公开(公告)号：US20230130788A1

公开(公告)日：2023-04-27

申请号：US17958415

申请日：2022-10-02

申请人： NEC Laboratories America, Inc.

发明人： Sarper OZHARAR ,  Ting WANG ,  Yue TIAN ,  Yangmin DING ,  Philip JI ,  Shaobo Han ,  Ming-Fang Huang ,  Tingfeng Li

IPC分类号： G01H9/00 ,  G01D5/353 ,  H04B10/071

摘要： Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously sense/monitor outdoor facilities and structures including outdoor cabinets containing fiber optic facilities in which the cabinet/fiber optic cable contained therein are configured to provide superior acoustic sensing. Further outdoor facilities and structures that are monitored include manhole structures. Superior DFOS/DAS monitoring results are obtained by employing a machine learning-based analysis method that employs a temporal relation network (TRN).

公开(公告)号：US11632172B2

公开(公告)日：2023-04-18

申请号：US17470458

申请日：2021-09-09

申请人： ANRITSU CORPORATION

发明人： Ryota Takasu ,  Taichi Murakami

IPC分类号： H04B10/07 ,  H04B10/071 ,  H04Q11/00

摘要： It is possible to allow a user to easily distinguish between an event at a place to be resolved and an event at a place having no problem on a path of a PON communication network to be measured. A light intensity distribution of return light is processed in a time-series order to detect an event at each position on a network. A parameter N1 relating to the total number of splitters present on a path of the network is specified, the number N2 of detections of the total number of splitters detected as an event is recognized, and in a case where “N1>N2”, a last detected event is associated with one optical splitter and is further displayed as an “uncertain splitter” in distinction from a normal splitter.

公开(公告)号：US20230069526A1

公开(公告)日：2023-03-02

申请号：US17966235

申请日：2022-10-14

申请人： Network Integrity Systems, Inc.

发明人： Cary R. Murphy ,  David E. Vokey ,  Mark K. Bridges

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

摘要： In an optical fiber monitoring system which detects physical disturbance or other parameters such as temperature or strain of a fiber where a monitor signal is transmitted along the optical fiber and analyzed to detect changes which are indicative of an event, a method is provided for periodically checking proper operation of the optical fiber monitoring system. A fiber disturbance actuator periodically causes a pattern of disturbances of a portion of the fiber at a predetermined location thereon where the disturbance is characteristic of the event to be monitored. The monitor signal is analyzed to detect the pattern of changes and in the event that expected changes are not detected, a warning is issued that the intrusion detection system is not properly operating.

公开(公告)号：US11573152B2

公开(公告)日：2023-02-07

申请号：US16581920

申请日：2019-09-25

申请人： Cisco Technology, Inc.

发明人： Pietro Invernizzi ,  Enrico Sozio

IPC分类号： G01M11/00 ,  G06K9/62 ,  G06N3/08 ,  H04B10/07 ,  H04B10/071

摘要： In one embodiment, a device receives optical time domain reflectometer (OTDR) trace samples, each sample labeled with an associated fiber optic cable condition. The device alters the received OTDR trace samples to generate a set of synthetic OTDR trace samples. Each synthetic sample is labeled with the label of the received sample that was altered to generate the synthetic sample. The device trains a machine learning-based classifier using a training dataset that comprises the synthetic OTDR trace samples. The device uses the trained classifier to identify a condition along a particular fiber optic cable based on OTDR trace data obtained from that cable.

公开(公告)号：US11533106B2

公开(公告)日：2022-12-20

申请号：US17663652

申请日：2022-05-16

申请人： ULTRA COMMUNICATIONS, INC.

发明人： Joseph F. Ahadian ,  Vahid Nazer ,  Sandra Skendzic ,  Charles B. Kuznia ,  Richard J. Weiss

IPC分类号： H04B10/071 ,  H04B10/079

摘要： Methods and systems for automated health assessment of fiber optic links of a fiber optic communication system are described. Tables are used to describe the fiber optic links, including access addresses to communication modules used in the links. Telemetry data representative of operation of the communication modules can be read via the access addresses into a central station. OTDR/OFDR measurement data of fiber optic segments used in the links can be read via the access addresses into the central station. The telemetry and/or OTDR/OFDR measurement data can be used by the central station for comparison against reference data to assess health of the links. The communication modules locally and continuously capture the telemetry data to detect transient events that may be the result of tampering of the links.

