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1.发明公开公开(公告)号：US20230412297A1
公开(公告)日：2023-12-21
申请号：US18031208
申请日：2020-10-26
Applicant: NEC Corporation
Inventor： Keiichi MATSUMOTO , Hitoshi Takeshita , Hidemi Noguchi , Emmanuel Le Taillandier de Gabory
CPC classification number: H04J14/02216 , H01S3/06754 , H04J14/0212
Abstract: An optical amplifier that amplifies an incident WDM signal and includes cores having an amplification medium, the optical amplifier includes: a wavelength demultiplexer configured to demultiplex the incident WDM signal into wavelength bands and introducing the demultiplexed WDM signals into the cores separately; a wavelength multiplexer configured to multiplex amplified optical signals propagated through the cores and outputting the multiplexed signal; and an wavelength demultiplexing controller configured to monitor an amplification rate of a specific wavelength band of an amplified WDM signal or a scale associated with an amplification rate of a specific wavelength band, demultiplexing, from the incident WDM signal, an optical signal of a wavelength band having relatively-small optical amplification efficiency according to a monitoring result, and controlling demultiplexing performed by the wavelength demultiplexer in such a way as to amplify, with a relatively-large amplification rate, the optical signal of the wavelength band having relatively-small optical amplification efficiency.
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2.发明公开公开(公告)号：US20240097397A1
公开(公告)日：2024-03-21
申请号：US18520605
申请日：2023-11-28
Applicant: NEC Corporation
Inventor： Hitoshi TAKESHITA , Keiichi MATSUMOTO , Shigeyuki YANAGIMACHI
IPC: H01S3/067 , G02B6/02 , H01S3/13 , H04B10/291
CPC classification number: H01S3/06754 , G02B6/02042 , H01S3/13013 , H04B10/2912
Abstract: It is difficult to construct an optical fiber transmission system enabling relay optical amplification using a coupled multi-core optical fiber as an optical transmission path; therefore, an optical amplification device includes first optical spatial layout converting means for converting a spatial layout of a plurality of optical signal beams propagating through each of a plurality of cores, from a coupled state in which optical signal beams interfere between a plurality of cores to a non-coupled state in which optical signal beam interference is reduced between a plurality of cores; optical amplifying means for amplifying, in the non-coupled state, the plurality of optical signal beams with the non-coupled state and generating a plurality of amplified optical signal beams; and second optical spatial layout converting means for converting a spatial layout of the plurality of amplified optical signal beams from the non-coupled state to the coupled state.
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公开(公告)号：US20220376811A1
公开(公告)日：2022-11-24
申请号：US17743695
申请日：2022-05-13
Applicant: NEC Corporation
Inventor： Keiichi MATSUMOTO , Kohei HOSOKAWA
IPC: H04J14/02 , H04B10/294
Abstract: A light amplification device according to an example aspect of the invention includes a wavelength demultiplexing unit configured to demultiplex the wavelength division multiplexed signal light into a plurality of wavelength bands; a plurality of light amplification media configured to amplify the plurality of pieces of demultiplexed multiplex signal light; a wavelength multiplexing unit configured to multiplex the amplified demultiplexed multiplex signal light; a plurality of excitation energy supply units configured to supply excitation energy to each of the plurality of light amplification media; and a control unit, wherein the control unit includes a wavelength multiplexing/demultiplexing control unit configured to control the wavelength demultiplexing unit and the wavelength multiplexing unit in such a way that a starting wavelength and a wavelength number become an optimum starting wavelength and an optimum wavelength number when a sum of power consumption of the plurality of excitation energy supply units is minimized.
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公开(公告)号：US20210399514A1
公开(公告)日：2021-12-23
申请号：US17281329
申请日：2019-09-27
Applicant: NEC Corporation
Abstract: An optical amplification apparatus includes an optical amplification medium, having a gain in a wavelength band of signal light, configured to receive the signal light; excitation light introduction means for introducing, into the optical amplification medium, excitation light to excite the optical amplification medium; and residual excitation light introduction means for introducing, into the optical amplification medium, residual excitation light output from the optical amplification medium, the residual excitation light having a wavelength component of the excitation light, wherein the residual excitation light introduction means includes, on a side of one end of the optical amplification medium, residual excitation light multiplexing means for multiplexing the signal light and the residual excitation light, and on a side of another end of the optical amplification medium, space propagation type wavelength demultiplexing means for wavelength-demultiplexing the signal light and the residual excitation light by means of a spatial optical system.
