公开(公告)号：US12050150B2

公开(公告)日：2024-07-30

申请号：US17738295

申请日：2022-05-06

申请人： EXFO Inc.

发明人： Michel Leclerc

IPC分类号： G01M11/00 ,  H04B10/071 ,  H04B10/2513

CPC分类号： G01M11/3127 ,  G01M11/3145 ,  H04B10/071 ,  H04B10/2513

摘要： There is provided a technique to reduce the Rayleigh coherence noise in OTDR measurements using spectral averaging of OTDR traces while at least partly cancelling chromatic dispersion pulse broadening on the averaged OTDR trace by applying a chromatic dispersion correction prior to averaging the OTDR traces. By correcting for chromatic dispersion pulse broadening, it allows to reduce the Rayleigh coherence noise without impacting the OTDR spatial resolution.

公开(公告)号：US11949248B2

公开(公告)日：2024-04-02

申请号：US17755002

申请日：2020-09-17

申请人： KYOCERA CORPORATION

发明人： Takahiro Kobayashi

IPC分类号： H02J50/30 ,  G01S7/481 ,  G01S17/10 ,  H02J50/80 ,  H04B10/071 ,  H04B10/25 ,  H04B10/80

CPC分类号： H02J50/30 ,  G01S7/4818 ,  G01S17/10 ,  H02J50/80 ,  H04B10/071 ,  H04B10/25 ,  H04B10/807

摘要： To improve the optical power supply efficiency, a power-over-fiber system includes a power sourcing equipment including a semiconductor laser that oscillates with electric power to output feed light, a powered device including a photoelectric conversion element that converts the feed light into electric power, a plurality of optical fiber cables that transmit the feed light, a measurer that measures a distance from the power sourcing equipment to the powered device, and a control device that controls the power sourcing equipment to output the feed light after compensating for an amount of attenuation of the feed light according to a transmission distance on the basis of the distance from the power sourcing equipment to the powered device measured by the measurer.

公开(公告)号：US11910134B2

公开(公告)日：2024-02-20

申请号：US17363532

申请日：2021-06-30

申请人： Google LLC

发明人： Jill Berger ,  Kevin Yasumura ,  Xiang Zhou ,  Pedram Z. Dashti ,  Ryohei Urata

IPC分类号： H04B10/071 ,  H04B10/079 ,  H04Q11/00 ,  G02B6/35 ,  G02B26/08 ,  G02B27/30

CPC分类号： H04Q11/0005 ,  G02B6/3518 ,  G02B26/0833 ,  G02B27/30 ,  H04B10/071 ,  H04B10/0795 ,  H04Q2011/003 ,  H04Q2011/0039

摘要： An optical links diagnostic system (LDS) and its operation within an optical circuit switch (OCS) for measurement and diagnosis of fiber-optic network fiber performance and quality is disclosed. The LDS can contain two photodetectors, a laser source, and be coupled to an OCS. Optical circulators can further be linked to the OCS. The LDS can be used both as an optical time domain reflectometer (OTDR) or as an optical return loss (ORL) meter and can automate the diagnosis of the fiber optical network fiber insertion loss and return loss.

公开(公告)号：US20240022323A1

公开(公告)日：2024-01-18

申请号：US18476617

申请日：2023-09-28

申请人： VIAVI SOLUTIONS INC.

发明人： Benoit MOREL

IPC分类号： H04B10/071 ,  H04B10/079 ,  H04B10/27

CPC分类号： H04B10/071 ,  H04B10/07955 ,  H04B10/27

摘要： In some examples, OTDR event detection and light power level measurement-based fiber optic link certification may include performing, at one end of a device under test (DUT) of a network, a light power level measurement. An OTDR measurement may be performed at the one end of the DUT to detect at least one event associated with the DUT. Based on analysis of the light power level measurement and the OTDR measurement, an event classification may be generated to classify the at least one event associated with the DUT.

公开(公告)号：US11838049B2

公开(公告)日：2023-12-05

申请号：US17520375

申请日：2021-11-05

申请人： VIAVI SOLUTIONS INC.

发明人： Benoit Morel

IPC分类号： H04B10/071 ,  H04B10/079 ,  H04B10/27

CPC分类号： H04B10/071 ,  H04B10/07955 ,  H04B10/27

摘要： In some examples, OTDR event detection and light power level measurement-based fiber optic link certification may include performing, at one end of a device under test (DUT) of a network, a light power level measurement. An OTDR measurement may be performed at the one end of the DUT to detect at least one event associated with the DUT. Based on analysis of the light power level measurement and the OTDR measurement, an event classification may be generated to classify the at least one event associated with the DUT.

