JP2021512289A - Aomゲート再循環ループと周波数シフト受信機loを用いた高速周波数ホッピングdasインタロゲーション - Google Patents
Aomゲート再循環ループと周波数シフト受信機loを用いた高速周波数ホッピングdasインタロゲーション Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7143—Arrangements for generation of hop patterns
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
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- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
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Abstract
Description
本出願は、2018年1月26日出願の米国仮特許出願第62/622,191号及び米国実用新案出願第16/258,586号の優先権を主張するものであり、それらの全内容は、本書で詳細に記載されているかのように参照により組み込まれている。
Claims (10)
- 改良型光ファイバ分散型音響センシング(DAS)アセンブリであって、該システムは光ファイバと、前記光ファイバと光通信する光送受信アセンブリとを備え:
ゲート音響光学変調器(AOM)を含む再循環光ファイバループであって、前記再循環光ファイバループが前記光ファイバに接続されていることを特徴とするDASアセンブリ。 - 前記再循環光ファイバループは、周波数ホッピング光パルスを生成するように構成されることを特徴とする、請求項1に記載のDASアセンブリ。
- 前記循環光ファイバループは、光パルスが前記ループを再循環する回数によって決定される複数の光周波数を生成するように構成されることを特徴とする、請求項2に記載のDASアセンブリ。
- 前記周波数ホッピング光パルスは、前記DASの実効音響サンプリングレートを増加させることを特徴とする、請求項3に記載のDASシステム。
- 単一周波数を示すシード光パルスが異なる周波数で複数のトレーリングパルスを生成することを特徴とする、請求項4に記載のDASシステム。
- 前記AOMに印加される電気駆動信号の無線(RF)周波数が、前記周波数ホップの各々に周波数間隔を設定することを特徴とする、請求項2に記載のDASシステム。
- 前記再循環ループは、隣接するパルススタガリング時間を設定するように構成された光ファイバ遅延長を含む、請求項6に記載のDASシステム。
- 前記再循環ループは、前記周波数ホッピングパルスの難問を等化するように構成されたエルビウム添加ファイバ増幅器(EDFA)を含むことを特徴とする、請求項7に記載のDASシステム。
- 受信機帯域幅が減少するように、DAS信号をコヒーレントに検出するための周波数シフト局部発振器(LO)によって特徴付けられる、請求項8に記載のDASシステム。
- 前記LO周波数オフセットが、I/Q不均衡からの干渉が排除されるように構成されることを特徴とする、請求項9に記載のDASシステム。
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201862622191P | 2018-01-26 | 2018-01-26 | |
US62/622,191 | 2018-01-26 | ||
US16/258,586 | 2019-01-26 | ||
US16/258,586 US11159200B2 (en) | 2018-01-26 | 2019-01-26 | High speed frequency hopping DAS interrogation using AOM-gated re-circulating loop and frequency-shifted receiver LO |
PCT/US2019/015322 WO2019148061A1 (en) | 2018-01-26 | 2019-01-28 | High speed frequency hopping das interrogation using aom-gated re-circulating loop and frequency-shifted receiver lo |
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JP2021512289A true JP2021512289A (ja) | 2021-05-13 |
JP7086200B2 JP7086200B2 (ja) | 2022-06-17 |
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US (1) | US11159200B2 (ja) |
JP (1) | JP7086200B2 (ja) |
DE (1) | DE112019000536T5 (ja) |
WO (1) | WO2019148061A1 (ja) |
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CN110595553B (zh) * | 2019-09-18 | 2020-11-24 | 华中农业大学 | Led可见光面大中籽粒作物排种检测装置 |
EP4047333A4 (en) * | 2019-10-17 | 2023-06-21 | Nippon Telegraph And Telephone Corporation | OPTICAL PULSE TEST METHOD AND DEVICE |
WO2021220203A1 (en) * | 2020-04-28 | 2021-11-04 | Fiber Sense Pty Ltd | Integrated coherent receiver for distributed fiber sensing apparatus |
US20220146304A1 (en) * | 2020-11-10 | 2022-05-12 | Nec Laboratories America, Inc | Reduced complexity polarization combining method for coherent das |
JP2024014807A (ja) * | 2022-07-21 | 2024-02-01 | サブコム,エルエルシー | 分散型音響センシングを改良するためのマルチスパン光ファイバシステムおよび技術 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040170439A1 (en) * | 2001-06-29 | 2004-09-02 | Olli-Pekka Hiironen | Method and apparatus for an optical cdma system |
US20130113629A1 (en) * | 2011-11-04 | 2013-05-09 | Schlumberger Technology Corporation | Phase sensitive coherent otdr with multi-frequency interrogation |
US20170346551A1 (en) * | 2006-10-13 | 2017-11-30 | At&T Intellectual Property Ii, L.P. | Method and apparatus for acoustic sensing using multiple optical pulses |
US20170350734A1 (en) * | 2016-06-02 | 2017-12-07 | Nec Laboratories America, Inc. | Distributed Acoustic Sensing System Based on Delayed Optical Hybrid Phase Demodulator |
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US7268863B2 (en) * | 2004-08-06 | 2007-09-11 | The United States Of America As Represented By The Secretary Of The Navy | Natural fiber span reflectometer providing a spread spectrum virtual sensing array capability |
GB0424305D0 (en) * | 2004-11-03 | 2004-12-01 | Polarmetrix Ltd | Phase-disturbance location and measurement in optical-fibre interferometric reflectometry |
US7630641B1 (en) * | 2006-08-02 | 2009-12-08 | Lockheed Martin Corporation | Optical network monitoring |
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- 2019-01-26 US US16/258,586 patent/US11159200B2/en active Active
- 2019-01-28 JP JP2020540302A patent/JP7086200B2/ja active Active
- 2019-01-28 DE DE112019000536.7T patent/DE112019000536T5/de active Pending
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040170439A1 (en) * | 2001-06-29 | 2004-09-02 | Olli-Pekka Hiironen | Method and apparatus for an optical cdma system |
US20170346551A1 (en) * | 2006-10-13 | 2017-11-30 | At&T Intellectual Property Ii, L.P. | Method and apparatus for acoustic sensing using multiple optical pulses |
US20130113629A1 (en) * | 2011-11-04 | 2013-05-09 | Schlumberger Technology Corporation | Phase sensitive coherent otdr with multi-frequency interrogation |
US20170350734A1 (en) * | 2016-06-02 | 2017-12-07 | Nec Laboratories America, Inc. | Distributed Acoustic Sensing System Based on Delayed Optical Hybrid Phase Demodulator |
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US20190238178A1 (en) | 2019-08-01 |
JP7086200B2 (ja) | 2022-06-17 |
WO2019148061A1 (en) | 2019-08-01 |
DE112019000536T5 (de) | 2021-02-18 |
US11159200B2 (en) | 2021-10-26 |
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