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公开(公告)号：US10082623B2
公开(公告)日：2018-09-25
申请号：US15514563
申请日：2015-09-15
Applicant: NEC Corporation
Inventor： Tomoaki Kato , Shigeru Nakamura
CPC classification number: G02B6/12007 , G02B6/122 , G02B6/1228 , G02B6/125 , G02B6/2813 , G02B6/29344 , G02B6/2938 , G02B2006/12097 , G02B2006/12164 , H04B10/40
Abstract: Provided are a practical rib type optical waveguide in which polarization dependence and wavelength dependence and the like are small and an optical multiplexer/demultiplexer using the same. An optical waveguide type optical multiplexer/demultiplexer of the present invention includes a substrate, M input optical waveguides and N output optical waveguides including a single mode rib type optical waveguide, multi-mode optical interference regions including a rib type optical waveguide, and reversible tapered regions that smoothly connect the input/output optical waveguides to the multi-mode optical interference regions and include M×N rib type optical waveguides, and both side surfaces of the multi-mode optical interference region are respectively formed in a stepped shape.
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公开(公告)号：US09411099B2
公开(公告)日：2016-08-09
申请号：US14611411
申请日：2015-02-02
Applicant: NEC Corporation
Inventor： Kenji Mizutani , Shigeru Nakamura
CPC classification number: G02B6/136 , G02B6/1228 , G02B2006/12097
Abstract: An optical waveguide of the present invention is an optical waveguide having a first rib and a second rib being provided on a slab layer along one direction from one side to the other side and a barrier layer being connected between said first rib and said second rib, in which: the first rib includes a first taper part having a width widening from a first end in said one side to a second end connected with said barrier layer; and the second rib includes a first layer and a second layer laminated on a face of said slab layer in turn.
Abstract translation: 本发明的光波导是具有第一肋和第二肋的光波导，第一肋和第二肋沿着从一侧到另一侧的一个方向设置在板状层上，阻挡层连接在所述第一肋和所述第二肋之间， 其中：第一肋包括第一锥形部，其具有从所述一侧的第一端到与所述阻挡层连接的第二端的宽度加宽; 并且第二肋包括依次层叠在所述板层的表面上的第一层和第二层。
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公开(公告)号：US20250131764A1
公开(公告)日：2025-04-24
申请号：US18725186
申请日：2022-03-02
Applicant: NEC Corporation
Inventor： Shigeru Nakamura
IPC: G06V40/12 , G01B9/02091 , G06V10/75 , G06V40/13
Abstract: An image processing apparatus comprises: an acquisition unit 11 acquires a three-dimensional luminance data of skin, the data being generated by optical coherence tomography performed by irradiating the skin of a finger with an optical beam in a two-dimensionally scanning manner; a first extraction unit 12 extracts from the three-dimensional luminance data of the skin, a pattern image of a pattern of the skin; a second extraction unit 213 extracts from the three-dimensional luminance data of the skin, a normal direction of a surface of the skin; and a generation unit 214 moves a position of a pixel included in the pattern image based on the normal direction to generate a post-move pattern image.
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公开(公告)号：US12213763B2
公开(公告)日：2025-02-04
申请号：US17908994
申请日：2020-03-25
Applicant: NEC Corporation
Inventor： Shigeru Nakamura
Abstract: The optical interference tomographic imaging device is provided with: a wavelength sweeping laser light source; a branching unit that branches light emitted from the wavelength sweeping laser light source to object light and reference light; an irradiation unit that scans a predetermined range by irradiating different positions on the surface of the measurement target object with the object light outputted from the branching unit; a measurement unit that, after irradiation on the measurement target object, generates information about a change in the interference light intensity ratio between the reference light and the object light scattered from the measurement target object; and a control unit that, on the basis of the information about the change in the interference light intensity ratio generated by the measurement unit, acquires structure data in the depth direction of the measurement target object.
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公开(公告)号：US11892290B2
公开(公告)日：2024-02-06
申请号：US17291071
申请日：2019-10-31
Applicant: NEC Corporation
Inventor： Shigeru Nakamura
IPC: G01B9/02 , G01B9/02091 , G01N21/47 , A61B3/10 , A61B3/12 , A61B5/00 , A61B5/1172 , G01N21/17
CPC classification number: G01B9/02091 , G01B9/02043 , G01B9/02044 , G01N21/47 , A61B3/102 , A61B3/12 , A61B5/0066 , A61B5/1172 , G01N2021/1787
Abstract: An optical coherence tomography apparatus includes a branching and merging device that branches a light beam emitted from a wavelength sweeping laser light source into an object light beam and a reference light beam, a balanced photodetector that generates information about a change in an intensity ratio of interference light beams, which are generated by the interference between the object light beam and the reference light beam, wherein the object light beam is scattered from the measurement object after being transmitted through the transparent substrate including a structure that changes a thickness, and a control unit that acquires structural data of the measurement object in a depth direction based on the information about the change in the intensity ratio of the interference light beams and connects the structural data while moving an irradiation position of the object light beam with a position of the above structure as a reference.
