公开(公告)号：US20200209417A1

公开(公告)日：2020-07-02

申请号：US16631770

申请日：2018-07-18

Applicant: Mark Andrew ENGLUND

Inventor： Mark Andrew ENGLUND

IPC: G01V1/22 ,  G01V3/08 ,  G01V1/38

Abstract: The present invention relates to a system for distributed acoustic sensing in a marine environment surrounding a repeater along a fibre-optic submarine communications cable. The system comprises at least one distributed acoustic sensing (DAS) unit. Each DAS unit further comprises a light source that is configured to transmit outgoing light in at least one fibre-optic sensing cable that is located in the marine environment and a receiver configured to receive reflected light that includes at least one optical property influenced by an acoustic disturbance in the marine environment. Each DAS unit further comprises an optical multiplexer for multiplexing optical signals onto the fibre-optic submarine communications cable via the repeater where the optical signals carry information on the at least influenced optical property. A method for distributed acoustic sensing in the marine environment is also disclosed.

公开(公告)号：US06940601B2

公开(公告)日：2005-09-06

申请号：US10239466

申请日：2001-03-23

Applicant: Mark Andrew Englund ,  Eric Carl Magi

Inventor： Mark Andrew Englund ,  Eric Carl Magi

IPC: G01M11/02 ,  G01M11/00 ,  G02B5/18 ,  G02B6/34 ,  H04B10/2519 ,  G01B9/02

CPC classification number: H04B10/2519 ,  G01M11/3172 ,  G02B6/29353 ,  G02B6/29392

Abstract: The present invention provides a method and apparatus for obtaining a measure of the chromatic dispersion of a fibre bragg grating, the method comprising: disposing the grating in a reflection arm of an interferometer; inputting probe laser light into the interferometer; stepping the wavelength of the light across the reflection bandwidth of the grating, while at each step modulating the wavelength by a wavelength modulation less than the size of the respective step, and thereby producing a resulting phase modulation; and demodulating the phase modulation and determining therefrom a measure of the chromatic dispersion.

Abstract translation: 本发明提供了一种用于获得光纤布拉格光栅色散测量的方法和装置，该方法包括：将光栅放置在干涉仪的反射臂中; 将探头激光输入干涉仪; 将光的波长跨过光栅的反射带宽，同时在每个步骤通过小于相应步长大小的波长调制来调制波长，从而产生相位调制; 并解调相位调制并由此确定色散的度量。

公开(公告)号：US11874417B2

公开(公告)日：2024-01-16

申请号：US16631770

申请日：2018-07-18

Applicant: Mark Andrew Englund

Inventor： Mark Andrew Englund

IPC: G01V1/38 ,  G01V3/08 ,  G01V1/22

CPC classification number: G01V1/226 ,  G01V1/38 ,  G01V3/08

Abstract: The present invention relates to a system for distributed acoustic sensing in a marine environment surrounding a repeater along a fibre-optic submarine communications cable. The system includes at least one distributed acoustic sensing (DAS) unit. Each DAS unit further includes a light source that is configured to transmit outgoing light in at least one fibre-optic sensing cable that is located in the marine environment and a receiver configured to receive reflected light that includes at least one optical property influenced by an acoustic disturbance in the marine environment. Each DAS unit further includes an optical multiplexer for multiplexing optical signals onto the fibre-optic submarine communications cable via the repeater where the optical signals carry information on the at least influenced optical property. A method for distributed acoustic sensing in the marine environment is also disclosed.

公开(公告)号：US10650648B2

公开(公告)日：2020-05-12

申请号：US16331918

申请日：2017-09-08

Applicant: Mark Andrew Englund

Inventor： Mark Andrew Englund

IPC: G08B13/18 ,  G08B13/186 ,  G01H9/00 ,  H04R23/00

Abstract: Described herein is a method and system of distributed acoustic sensing, such as in an urban or metropolitan area involving a dedicated and established fibre optic communications network including a data centre. In general, the disclosed method and system includes the steps of (a) selecting an optical fibre cable installation having a path extending across a selected geographical area, the optical fibre cable installation including a bundle of optical fibres and forming part of a fibre-optic communications network, (b) determining characteristics associated with the optical fibre and/or the selected optical fibre installation, (c) transmitting outgoing light in the optical fibre, (d) receiving reflected light back scattered along the optical fibre, and (e) based on the reflected light and the determined characteristics, generating an alert signal representative of an acoustic event. The disclosed method and system is thereby configured to detect acoustic events near or within the selected geographical area.

公开(公告)号：US20190197846A1

公开(公告)日：2019-06-27

申请号：US16331918

申请日：2017-09-08

Applicant: Mark Andrew ENGLUND

Inventor： Mark Andrew ENGLUND

IPC: G08B13/186 ,  G01H9/00 ,  H04R23/00

CPC classification number: G08B13/186 ,  G01H9/004 ,  H04R23/008

Abstract: Described herein is a method and system of distributed acoustic sensing, such as in an urban or metropolitan area involving a dedicated and established fibre optic communications network including a data centre. In general, the disclosed method and system includes the steps of (a) selecting an optical fibre cable installation having a path extending across a selected geographical area, the optical fibre cable installation including a bundle of optical fibres and forming part of a fibre-optic communications network, (b) determining characteristics associated with the optical fibre and/or the selected optical fibre installation, (c) transmitting outgoing light in the optical fibre, (d) receiving reflected light back scattered along the optical fibre, and (e) based on the reflected light and the determined characteristics, generating an alert signal representative of an acoustic event. The disclosed method and system may be useful in the detection of acoustic events near or within the selected geographical area.

公开(公告)号：US07024092B2

公开(公告)日：2006-04-04

申请号：US10432068

申请日：2001-12-07

Applicant: Mark Andrew Englund ,  Sigurd Weidemann Loevseth

Inventor： Mark Andrew Englund ,  Sigurd Weidemann Loevseth

IPC: G02B6/00

CPC classification number: H01S3/06716 ,  G02B6/021 ,  G02B6/02185 ,  G02B6/2552 ,  G02B2006/1218 ,  H01S3/06729

Abstract: The present invention is to a method of adapting optical rare-earth-doped waveguide (10) having a plurality of transverse propagation modes, such that in use, signal gains of non-fundamental modes of the waveguide are attenuated relative to a signal gain of a fundamental mode of the waveguide. The waveguide (10) has a light-guiding region (45) defined by a refractive index-modifying dopant, such as Ge, which has a thermal diffusion coefficient at temperature T in the waveguide greater than a thermal diffusion coefficient of the rare-earth dopant at temperature T. The method comprises heating the waveguide (10) at the temperature T such that a concentration profile of the refractive index-modifying dopant becomes broader than a concentration profile of the rare-earth dopant.

Abstract translation: 本发明是一种适应具有多个横向传播模式的光学稀土掺杂波导（10）的方法，使得在使用中波导的非基本模​​式的信号增益相对于 波导的基本模式。 波导（10）具有由诸如Ge的折射率改性掺杂剂限定的导光区域（45），其在波导中的温度T处的热扩散系数大于稀土的热扩散系数 掺杂剂。该方法包括在温度T下加热波导（10），使得折射率修饰掺杂剂的浓度分布比稀土掺杂剂的浓度分布宽。