公开(公告)号：US12092860B2

公开(公告)日：2024-09-17

申请号：US18496171

申请日：2023-10-27

Applicant: CIENA CORPORATION

Inventor： Michael Y. Frankel ,  John Israel ,  James Westdorp

IPC: H04B10/08 ,  G02B6/02 ,  G02B6/032 ,  G08B13/186 ,  H04B10/071 ,  H04L9/40

CPC classification number: G02B6/02304 ,  G02B6/02328 ,  G02B6/032 ,  G08B13/186 ,  H04B10/071 ,  H04L63/162

Abstract: A hollow core fiber (HCF) link is characterized by structural properties selected to support and sustain light propagation in a fundamental mode and in at least one higher-order mode. Connected to a proximal end of the HCF link, there is a mode coupler configured to couple a data signal into the fundamental mode and to couple an obfuscating signal into the at least one higher-order mode for simultaneous propagation of the data signal and the obfuscating signal on the HCF link, where the obfuscating signal substantially overlaps the data signal in spectral content. At a distal end of the HCF link, there is a mode splitter configured to split a first optical signal detected in the fundamental mode from a second optical signal detected in the at least one higher-order mode.

公开(公告)号：US20230386308A1

公开(公告)日：2023-11-30

申请号：US18362664

申请日：2023-07-31

Applicant: CyberSecure IPS, LLC

Inventor： Cary R. MURPHY ,  David E. VOKEY ,  Mark K. BRIDGES

IPC: G08B13/186 ,  G02B6/44 ,  H04B10/071

CPC classification number: G08B13/186 ,  G02B6/4469 ,  H04B10/071

Abstract: In some embodiments, optical fiber monitoring may be facilitated. In some embodiments, monitoring of an optical fiber may be performed via a detection system to detect changes in the optical fiber that are indicative of one or more events. During the monitoring, a monitor signal may be transmitted along the optical fiber via a light source, where the monitor signal is received by the detection system as light from the optical fiber. While the detection system continues to receive light from the optical fiber in connection with the transmitting of the monitor signal, a test disturbance event may be caused to occur at a predetermined location along the optical fiber via a device at the predetermined location. In response to a failure of the detection system to detect test-related changes in the optical fiber caused by the test disturbance event, a notification indicating an issue may be generated.

公开(公告)号：US11151853B2

公开(公告)日：2021-10-19

申请号：US16349181

申请日：2017-11-09

Applicant: Carrier Corporation

Inventor： Michael J. Birnkrant ,  Jennifer M. Alexander ,  Alan Matthew Finn ,  Yanzhi Chen ,  Jie Xi ,  Peter R. Harris

IPC: G08B17/107 ,  G08B13/12 ,  G08B13/186 ,  G08B17/06 ,  G08B17/113 ,  G08B29/18 ,  G08B13/187

Abstract: A detection system for measuring one or more condition within a predetermined area includes a fiber harness having at least one fiber optic cable for transmitting light. The at least one fiber optic cable defines a node arranged to measure the one or more conditions. A light source is coupled to the at least one fiber optic cable for emitting a modulated light to the node. The modulated light is transmitted into the predetermined area. A light sensitive device is coupled to the at least one fiber optic cable for receiving scattered light associated with the node. A control unit is operably coupled to the light source and to the light sensitive device to determine at least one of a presence and magnitude of the one or more conditions within the predetermined area.

公开(公告)号：US20210287502A1

公开(公告)日：2021-09-16

申请号：US17127118

申请日：2020-12-18

Applicant: SATELLITE TRACKING OF PEOPLE LLC

Inventor： Stephen FREATHY

IPC: G08B13/186 ,  G08B21/22

Abstract: A clip is provided. The clip includes first and second shells shaped to mate around a band. An inward facing surface of the first shell has a lateral groove shaped to accommodate the fiber optic filament of the band and at least one protrusion. When the first and second shells are mated around the band the at least one protrusion passes through one of the holes in the band and engages a matching groove in an inward facing surface of the second shell. The first and second shells have a shape such that, when the first shell and the second shell mate around the band and lock into the connector, the first shell and the second shell collectively block any exterior light from reaching the light detection circuitry of the connector along the path of the band other than light through the fiber optic filament.

