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公开(公告)号：US11740491B2
公开(公告)日：2023-08-29
申请号：US17623507
申请日：2019-07-05
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Ai Yanagihara , Kenya Suzuki , Takashi Go , Keita Yamaguchi
CPC classification number: G02F1/0147 , G02B6/3596 , G02F1/136 , G02F1/3136 , G02B2006/12145 , G02B2006/12159
Abstract: An optical switch is configured by providing a planar lightwave circuit layer on a top surface of a Si substrate. The circuit layer forms, on the top surface of the substrate, an optical waveguide including an underclad layer, an optical waveguide core, and an overclad layer. The optical waveguide is provided to have a structure configuring a Mach-Zehnder interferometer. A heater is provided at a position just above an arm of the core on the top surface of the clad layer, and power supply electric wires are electrically connected to both ends of the heater. In a local portion including an interface between the clad layer and the top surface of the substrate, trench structure portions as concave grooves are provided.
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公开(公告)号：US20220413218A1
公开(公告)日：2022-12-29
申请号：US17778654
申请日：2019-11-26
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Takashi Go , Kenya Suzuki , Keita Yamaguchi , Ai Yanagihara
Abstract: A waveguide bend which has low loss while keeping the curvature radius small in a waveguide with a given A is realized. An optical waveguide has a straight waveguide and a waveguide bend connected to each other, and tapered waveguide bends inserted between the straight waveguide and the waveguide bend, a curvature radius of the tapered waveguide bend being equal to a curvature radius of the waveguide bend, a waveguide width of the tapered waveguide bend changing continuously from the waveguide width of the straight waveguide at the connection point to the waveguide width of the waveguide bend. A waveguide width of the waveguide bend is larger than a waveguide width of the straight waveguide at a connection point and the tapered waveguide bend and the straight waveguide are connected with an optical axis of the tapered waveguide bend and an optical axis of the straight waveguide being offset.
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公开(公告)号：US20220011508A1
公开(公告)日：2022-01-13
申请号：US17424733
申请日：2020-01-17
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Osamu Moriwaki , Manabu Oguma , Kenya Suzuki , Takashi Go , Yuichiro Ikuma
IPC: G02B6/125 , G02B6/12 , H04B10/079
Abstract: A wavelength monitoring circuit obtains a light output proportional to only an input optical signal, independent of wavelength, by adding a light split circuit to the configuration in the related art, or changing the light split circuit to a light trifurcation circuit. In addition, wavelength monitoring with high accuracy is possible while improving the resistance to noise. The extraction of the light output proportional to only the input optical signal is performed by a light split circuit for input light at the top stage of the wavelength monitoring circuit or a light split circuit for interference in a stage in the middle of the circuit. The changed light split circuit causes the MZI included in the wavelength monitoring circuit to operate in a state of losing the balance of the configuration or the optical signal level, and increases the signal level near the bottom portion of the transmission characteristics.
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公开(公告)号：US20210397065A1
公开(公告)日：2021-12-23
申请号：US17297817
申请日：2019-12-11
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Ai Yanagihara , Kenya Suzuki , Takashi Go , Keita Yamaguchi , Yuko Kawajiri
Abstract: The positions at which electrode pads are arranged can be made more flexible, and electrical interconnects to be installed can be reduced. In addition, the degree of integration of a chip increases, making it possible to realize a large-scale device (optical switch etc.). In an optical module of the present invention, an interposer (an electrical connection intermediary component with electrode pins attached onto upper and lower faces in an array) is laid over a chip that includes a device configured by using a planar lightwave circuit (PLC) fixed onto a fixing metal plate, and a control substrate for driving the device is laid over the interposer. These components are mechanically fixed by a fixing screw or the like, and the electrode pads of the chip and the control substrate are connected to each other via the interposer.
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公开(公告)号：US20210258663A1
公开(公告)日：2021-08-19
申请号：US17253449
申请日：2019-06-19
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Keita Yamaguchi , Kenya Suzuki , Takashi Go , Osamu Moriwaki , Ai Yanagihara
Abstract: An optical signal processing device is described herein for reducing electric wirings in an optical switch or an optical filter realized using an optical waveguide. The optical signal processing device includes an optical waveguide formed on a substrate. In the optical signal processing device, the optical waveguide includes at least one input port and at least one output port, a plurality of driven elements are provided including a phase shifter that produces a phase shift to an optical signal from the input port, each of the driven elements includes at least two control terminals, control wirings are provided to have control signals being time-division synchronized applied between the two control terminals, and the control wiring for accessing the driven element is shared by the plurality of driven elements.
