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1.发明申请公开(公告)号：US20230056455A1
公开(公告)日：2023-02-23
申请号：US17842977
申请日：2022-06-17
Applicant: FUJITSU OPTICAL COMPONENTS LIMITED
Inventor： Akira OKA
IPC: G02B6/125
Abstract: A waveguide element includes a first waveguide and a second waveguide. The first waveguide includes a first main rib and a first slab that has a smaller thickness than that of the first main rib and in which a slab mode of light propagates. The second waveguide includes a second main rib that is optically coupled with the first main rib and in which the light propagates, a second slab that has a smaller thickness than that of the second main rib, that is optically coupled with the first slab, and in which the slab mode propagates, and a side rib that has a larger thickness than that of the second slab. The slab mode that propagates through the second slab transitions to the side rib in accordance with travel of the light that propagates in the first main rib and the second main rib.
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公开(公告)号：US20240377594A1
公开(公告)日：2024-11-14
申请号：US18626932
申请日：2024-04-04
Applicant: FUJITSU OPTICAL COMPONENTS LIMITED
Inventor： Akira OKA
Abstract: An optical device includes a first channel waveguide, a second channel waveguide, a slab generator, and a rib waveguide connected to the slab generator. The second channel waveguide includes a first connection connected to the first channel waveguide and a second connection connected to the slab generator, and the second channel waveguide is wider at the second connection than at the first connection. A slab region of the slab generator includes a third connection connected to the rib waveguide, and the slab region widens from the second connection of the second channel waveguide toward the third connection. The effective refractive indexes of the waveguide modes at the first connection are larger in the order of TE0, TM0, and TE1, meanwhile the effective refractive indexes of the waveguide modes at the second and third connections are larger in the order of TE0, TE1, and TM0.
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3.发明公开公开(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.
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公开(公告)号：US20220206219A1
公开(公告)日：2022-06-30
申请号：US17521050
申请日：2021-11-08
Applicant: Fujitsu Optical Components Limited
Inventor： Akira OKA
IPC: G02B6/126
Abstract: An optical waveguide device includes a pair of waveguides. One of the waveguides includes a first core formed in a conversion region and a third core formed in an exit region. The other of waveguides includes a second core formed in the conversion region and a fourth core formed in the exit region. Cross-sectional areas of the first and second cores are different from each other at an input end. Distributions of a refractive index of the first and second cores are respectively asymmetric in a perpendicular direction. A quantitative relation provided at the input end between an effective refractive index of an odd mode of TE0 and an effective refractive index of an even mode of TM0 is opposite to the quantitative relation provided at the output end. Cross-sectional areas of the third and fourth cores are different from each other at an output end.
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公开(公告)号：US20210325607A1
公开(公告)日：2021-10-21
申请号：US17160057
申请日：2021-01-27
Applicant: Fujitsu Optical Components Limited
Inventor： Akira OKA
IPC: G02B6/122
Abstract: An optical waveguide device that is implemented between a slot waveguide and a rectangular waveguide includes: a tapered portion and a separation portion. The tapered portion includes first and second cores that are respectively coupled to cores of the slot waveguide and formed in parallel each other. The separation portion includes third and fourth cores that are respectively coupled to the first and second cores. Cross-sectional areas of the first and second cores are substantially equal each other at an input end. The cross-sectional area of the first core is larger than that of the second core at an output end. A shape of a cross section of the first core changes continuously between the input end and the output end in the tapered portion. A spacing between the third core and the fourth core is continuously extended in the separation portion.
