024-04-25

申请号：US18235930

申请日：2023-08-20

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Masaki SUGIYAMA

IPC: G02B6/122

CPC classification number: G02B6/1228

Abstract: An optical device includes a first layer, a second layer, two first waveguides arranged in a side by side manner in the first layer; two second waveguides arranged in a side by side manner in the second layer, and a third waveguide arranged between the first waveguides and between the second waveguides. The first waveguide includes a first tapered waveguide and a second tapered waveguide. The third waveguide includes a third tapered waveguide that is disposed side by side with the second tapered waveguides. The first tapered waveguide has a width that is gradually narrower as the first tapered waveguide is away from a joining point with the second tapered waveguide. The second tapered waveguide has a width that is gradually narrower as the second tapered waveguide is away from a joining point with the first tapered waveguide. The third tapered waveguide has a width that is gradually wider.

公开(公告)号：US20240072900A1

公开(公告)日：2024-02-29

申请号：US18216972

申请日：2023-06-30

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Daisuke MATSUKAWA

IPC: H04B10/291 ,  H04B10/079

CPC classification number: H04B10/2912 ,  H04B10/07955 ,  H04B2210/003

Abstract: An optical amplifier includes a first path and a second path, and an amplification unit that is arranged on one of the first path and the second path. The amplifier includes a first switch that is arranged on an input stage of the amplification unit, and that switches a third path that connects between the first path and the amplification unit or a fourth path that connects between the second path and the amplification unit. The amplifier includes a second switch that is arranged on an output stage of the amplification unit and that switches a fifth path that connects between the first path and the amplification unit or a sixth path that connects between the second path and the amplification unit. The first switch switches the third path over to the fourth path, and the second switch switches the fifth path to the sixth path.

公开(公告)号：US11892716B2

公开(公告)日：2024-02-06

申请号：US17568261

申请日：2022-01-04

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki Sugiyama

IPC: G02F1/035 ,  G02B6/12 ,  G02B6/13

CPC classification number: G02F1/035 ,  G02B6/13 ,  G02B2006/1204

Abstract: An optical device includes a substrate, a layered structure provided on the substrate and including an intermediate layer, an optical waveguide formed of a thin crystal film having an electro-optic effect, and a buffer layer stacked in this order, and an electrode provided on or above the buffer layer and configured to apply a direct current voltage to the optical waveguide. The resistivity of the intermediate layer is higher than the resistivity of the buffer layer.