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公开(公告)号：US12184338B2
公开(公告)日：2024-12-31
申请号：US17991263
申请日：2022-11-21
Applicant: FUJITSU OPTICAL COMPONENTS LIMITED
Inventor： Akira Oka
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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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
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.
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公开(公告)号：US11662522B2
公开(公告)日：2023-05-30
申请号：US17454734
申请日：2021-11-12
Applicant: Fujitsu Optical Components Limited
Inventor： Akira Oka
CPC classification number: G02B6/2773 , G02B6/126 , G02B6/1228 , G02B6/14 , G02B6/2726 , G02B2006/12097
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：US11714234B2
公开(公告)日：2023-08-01
申请号：US17521050
申请日：2021-11-08
Applicant: Fujitsu Optical Components Limited
Inventor： Akira Oka
IPC: G02B6/126
CPC classification number: 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：US11543593B2
公开(公告)日：2023-01-03
申请号：US17177488
申请日：2021-02-17
Applicant: Fujitsu Optical Components Limited
Inventor： Akira Oka
Abstract: An optical device has a first photonic waveguide provided on a substrate, a second photonic waveguide provided on the substrate and extending side by side with the first photonic waveguide, and a looped waveguide continuously connecting the first photonic waveguide and the second photonic waveguide on the substrate, wherein a width of at least one of the first photonic waveguide or the second photonic waveguide varies continuously along an optical axis, between a first position located at a side opposite to the looped waveguide and a second position connected to the looped waveguide, and wherein cross sections of the first photonic waveguide and the second photonic waveguide are congruent at the second position, and are incongruent at the first position.
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公开(公告)号：US11460635B2
公开(公告)日：2022-10-04
申请号：US17160057
申请日：2021-01-27
Applicant: Fujitsu Optical Components Limited
Inventor： Akira Oka
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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公开(公告)号：US11307355B2
公开(公告)日：2022-04-19
申请号：US17178743
申请日：2021-02-18
Applicant: Fujitsu Optical Components Limited
Inventor： Akira Oka
Abstract: A 90-degree optical hybrid includes two optical splitters that respectively split inputted light into two beams, two optical combiners that respectively combine two beams of inputted light and thereby output two beams of interfering light respectively, and four arm waveguides that input light splitted by any of the two optical splitters into any of the two optical combiners. Each of the four arm waveguides has a bend waveguide arranged at its center and a plurality of optical waveguides including a tapered waveguide having a width that decreases toward the bend waveguide. Both ends of each of the plurality of optical waveguides are respectively in contact with a end surface of any one of the two optical splitter, the two optical combiners, the bend waveguide and the other of the plurality of optical waveguides, and each of the plurality of waveguides is the tapered waveguide or a linear waveguide.
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公开(公告)号：US11223425B2
公开(公告)日：2022-01-11
申请号：US17143720
申请日：2021-01-07
Applicant: Fujitsu Optical Components Limited
Inventor： Akira Oka
IPC: H04B10/60
Abstract: An optical circuit device includes a first to fourth optical couplers, wherein the first optical coupler splits a first input light into a first output beam and a second output beam with a 90-degree phase difference therebetween, and the second optical coupler splits a second input light into a third output beam and a fourth output beam with a 180-degree phase difference therebetween. The third optical coupler combines one of the first and second output beams and one of the third and fourth output beams, and outputs a first optical signal and a second optical signal having a 180-degree phase shift from each other. The fourth optical coupler combines the other of the first and second output beams and the other of the third and fourth output beams, and outputs a third optical signal and a fourth optical signal having a 180-degree phase shift from each other.