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Patent Agency Ranking
公开(公告)号：US11933610B2
公开(公告)日：2024-03-19
申请号：US17876453
申请日：2022-07-28
Applicant: NEC CORPORATION
Inventor： John Kenji David Clark , Shigeru Nakamura
IPC: G01B9/02091 , G01B9/02001
CPC classification number: G01B9/02091 , G01B9/02007
Abstract: A swept-source optical coherence tomography (SS-OCT) apparatus includes a plurality of wavelength-tunable light sources. The SS-OCT apparatus includes a first optical coupler configured to receive an output from each of the plurality of wavelength-tunable light sources. The optical coupler is configured to split the received output from the plurality of wavelength-tunable light sources into a reference optical path and a sample optical path. The sample optical path is configured to illuminate a sample. The SS-OCT apparatus includes a second optical coupler configured to receive return optical signals from the reference optical path and the sample optical path, and to output an optical interference signal. The SS-OCT apparatus includes a detector configured to detect the optical interference signal; and a controller configured to receive an electrical signal based on the detected optical interference signal. The controller is configured to generate a depth profile of the sample using compressed sensing.
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公开(公告)号：US20230273010A1
公开(公告)日：2023-08-31
申请号：US18019687
申请日：2020-08-18
Applicant: NEC Corporation
Inventor： Atsufumi SHIBAYAMA , Shigeru Nakamura
IPC: G01B9/02091 , G01B9/02
CPC classification number: G01B9/02091 , G01B9/02044
Abstract: This optical interference tomographic imaging device includes: a wavelength-sweeping laser light source; a merged light generation means that branches the laser light into two branched lights, and outputs merged light; a branching means that branches the merged light into object light and reference light; an irradiation means that irradiates a prescribed scanning range of an object being measured with the object light; a light receiver that generates information relating to the change in intensity ratio of interference light between the reference light and the object light scattered from the object being measured; and a control means that, on the basis of the information generated by the light receiver, acquires depth-direction structure data pertaining to the object being measured.
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公开(公告)号：US11703450B2
公开(公告)日：2023-07-18
申请号：US16772684
申请日：2018-12-18
Applicant: NEC Corporation
Inventor： Shigeru Nakamura
CPC classification number: G01N21/4795 , G02B27/1013 , G01N2021/1787
Abstract: An optical beam controller includes: an optical multiple-beam generator generating a plurality of wavelength-swept optical beams; and an optical frequency difference setter setting an optical frequency difference in any combination of the plurality of optical beams in such a way as to be larger than a band of a photodetector that receives an optical beam.
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公开(公告)号：US11417144B2
公开(公告)日：2022-08-16
申请号：US17431784
申请日：2019-02-22
Applicant: NEC Corporation
Inventor： Yoshimasa Ono , Shigeru Nakamura , Atsufumi Shibayama , Junichi Abe
Abstract: A technique for accurately extracting a fingerprint image for accurate authentication from 3D tomographic luminance data of a finger at a high speed. A processing apparatus (11) according to the present disclosure includes means for, after performing edge detection processing on a tomographic image (101, 102, . . . 10 k, . . . , 10n) at each depth, calculating the total number of edge pixels in the tomographic image from 3D (three-dimensional) tomographic luminance data, and acquiring depth dependence of the number of edges (111, 112), and means for extracting a tomographic image having a striped pattern from the depth dependence of the number of edges and the 3D tomographic luminance data.
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公开(公告)号：US11374377B2
公开(公告)日：2022-06-28
申请号：US16606290
申请日：2017-04-20
Applicant: NEC CORPORATION
Inventor： Emmanuel Le Taillandier De Gabory , Shigeyuki Yanagimachi , Shigeru Nakamura , Keiichi Matsumoto
Abstract: It is necessary to reduce the power consumption of a plurality of optical amplifiers when there is a difference in the required pumping power between the plurality of optical amplifiers; therefore, an optical amplifying apparatus according to an exemplary aspect of the invention includes a plurality of optical amplifying means for amplifying a plurality of optical signals, each of the plurality of optical amplifying means including a gain medium; a plurality of laser light generating means for generating a plurality of laser beams; at least one optical coupling means for coupling the plurality of laser beams variably in accordance with a coupling factor and outputting a plurality of excitation light beams, each of the plurality of excitation light beams exciting the gain medium; and controlling means for controlling the coupling factor and an output power of each of the plurality of laser light generating means.
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