公开(公告)号：US11824581B2

公开(公告)日：2023-11-21

申请号：US17399295

申请日：2021-08-11

申请人： Ciena Corporation

发明人： Choudhury A. Al Sayeed ,  Song Cao ,  Na Young Kim

IPC分类号： H04B10/29 ,  H04B10/03 ,  H04B10/25 ,  H01S3/067 ,  H01S3/23 ,  H01S3/30 ,  H04B10/291 ,  H04B10/071 ,  H04B10/07 ,  H04B10/293

CPC分类号： H04B10/03 ,  H01S3/06716 ,  H01S3/2316 ,  H01S3/30 ,  H04B10/25 ,  H04B10/07 ,  H04B10/071 ,  H04B10/29 ,  H04B10/2916 ,  H04B10/2935

摘要： Systems and methods are provided for creating a sequence of turn-up processes for amplifiers. A method, according to one implementation, includes determining when a fiber span is initially installed in an optical line system or when an Optical Line Failure (OLF) in the fiber span has recovered. The optical line system includes a first set of amplifiers deployed at an upstream node and a second set of amplifiers deployed at a downstream node, the upstream node connected to the downstream node via the fiber span. In response to determining that the fiber span is initially installed in the optical line system or that an ORL in the fiber span has recovered, the method also includes sending a flag from the upstream node to the downstream node to allow the first set of amplifiers to perform a first turn-up process before the second set of amplifiers perform a second turn-up process.

公开(公告)号：US11811449B2

公开(公告)日：2023-11-07

申请号：US17861436

申请日：2022-07-11

申请人： VIAVI SOLUTIONS INC.

发明人： Charlène Roux ,  Julien Barrier

IPC分类号： H04B10/071 ,  H04B10/25 ,  H04B10/50 ,  H04B10/66 ,  H04B10/40

CPC分类号： H04B10/071 ,  H04B10/25 ,  H04B10/50 ,  H04B10/66 ,  H04B10/40

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：US20230344514A1

公开(公告)日：2023-10-26

申请号：US18131024

申请日：2023-04-05

申请人： VIAVI SOLUTIONS INC.

发明人： Julien BARRIER ,  Olivier RECEVEUR

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

CPC分类号： H04B10/071 ,  H04B10/40 ,  G01M11/3154 ,  G01M11/3136

摘要： In some examples, high speed bidirectional test of dual-fiber link may include providing at least one optical time-domain reflectometer (OTDR) and at least one optical data transceiver. At least one m×n optical switch may be optically connected to the at least one OTDR, the at least one optical data transceiver, and at least two fibers of a cable under test. For the m×n optical switch, m and n are at least two.

公开(公告)号：US11742941B2

公开(公告)日：2023-08-29

申请号：US17581608

申请日：2022-01-21

申请人： VIAVI SOLUTIONS INC.

发明人： Jean Ponchon

IPC分类号： H04B10/07 ,  H04B10/071 ,  H04J14/02 ,  H04Q11/00

CPC分类号： H04B10/071 ,  H04J14/0227 ,  H04Q11/0005

摘要： In some examples, a tunable dense wavelength division multiplexing (DWDM) optical time-domain reflectometer (OTDR) may include a fiber optic link analyzer, executed by at least one hardware processor, to determine, based on a user input, for a fiber optic link of a plurality of fiber optic finks of a fiber optic cable, whether the fiber optic fink is active or not active. The DWDM OTDR may specify, based on a determination that the fiber optic fink is active, a test wavelength that is different from a data transmission wavelength of data transmitted by the fiber optic fink. A DWDM multiplexer may be collocated with the DWDM OTDR to selectively connect, based on the specified test wavelength, the DWDM OTDR to the fiber optic fink of the plurality of fiber optic links for testing of the fiber optic link.

公开(公告)号：US20230231625A1

公开(公告)日：2023-07-20

申请号：US18010311

申请日：2020-06-26

申请人： Nippon Telegraph and Telephone Corporation

发明人： Hiroyuki IIDA ,  Hidenobu HIROTA ,  Takui UEMATSU

IPC分类号： H04B10/071

CPC分类号： H04B10/071

摘要： An object of the present invention is to provide a terminal determination device and a terminal determination method, which enable identification of a reflection signal from a terminal portion of an optical fiber to be measured even in a case where a reflection signal caused by multiple reflection appears in an OTDR waveform in a mode in which an OTDR and the optical fiber to be measured are connected at a bent portion.
The reflection signal caused by multiple reflection inevitably propagates through a distance equal to a distance between true reflection points more than the other reflection point, because of multiple reflection. Therefore, a distance between the reflection signal and another reflection signal is inevitably coincident with a distance between the other reflection signals. In contrast, in a case of a reflection signal from a terminal portion 51 of the optical fiber, the distance between the reflection signal and another reflection signal is not coincident with the distance between the other reflection signals.