公开(公告)号：US11515938B2

公开(公告)日：2022-11-29

申请号：US17164288

申请日：2021-02-01

申请人： VIAVI SOLUTIONS INC.

发明人： Julien Barrier

IPC分类号： H04B10/071 ,  G01M11/00

摘要： In some examples, automatic OTDR-based testing may include determining, based on analysis of a signal that is received from a DUT that is to be monitored, whether the DUT is optically connected. Based on a determination that the DUT is optically connected, a measurement associated with the DUT may be performed.

公开(公告)号：US20220360327A1

公开(公告)日：2022-11-10

申请号：US17869449

申请日：2022-07-20

申请人： VIAVI SOLUTIONS INC.

发明人： Charlène ROUX ,  Julien BARRIER

IPC分类号： H04B10/071 ,  H04B10/66 ,  H04B10/50 ,  H04B10/25

摘要： In some examples, high speed bidirectional OTDR-based testing may include transmitting data from a first end of a device under test (DUT) towards an optical time-domain reflectometer (OTDR) that is operatively connected to a second opposite end of the DUT. Further data that is transmitted by the OTDR may be received from the second opposite end of the DUT towards the first end of the DUT. Based on an amplitude of the further data, a direction of receiving of the further data may be adjusted towards a first receiver or towards a second receiver.

公开(公告)号：US20220345214A1

公开(公告)日：2022-10-27

申请号：US17490617

申请日：2021-09-30

申请人： DELL PRODUCTS L.P.

发明人： Said Tabet ,  Qing Ye ,  Rowland Shaw

IPC分类号： H04B10/071 ,  H04B10/25 ,  G06N20/00

摘要： A data communication network includes a plurality of network nodes and a processor. The network nodes each include an optical link and a reflectometry analyzer. The reflection analyzers provide reflectometry results that each provide a characterization of physical and operational properties of the associated optical link. The processor receives the reflectometry results from the reflectometry analyzers, and, for each optical link, analyzes the reflectometry results to determine a fingerprint of the physical and operational properties of the associated optical link. The processor further determines a status for each of the optical links based upon the associated fingerprints, and determines a first path between a first one of the network nodes and a second one of the network nodes based upon a first status of a first optical link in the first path and a second status of a second optical link in the path.

公开(公告)号：US20220345212A1

公开(公告)日：2022-10-27

申请号：US17490506

申请日：2021-09-30

申请人： DELL PRODUCTS, LP

发明人： Rowland Shaw ,  Qing Ye ,  Said Tabet

IPC分类号： H04B10/071 ,  H04B10/077

摘要： A data communication network includes a network node and a processor. The network node includes an optical link and a reflectometry analyzer to provide a plurality of reflectometry results, each reflectometry result providing a characterization of physical and operational properties of the optical link at the time of the reflectometry result. The processor receives a first set of the reflectometry results, and calculates a federated fingerprint of the physical and operational properties of the optical link based on the plurality of fingerprints in first set of the reflectometry results. The federated fingerprint is a combination of fingerprints from every section of the optical link. The processor receives a second set of the reflectometry results, and compares each of a plurality of fingerprints in the second set of reflectometry results with a respective corresponding fingerprint in the federated fingerprint. The processor determines whether a physical tampering of the optical link has occurred based upon the comparison.

公开(公告)号：US11483067B2

公开(公告)日：2022-10-25

申请号：US17270567

申请日：2019-04-25

申请人： NEC Corporation

发明人： Yuhei Matsumoto ,  Takefumi Oguma ,  Kazunori Shinya

IPC分类号： H04B10/40 ,  H04B10/071 ,  G01M11/00

摘要： An optical detection unit detects a return light and outputs a detection signal. An optical multiplexer/demultiplexer outputs the monitoring light to the optical transmission line, and outputs the return light to the optical detection unit. A processing unit detects a first timing at which the detection signal becomes less than a first threshold value, detects a second timing at which the detection signal becomes less than a second threshold value, and calculates a first change rate of the detection signal in a period between the first and second timings. The processing unit changes the first and second threshold values to calculate the first change rate for a plurality of periods, and, when a second change rate between the first change rates in two adjacent periods is greater than a threshold value, either of the first and second timings in one period is detected as the breakage position.