公开(公告)号：US11107339B2

公开(公告)日：2021-08-31

申请号：US16349535

申请日：2017-11-08

Applicant: Carrier Corporation

Inventor： Marcin Piech ,  Michael J. Birnkrant

IPC: G08B17/107 ,  G08B13/186 ,  H04B10/116 ,  G08B13/187 ,  G08B17/06 ,  G08B17/113 ,  G08B25/01 ,  G08B29/18

Abstract: An integrated communication and smoke detection system includes a fiber harness having at least one fiber optic cable for transmitting light, the at least one fiber optic cable defining a node arranged to measure one or more conditions at a predetermined area. A light source is operably connected to the fiber harness to transmit light along the at least one fiber optic cable to the node. A control system operably coupled to the fiber harness such that scattered light associated with the node is transmitted to the control system, wherein the control system analyzes the scattered light to determine at least one of a presence and magnitude of the one or more conditions at the node. The control system is configured to allow multiple inputs and outputs for communication of information through the fiber harness and node using modulated light.

公开(公告)号：US10957176B2

公开(公告)日：2021-03-23

申请号：US16349182

申请日：2017-11-09

Applicant: Carrier Corporation

Inventor： Michael J. Birnkrant ,  Jennifer M. Alexander ,  Yanzhi Chen ,  Peter R. Harris ,  Jie Xi ,  Alan Matthew Finn ,  Hui Fang

IPC: G08B17/107 ,  G08B13/186 ,  G08B13/187 ,  G08B17/06 ,  G08B29/18

Abstract: A detection system for measuring one or more conditions within a predetermined area includes a fiber harness having at least one fiber optic cable for transmitting light. The at least one fiber optic cable defines a node arranged to measure the one or more conditions. A control system is operably coupled to the fiber harness such that a signal indicative of scattered light associated with the node is transmitted to the control system. The control system analyzes the signal associated with the node in one or more of a frequency domain, time-frequency domain, time domain, and spatial domain, to determine at least one of a presence and magnitude of the condition within the predetermined area.

公开(公告)号：US10909822B2

公开(公告)日：2021-02-02

申请号：US16805610

申请日：2020-02-28

Applicant: Fiber Sense Pty Ltd

Inventor： Mark A. Englund

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

Abstract: Described herein are methods and systems 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 are thereby configured to detect acoustic events near or within the selected geographical area.

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：US20200035074A1

公开(公告)日：2020-01-30

申请号：US16542399

申请日：2019-08-16

Applicant: Network Integrity Systems, Inc.

Inventor： Cary R. Murphy ,  Mark K. Bridges ,  David Thompson ,  Joseph Giovannini ,  David E. Vokey

IPC: G08B13/186

Abstract: A method is provided for detecting intrusion into an optical cable of a single mode optical fiber network comprising where monitoring light signals are transmitted along a telecommunications optical fiber to be monitored either along a fiber additional to a data fiber or by multiplexing onto a common fiber. The received monitoring light signals after transmission along the telecommunications optical fiber are analyzed for changes indicative of movement of the optical fiber for detecting an intrusion event. The monitoring light signals at the receive end of the fiber signals are monitored by feeding the signals from the single mode fiber into a multi-mode fiber in a manner which causes changes in modal power distribution which can be detected by taking a portion only of the modes.

公开(公告)号：US10365126B2

公开(公告)日：2019-07-30

申请号：US15567076

申请日：2016-10-27

Applicant: Tianjin University

Inventor： Kun Liu ,  Tiegen Liu ,  Junfeng Jiang ,  Chunyu Ma ,  Tianjiao Chai ,  Chang He ,  Miao Tian ,  Zhichen Li

IPC: G01D5/353 ,  G08B13/186 ,  G01H9/00

Abstract: A distributed optical fiber disturbance positioning system based on the asymmetric dual Mach-Zehnder interference, unlike traditional dual Mach-Zehnder distributed optical fiber disturbance sensing system, the present invention adopts two narrow-bandwidth optical sources (1a, 1b) and adopts corresponding DWDM (3a, 3b) before the detector (4a, 4b) to filter the backscatter noise of the optical fiber, and can solve the problems of having too low SNR due to backscatter influence when the sensing distance is long. The present invention also provides a positioning method for applying the system, which obtains the TFD of the disturbance frame signals by using the time-frequency analysis method based on the short-term average frequency, and takes the points near the point of maximum frequency as the effective signal segment for performing cross-correlation time delay estimation, thus obtaining the delay, and the disturbance position. The method of the invention positions the asymmetric disturbance frame signals in the systems, thus having a high positioning accuracy and reliability.