公开(公告)号：US20210194218A1

公开(公告)日：2021-06-24

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

IPC: H01S5/50 ,  H01S5/40 ,  H01S5/04 ,  H01S5/026

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.

公开(公告)号：US20190221987A1

公开(公告)日：2019-07-18

申请号：US16334417

申请日：2016-09-20

Applicant: NEC Corporation

Inventor： Emmanuel LE TAILLANDIER DE GABORY ,  Shigeru NAKAMURA ,  Shigeyuki YANAGIMACHI ,  Keiichi MATSUMOTO

IPC: H01S3/067 ,  G02B6/02 ,  H01S3/094 ,  H01S3/00 ,  H01S3/10 ,  H01S3/13 ,  H01S3/16

CPC classification number: H01S3/06737 ,  G02B6/02 ,  H01S3/0064 ,  H01S3/06758 ,  H01S3/094007 ,  H01S3/094065 ,  H01S3/094069 ,  H01S3/09415 ,  H01S3/10007 ,  H01S3/10015 ,  H01S3/1301 ,  H01S3/1302 ,  H01S3/1608

Abstract: To solve the problem that the power consumption of optical amplifiers is not optimized over the life time of an amplifier, the optical amplifier includes a gain medium for amplifying a plurality of optical channels, the gain medium including a plurality of cores through which the plurality of optical channels to propagate respectively and a cladding area surrounding the plurality of cores, a monitor that monitors the temperature of the optical amplifier and producing a monitoring result, a first light source that emits a first light beam to excite the cladding area, a second light source that emits a plurality of second light beams to excite each of the plurality of cores individually, and a controller that controls the first light source and the second light source based on the produced monitoring result.

公开(公告)号：US20170276872A1

公开(公告)日：2017-09-28

申请号：US15509253

申请日：2015-09-11

Applicant: NEC Corporation

Inventor： Shigeru NAKAMURA

IPC: G02B6/125

CPC classification number: G02B6/125 ,  G02B2006/12061 ,  G02B2006/1209 ,  G02B2006/12097

Abstract: In order to solve the problem of making optical signals pass at a low loss and low polarization dependence, this optical circuit element is configured from rib-type optical waveguides, each of which is configured from a core region, including a planar slab and protruding ribs, and cladding regions that are provided in contact with the top and the bottom of the core region. A first optical waveguide that is provided in the optical circuit element is provided with a plurality of intersection points where the first optical waveguide intersects optical waveguides other than the first optical waveguide, said intersection points being disposed on one straight line. The core width of the first optical waveguide in a region between the intersection points is larger than the core width of the first optical waveguide in regions other than the region between the intersection points, the first optical waveguide regions having different core widths are connected by means of a taper optical waveguide wherein the core width monotonously changes, and the thickness of the slab of the first optical waveguide in the region having the large core width is larger than the thickness of the slab of the first optical waveguide in the regions other than the region having the large core width.

公开(公告)号：US20240200928A1

公开(公告)日：2024-06-20

申请号：US17909832

申请日：2020-03-24

Applicant: NEC Corporation

Inventor： Shigeru NAKAMURA

IPC: G01B9/02091 ,  A61B3/10 ,  G01B9/02001

CPC classification number: G01B9/02091 ,  A61B3/102 ,  G01B9/02001

Abstract: The optical coherence tomography apparatus (100) includes a splitter/merger (104), which splits an object light beam from a wavelength sweeping laser light source (101) into a plurality of object light beams, an optical spectrum data generation unit (110), which generates information on wavelength dependence of the intensity difference among a plurality of interference light beams generated by an interference between an object light beam and a reference light beam, wherein the object light beam is generated by merging the plurality of object light beams after the plurality of object light beams are radiated to different positions on the surface of a measurement target object (200) and then scattered, and a control unit (111), which acquires structural data in the depth direction based on information on wavelength dependence and connects a plurality of sets of acquired structural data while moving the radiation position of the plurality of object light beams.

公开(公告)号：US20230102868A1

公开(公告)日：2023-03-30

申请号：US17908994

申请日：2020-03-25

Applicant: NEC Corporation

Inventor： Shigeru NAKAMURA

IPC: G01B9/02 ,  A61B5/00 ,  A61B3/10

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.

公开(公告)号：US20220065615A1

公开(公告)日：2022-03-03

申请号：US17413133

申请日：2018-12-20

Applicant: NEC Corporation

Inventor： Shigeru NAKAMURA

IPC: G01B9/02 ,  G02B27/14 ,  G02B27/10 ,  G02B6/26

Abstract: An optical coherence tomography device is provided with a split beam generating means which splits a beam emitted from a single light source into at least four split beams and outputs these, a measurement beam irradiating means which irradiates measurement beams onto different positions of a measurement target through a mechanism that can change the position of said measurement beams on the measurement target, a reference beam irradiating means which irradiates at least two of the at least four split beams that are not the measurement beams onto a reference beam mirror as reference beams, and an optical spectrum data generating means which acquires depth-direction structural data about the measurement target from interference light obtained by causing one of the reference beams reflected by the reference beam mirror to interfere with each of the measurement beams reflected or scattered by the measurement target.