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Patent Agency Ranking
公开(公告)号：US20250020865A1
公开(公告)日：2025-01-16
申请号：US18710066
申请日：2021-12-01
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Takashi Go , Kenya Suzuki , Keita Yamaguchi , Ai Yanagihara
IPC: G02B6/28
Abstract: There is provided a waveguide type optical coupler that maintains a constant branching ratio in a wide wavelength region without wavelength dependency and polarization dependency. A waveguide type optical coupler includes a Mach-Zehnder interferometer that includes two arm waveguides between two directional couplers. In the waveguide type optical coupler, waveguide widths of the two waveguides in a coupling portion of the directional coupler are different from each other.
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公开(公告)号：US11835761B2
公开(公告)日：2023-12-05
申请号：US17420371
申请日：2020-01-08
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Osamu Moriwaki , Kenya Suzuki , Takashi Go , Manabu Oguma , Yuichiro Ikuma
CPC classification number: G02B6/122 , G02B6/12007 , G02B2006/12104 , G02B2006/12164
Abstract: The invention provides a planar optical waveguide circuit capable of preventing part of the input signal light that has not been combined in the waveguide and propagates as leaked light from interfering with the output signal. A planar optical waveguide circuit having an optical waveguide embedded in a cladding layer includes: a plurality of parallel output optical waveguides configured to emit light from a same end face; a groove having a reflective interface formed at an angle of +45 degrees relative to the output optical waveguides and configured to reflect leaked light propagating in the cladding layer; and a groove having a reflective interface formed at an angle of −45 degrees, the reflective interface formed at an angle of +45 degrees, the output optical waveguide, and the reflective interface formed at −45 degrees being arranged repeatedly in that order.
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18.发明公开公开(公告)号：US20230259017A1
公开(公告)日：2023-08-17
申请号：US18040034
申请日：2020-08-05
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Takashi Go , Ai Yanagihara , Keita Yamaguchi , Kenya Suzuki
CPC classification number: G03F1/42 , G03F9/7076 , G03F9/708 , G02B6/13
Abstract: In an optical circuit divided into a plurality of partial circuits, an optical waveguide having a low optical loss at a connection portion is provided. A photomask in which a waveguide pattern of an optical circuit is divided into a plurality of regions and drawn, the photomask including a waveguide pattern for drawing a joint region in which a waveguide width changes as a waveguide goes toward an outer peripheral portion, to connect a plurality of the waveguides divided and drawn to each other, in which the waveguides are connected to each other by overlapping the joint regions of two of the photomasks and performing exposure.
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公开(公告)号：US20220357601A1
公开(公告)日：2022-11-10
申请号：US17623507
申请日：2019-07-05
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Ai Yanagihara , Kenya Suzuki , Takashi Go , Keita Yamaguchi
Abstract: An optical switch is configured by providing a planar lightwave circuit layer on a top surface of a Si substrate. The circuit layer forms, on the top surface of the substrate, an optical waveguide including an underclad layer, an optical waveguide core, and an overclad layer. The optical waveguide is provided to have a structure configuring a Mach-Zehnder interferometer. A heater is provided at a position just above an arm of the core on the top surface of the clad layer, and power supply electric wires are electrically connected to both ends of the heater. In a local portion including an interface between the clad layer and the top surface of the substrate, trench structure portions as concave grooves are provided.
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公开(公告)号：US20220086538A1
公开(公告)日：2022-03-17
申请号：US17420639
申请日：2020-01-08
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Osamu Moriwaki , Takashi Saida , Kenya Suzuki , Takashi Go , Manabu Oguma , Yuichiro Ikuma
IPC: H04Q11/00 , H04B10/572 , G02B6/293
Abstract: A wavelength monitoring apparatus includes a wavelength monitoring circuit. The wavelength monitoring circuit includes: a split circuit that splits an input optical signal into two; an optical delay circuit that applies a delay time difference to the two split optical signals; and a two-input two-output optical multiplexer/demultiplexer circuit that outputs a result of applying multiplexing interference to the optical signals to which the delay time difference has been applied. The wavelength monitoring apparatus further includes photoelectric conversion elements that perform photoelectric conversions on the two optical signals output from the wavelength monitoring circuit so as to output electrical signals. The wavelength monitoring apparatus is configured to obtain the wavelength of the optical signal, by calculating a ratio between two electrical outputs of the photoelectric conversion elements and referring to a correspondence table indicating wavelengths of optical signals input to the wavelength monitoring circuit and ratios between electrical outputs.
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