JP2023530232A - 導波音響波型ブリルアン散乱からの光ファイバにおけるモードフィールド分布の推定 - Google Patents
導波音響波型ブリルアン散乱からの光ファイバにおけるモードフィールド分布の推定 Download PDFInfo
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- 238000009826 distribution Methods 0.000 title claims abstract description 78
- 239000013307 optical fiber Substances 0.000 title claims abstract description 25
- 230000003287 optical effect Effects 0.000 claims abstract description 46
- 238000005259 measurement Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000012360 testing method Methods 0.000 claims abstract description 6
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- 230000010287 polarization Effects 0.000 claims description 21
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
- G01M11/331—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face by using interferometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/073—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an out-of-service signal
- H04B10/0731—Testing or characterisation of optical devices, e.g. amplifiers
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- Signal Processing (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
Claims (8)
- 導波音響波型ブリルアン散乱から光ファイバのモードフィールド分布を推定する方法であって、
被測定光ファイバ(FUT)によって示される導波音響波型ブリルアン散乱を決定するために、導波音響波型ブリルアン散乱(GAWBS)の正確な測定を提供する装置であって、
局部発振器入力ポートと信号ポートとを有するコヒーレント光受信器と、
前記コヒーレント受信器のLOポートと光通信する偏波保持(PM)光ファイバの区間と、
前記コヒーレント受信器の信号ポートと光通信する被測定光ファイバ(FUT)の区間と、
前記PM光ファイバおよび前記FUTと光通信する連続波(CW)レーザと、
前記FUTと光通信する較正レーザ(laser-cal)と、を有し、
光が前記laser-calから出力され、光が前記CWレーザから出力され、
前記CWレーザから出力された前記光は2つのビームに分割され、一方のビームは前記PM光ファイバに向けられ、他方のビームは前記FUTに向けられ、
前記laser-calから出力された前記光は前記FUTに向けられた前記CWレーザのビームと結合され、
前記コヒーレント受信器が、そのLOポートで前記CWレーザからの光を受信し、その信号ポートで前記結合されたlaser-cal出力光およびCW光を受信し、
前記LOポートで受信した光と前記信号ポートで受信した結合光とは複数の光検出器によって検出され、その後、それから生じる光検出器出力信号がそれぞれのバンドパスフィルタによってフィルタリングされ、
前記フィルタリングされた出力信号が、アナログデジタル変換器(ADC)の作用によってデジタル化され、
前記GAWBSの出力スペクトルが、前記ADCのデジタル化された出力信号から決定されるように構成されている装置を動作させる工程と、
前記GAWBSのスペクトルから前記GAWBSからの前記光モードフィールド分布を推定する工程と、を含む方法。 - 前記光モードフィールド分布が決定される前記光は、常に前記FUT内に留まる光である、請求項1に記載の方法。
- 推定された前記光モードフィールド分布は、前記FUTの長さに沿ったモードフィールド分布の平均である、請求項2に記載の方法。
- 両方の偏波における前記GAWBSのスペクトルを測定および決定することをさらに含む、請求項3に記載の方法。
- ROmモードから前記GAWBSのスペクトル中のGAWBSピークを分離することをさらに含む、請求項4に記載の方法。
- 前記ROmモードの歪み関数を決定することをさらに含む、請求項5に記載の方法。
- 逆変換からモードフィールドの2乗値を決定することをさらに含む、請求項6に記載の方法。
- 前記モードフィールドの2乗から前記モードフィールドを推定することをさらに含む、請求項7に記載の方法。
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US202063035959P | 2020-06-08 | 2020-06-08 | |
US63/035,959 | 2020-06-08 | ||
US202163141068P | 2021-01-25 | 2021-01-25 | |
US63/141,068 | 2021-01-25 | ||
US17/341,033 US11467061B2 (en) | 2020-06-08 | 2021-06-07 | Estimating mode field distribution in optical fibers from guided acoustic wave brillouin scattering |
US17/341,033 | 2021-06-07 | ||
PCT/US2021/036429 WO2021252508A1 (en) | 2020-06-08 | 2021-06-08 | Estimating mode field distribution in optical fibers from guided acoustic-wave brillouin scattering |
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JP (1) | JP7412605B2 (ja) |
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WO (1) | WO2021252508A1 (ja) |
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EP3627112A1 (en) * | 2018-09-20 | 2020-03-25 | Koninklijke Philips N.V. | Optical fiber sensor |
US11467061B2 (en) * | 2020-06-08 | 2022-10-11 | Nec Corporation | Estimating mode field distribution in optical fibers from guided acoustic wave brillouin scattering |
US11736867B2 (en) * | 2021-01-20 | 2023-08-22 | Nec Corporation | Active microphone for increased DAS acoustic sensing capability |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2000002290A1 (en) * | 1998-07-03 | 2000-01-13 | University Of Southampton | Optical fibre and optical fibre device |
US20080205839A1 (en) * | 2007-02-28 | 2008-08-28 | Scott Robertson Bickham | Large effective area high SBS threshold optical fiber |
JP2015230165A (ja) * | 2014-06-03 | 2015-12-21 | 日本電信電話株式会社 | モード間パワー比測定方法、パワー比測定装置及びモード間パワー比測定システム |
US20200149878A1 (en) * | 2017-04-20 | 2020-05-14 | Bar-Ilan University | Distributed fiber optic sensing using guided acoustic modes |
US11467061B2 (en) * | 2020-06-08 | 2022-10-11 | Nec Corporation | Estimating mode field distribution in optical fibers from guided acoustic wave brillouin scattering |
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US8493555B2 (en) * | 2011-04-29 | 2013-07-23 | Corning Incorporated | Distributed Brillouin sensing systems and methods using few-mode sensing optical fiber |
JP7287008B2 (ja) * | 2019-03-04 | 2023-06-06 | 日本電信電話株式会社 | 音響モード伝搬速度測定方法及び音響モード伝搬速度測定装置 |
US20220173808A1 (en) * | 2020-12-02 | 2022-06-02 | Nec Laboratories America, Inc | Optical fiber exhibiting low guided acoustic brillouin scattering (gawbs) noise and measurement thereof |
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- 2021-06-07 US US17/341,033 patent/US11467061B2/en active Active
- 2021-06-08 WO PCT/US2021/036429 patent/WO2021252508A1/en active Application Filing
- 2021-06-08 JP JP2022574842A patent/JP7412605B2/ja active Active
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000002290A1 (en) * | 1998-07-03 | 2000-01-13 | University Of Southampton | Optical fibre and optical fibre device |
US20080205839A1 (en) * | 2007-02-28 | 2008-08-28 | Scott Robertson Bickham | Large effective area high SBS threshold optical fiber |
JP2015230165A (ja) * | 2014-06-03 | 2015-12-21 | 日本電信電話株式会社 | モード間パワー比測定方法、パワー比測定装置及びモード間パワー比測定システム |
US20200149878A1 (en) * | 2017-04-20 | 2020-05-14 | Bar-Ilan University | Distributed fiber optic sensing using guided acoustic modes |
US11467061B2 (en) * | 2020-06-08 | 2022-10-11 | Nec Corporation | Estimating mode field distribution in optical fibers from guided acoustic wave brillouin scattering |
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WO2021252508A1 (en) | 2021-12-16 |
US11467061B2 (en) | 2022-10-11 |
DE112021003171T5 (de) | 2023-06-01 |
US20220011195A1 (en) | 2022-01-13 |
JP7412605B2 (ja) | 2024-01-12 |
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