公开(公告)号：US20190140418A1

公开(公告)日：2019-05-09

申请号：US16095175

申请日：2016-04-21

Applicant: NEC Corporation

Inventor： Emmanuel LE TAILLANDIER DE GABORY ,  Shigeru NAKAMURA

IPC: H01S3/10 ,  H01S3/067 ,  H01S3/094 ,  H01S3/0941

Abstract: In order to solve the problem that the power consumption of optical amplifiers is not optimized over the life time of a network whose capacity in use varies, an optical amplifier according to an exemplary aspect of the invention includes a gain medium for amplifying a plurality of optical channels, the gain medium including a plurality of cores through which the plurality of optical channels to propagate respectively and a cladding area surrounding the plurality of cores; monitoring means for monitoring the plurality of optical channels inputted into the gain medium and producing a monitoring result; a first light source configured to emit a first light beam to excite the cladding area; a second light source configured to emit a plurality of second light beams to excite each of the plurality of cores individually; and controlling means for making a decision as to whether each of the plurality of cores to transmit one of the plurality of optical channels based on the monitoring result, and controlling the first light source and the second light source based on the decision.

公开(公告)号：US20180052380A1

公开(公告)日：2018-02-22

申请号：US15561135

申请日：2016-03-22

Applicant: NEC Corporation

Inventor： Shigeru NAKAMURA

IPC: G02F1/313

CPC classification number: G02F1/3136 ,  G02B6/3542 ,  G02B6/3546 ,  G02B6/3596 ,  G02F1/225 ,  G02F1/3138 ,  G02F2001/311 ,  G02F2203/04 ,  H04Q11/00 ,  H04Q11/0005 ,  H04Q2011/0035 ,  H04Q2213/1301

Abstract: In an optical circuit using a Mach-Zehnder-type element, it is difficult to obtain an optical circuit which has a less wavelength dependence and is suitable for achieving high integration. Accordingly, an optical circuit according to the present invention includes: a first Mach-Zehnder-type element including a first branch waveguide, a first branching/combining unit connected to one end of the first branch waveguide, and a second branching/combining unit connected to another end of the first branch waveguide and having a branch configuration different from that of the first branching/combining unit; and a second Mach-Zehnder-type element including a second branch waveguide, a third branching/combining unit connected to one end of the second branch waveguide, and a fourth branching/combining unit connected to another end of the second branch waveguide and having a branch configuration different from that of the third branching/combining unit. The first branch waveguide and the second branch waveguide each include a phase difference adjustment means. In the second branching/combining unit and the third branching/combining unit, light coupling between two basic modes with a phase inverted and a higher-order mode, is smaller than that in the first branching/combining unit and the fourth branching/combining unit. The first Mach-Zehnder-type element and the second Mach-Zehnder-type element are connected with each other through the second branching/combining unit and the third branching/combining unit.

公开(公告)号：US20250045985A1

公开(公告)日：2025-02-06

申请号：US18926634

申请日：2024-10-25

Applicant: NEC Corporation

Inventor： Yoshimasa ONO ,  Shigeru NAKAMURA ,  Atsufumi SHIBAYAMA ,  Junichi ABE

IPC: G06T11/00 ,  G06F21/32 ,  G06T15/04 ,  G06T15/08 ,  G06V40/12 ,  G06V40/13

Abstract: Provided is a processing apparatus capable of obtaining a 2D image from 3D tomographic images, extracting an image for accurate authentication, and extracting an image at a high speed. A processing apparatus includes: means for calculating, from three-dimensional luminance data indicating an authentication target, depth dependence of striped pattern sharpness in a plurality of regions on a plane perpendicular to a depth direction of the target; means for calculating a depth at which the striped pattern sharpness is the greatest in the depth dependence of striped pattern sharpness; rough adjustment means for correcting the calculated depth on the basis of depths of other regions positioned respectively around the plurality of regions; fine adjustment means for selecting a depth closest to the corrected depth and at which the striped pattern sharpness is at an extreme; and means for extracting an image with a luminance on the basis of the selected depth.

公开(公告)号：US20240167807A1

公开(公告)日：2024-05-23

申请号：US17989687

申请日：2022-11-18

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 wavelength-tunable light source, and a first optical coupler configured to split an output of the wavelength-tunable light source into a reference light beam and a sample light beam. The SS-OCT apparatus includes a sample illumination section configured to illuminate a sample using the sample beam, and receive a backscattered sample light beam. The SS-OCT apparatus includes a second optical coupler configured to receive the reference light beam and the backscattered sample light beam, and output an optical interference signal. The SS-OCT apparatus includes a detector configured to convert the optical interference signal to an electrical interference signal. The SS-OCT apparatus includes a controller configured to receive the electrical interference signal, generate a sparse representation based on the received electrical signal using compressed sensing, and generate a depth profile of the sample based on the sparse representation.