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Patent Agency Ranking
公开(公告)号：US20240377584A1
公开(公告)日：2024-11-14
申请号：US18630447
申请日：2024-04-09
Applicant: FUJITSU OPTICAL COMPONENTS LIMITED
Inventor： Akira OKA
IPC: G02B6/122
Abstract: An optical device includes an optical waveguide that is constituted of a cladding and a core formed on a substrate. The optical waveguide includes an input waveguide, an attenuator section that is connected to the input waveguide, a removing section that is connected to the attenuator section, and an output waveguide that is connected to the removing section. The attenuator section is configured to have more waveguide modes that are guided on a cross section perpendicular to a traveling direction of light in a connecting portion connected to the removing section compared to a connecting portion connected to the input waveguide. The removing section is configured to have less waveguide modes that are guided on a cross section perpendicular to a traveling direction of light in a connecting portion connected to the output waveguide compared to a connecting portion connected to the attenuator section.
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公开(公告)号：US20230244032A1
公开(公告)日：2023-08-03
申请号：US18064085
申请日：2022-12-09
Applicant: Fujitsu Optical Components Limited
Inventor： Akira OKA
CPC classification number: G02B6/1228 , G02B6/1223 , G02B6/125 , G02B2006/12097
Abstract: An optical device includes a transition unit in which a first waveguide and a second waveguide are disposed in an overlapped manner such that a magnitude relationship of an effective refractive index between the vertical modes propagating the first waveguide and the vertical modes propagating the second waveguide is inverted at the positions of input and output. The transition unit allows, at the input, the second waveguide to be a single mode waveguide and allows, at the output, the second waveguide to be a multi-mode waveguide through which TM0 light in the maximum vertical mode and light in a higher-order mode propagate. The optical device includes a removing unit that allows the second waveguide to be a single mode waveguide through which the TM0 light propagates by removing the light in the higher-order mode from the light received from the transition unit.
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公开(公告)号：US20220206224A1
公开(公告)日：2022-06-30
申请号：US17454734
申请日：2021-11-12
Applicant: Fujitsu Optical Components Limited
Inventor： Akira OKA
Abstract: An optical waveguide device includes first and second waveguides formed parallel to each other. The first waveguide includes a first rib and a first slab. The first slab is formed in a region between the first rib and the second waveguide. The second waveguide includes a second rib, a second slab and a third slab. The second rib is provided between the second slab and the third slab. The first and second slabs are integrally formed. At one end of the optical waveguide device, a first effective refractive index that indicates an effective refractive index of a TEi mode in the first waveguide is higher than a second effective refractive index that indicates an effective refractive index of a TEj mode in the second waveguide. At another end, the first effective refractive index is lower than the second effective refractive index.
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公开(公告)号：US20240230987A1
公开(公告)日：2024-07-11
申请号：US18516109
申请日：2023-11-21
Applicant: FUJITSU OPTICAL COMPONENTS LIMITED
Inventor： Tatsuya ITO , Akira OKA
CPC classification number: G02B6/036 , G02B6/4201
Abstract: An optical device includes a core formed on a substrate, a cladding layer covering the core, and a passivation layer formed on the cladding layer. The optical device includes a spot size converter that causes an increase in spot size of a light, which is guided through the core, toward end portion of the substrate. The passivation layer has a higher material refractive index than the cladding layer, and is formed in region excluding at least upper portion of the spot size converter.
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公开(公告)号：US20230208529A1
公开(公告)日：2023-06-29
申请号：US17991263
申请日：2022-11-21
Applicant: FUJITSU OPTICAL COMPONENTS LIMITED
Inventor： Akira OKA
CPC classification number: H04B10/615 , G02B6/4206 , G02F1/217 , G02F1/225 , G02B27/10
Abstract: An optical 90-degree hybrid includes two splitters, two combiners and four arm waveguides that connect output ports of the splitters and input ports of the combiners. Each of the splitters, the arm waveguides, and the combiners is a part of an optical waveguide. The optical waveguide is configured so that the phase error generated in the splitters due to wavelength change is suppressed by the phase error generated in the arm waveguides due to the wavelength change. The optical waveguide is further configured so that the phase error generated in the splitters due to deviation of a structure parameter from a certain value (e.g., design value) is suppressed by the phase error generated in the arm waveguides due to the deviation.
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