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公开(公告)号：US20210044077A1
公开(公告)日：2021-02-11
申请号：US16978460
申请日：2018-03-07
Applicant: NEC Corporation
Inventor： Emmanuel LE TAILLANDIER DE GABORY , Keiichi MATSUMOTO
IPC: H01S3/13 , H04J14/02 , H04B10/25 , H04B10/572 , H04B10/66 , H01S3/067 , H01S3/094 , H01S3/10 , H01S3/23
Abstract: It is difficult to flatten the gain profile of an optical amplifier without increasing the power consumption, the cost, and the size of the optical amplifier; therefore, a monitoring apparatus for optical amplifier according to an exemplary aspect of the invention includes an optical filtering means for receiving a monitor light beam of the optical amplifier and transmitting a filtered monitor light beam with a set range of wavelength band; a photoelectric conversion means for converting the filtered monitor light beam into a monitoring signal; and a spectrum information generating means for generating spectrum information based on the monitoring signal, the spectrum information including information on a spectrum profile of output of the optical amplifier.
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Patent Agency Ranking
公开(公告)号：US20210028590A1
公开(公告)日：2021-01-28
申请号：US17043569
申请日：2018-04-11
Applicant: NEC Corporation
Inventor： Emmanuel LE TAILLANDIER DE GABORY , Keiichi MATSUMOTO
IPC: H01S3/067 , H01S3/30 , H01S3/094 , H01S3/23 , H01S3/16 , H04B10/2581 , H04J14/02 , H04B10/291 , H04J14/04
Abstract: An object is to provide an optical amplifier capable of performing Raman amplification while suppressing power consumption and a size. A multicore fiber has a double clad structure. The double clad structure includes a plurality of cores thorough which an optical signal is transmitted and a clad includes the cores. A light source outputs a pump light used for amplifying the optical signal by stimulated Raman scattering in the multicore fiber. The pump light is generated by multiplexing multimode laser lights. A optical coupler couples the pump light into the clad of the multicore fiber.
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公开(公告)号：US20230026901A1
公开(公告)日：2023-01-26
申请号：US17797843
申请日：2021-02-15
Applicant: NEC Corporation
Inventor： Keiichi MATSUMOTO , Hidemi NOGUCHI , Emmanuel LE TAILLANDIER DE GABORY
IPC: G01K11/3206 , G02B6/02
Abstract: Provided are a monitoring device, a monitoring method, and an optical transmission system which are adapted for an increase in the number of cores of a multi-core optical fiber transmission path and suitable for crosstalk monitoring. The monitoring device monitors a multi-core optical fiber transmission path having a plurality of use cores and at least one or more non-use cores, and comprises: an applying means for applying, at a start point of the multi-core optical fiber transmission path, dithering to signal light propagating in the use cores; a monitoring means for monitoring the power of the non-use cores at an input side of a relay in the multi-core optical fiber transmission path; and a separating means for separating a monitoring result from the monitoring means into power components from the plurality of use cores.
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公开(公告)号：US20220385026A1
公开(公告)日：2022-12-01
申请号：US17765505
申请日：2019-10-07
Applicant: NEC Corporation
Inventor： Hitoshi TAKESHITA , Keiichi MATSUMOTO , Hidemi NOGUCHI
Abstract: Light amplification devices using coupled multi-core optical fibers have a figure of merit that temporally varies, which makes it difficult to perform performance evaluation and to build a light transmission system using the same. Accordingly, a light amplification device of the present invention comprises: a band control means that controls the wavelength band of a light carrier to generate a band control light; and a band control light amplification means that has a plurality of light amplification media through which the band control light propagates, wherein the band control light amplification means amplifies the band control light in a coupled state in which the light propagating through the plurality of light amplification media induces a crosstalk and wherein the band control means controls the wavelength band such that the band control light having propagated through the plurality of light amplification media has a reduced coherence.
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公开(公告)号：US20210057869A1
公开(公告)日：2021-02-25
申请号：US17044088
申请日：2019-04-08
Applicant: NEC Corporation
Abstract: In optical amplifiers that use a multicore optical fiber, the absorption efficiency of excitation light in an optical amplification medium is low and the amplification efficiency of light intensity becomes lower in the cladding excitation method; therefore, an optical amplification apparatus according to the present invention includes an optical amplification medium, having a gain in a wavelength band of signal light, configured to receive the signal light; excitation light introduction means for introducing, into the optical amplification medium, excitation light to excite the optical amplification medium; and residual excitation light introduction means for introducing, into the optical amplification medium, residual excitation light output from the optical amplification medium, the residual excitation light having a wavelength component of the excitation light.
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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
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.
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