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公开(公告)号：US20240012167A1
公开(公告)日：2024-01-11
申请号：US18329133
申请日：2023-06-05
Applicant: EXFO Inc.
Inventor： Hongxin CHEN , Michel LEBLANC , Michel LECLERC
Abstract: There is provided a method and an apparatus of fiber optic distributed acoustic sensing (DAS) which can use low-cost coherent laser as well as low-cost acquisition and processing electronics and which can still provide reliable monitoring results for optical fiber monitoring and troubleshooting applications in optical fiber telecommunication networks. Such low-cost solution is made possible by employing grouped data signal processing. Data is processed over independent groups of data to provide an independent DAS signal for each group. This allows measurements to be less sensitive to laser fluctuations and thereby reduces coherent laser technical specification requirements and allows the use of a low-cost coherent laser (thereby reducing the cost of the laser) as well as low-cost acquisition and processing electronics.
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公开(公告)号：US20220390321A1
公开(公告)日：2022-12-08
申请号：US17738295
申请日：2022-05-06
Applicant: EXFO Inc.
Inventor： Michel LECLERC
IPC: G01M11/00
Abstract: 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.
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公开(公告)号：US20230228649A1
公开(公告)日：2023-07-20
申请号：US18096456
申请日：2023-01-12
Applicant: EXFO Inc.
Inventor： Michel LECLERC , Nicholas COLE
IPC: G01M11/00
CPC classification number: G01M11/33
Abstract: There is provided herein a solution for measuring the optical power loss of duplex optical-fiber devices under test, and particularly those terminated with a duplex connector interface, which allows for a one-cord or one-cord equivalent testing method whichever the format of the duplex connector interface of the optical-fiber device under test, and this without disconnecting the optical fibers of the device under test from their duplex native connector interface. There is provided an optical-fiber expansion device to be used to interconnect and adapt a power meter instrument to a variety of duplex connectors. The proposed optical-fiber expansion device comprises a pair of optical fibers having a core diameter and a numerical aperture that are greater than those of the optical fiber in the DUT connector interface, so as to make it compatible with the one-cord testing method. Interchangeable optical-fiber expansion devices can be used to match the power meter interface on one side, to various duplex connector interfaces under test on the other side.
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Patent Agency Ranking
公开(公告)号：US20220128434A1
公开(公告)日：2022-04-28
申请号：US17451397
申请日：2021-10-19
Applicant: EXFO Inc.
Inventor： Stephane PERRON , Michel LECLERC , Pascal GOSSELIN-BADAROUDINE
IPC: G01M11/00
Abstract: There are provided methods and systems for testing the continuity of optical fiber links under test and/or a fiber arrangement, polarity or mapping of optical fiber connections within optical devices under test using the backscattering pattern as a signature. The device under test may comprises a single fiber, a duplex link, a multifiber cable or another multi-port device such as a backplane device.
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公开(公告)号：US20240410784A1
公开(公告)日：2024-12-12
申请号：US18661018
申请日：2024-05-10
Applicant: EXFO INC.
Inventor： Alexandre DRAPEAU , Michel LECLERC
IPC: G01M11/00
Abstract: An optical test device, in combination with a removable connector adapter, is provided. A method of testing an optical fiber is also provided. The test device comprises a test port configured to interface with optical-fiber cables having a given number of optical fibers. The connector adapter comprises a device connector adapted to connect to test port; and a fiber-under-test (FUT) connector adapted connect to an optical-fiber cable, such as a test cord connectable to the FUT. The FUT connector is configured to interface with optical-fiber cables having a number of fibers that is different from the number of fibers of the test port. The optical test device comprises a processing unit configurable to adjust the tests to be conducted based on the connector adapter detected, and to adapt the user interfaces and test parameters accordingly.
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公开(公告)号：US20220268665A1
公开(公告)日：2022-08-25
申请号：US17648866
申请日：2022-01-25
Applicant: EXFO Inc.
Inventor： Michel LECLERC
IPC: G01M11/00
Abstract: There is provided optical power loss measurement method and system for that aims to provide a more productive way to perform optical power loss measurements involving test units typically at different locations. Visual fiber finder light can be used to assist the user at the other end of the optical fiber link under test in identifying where to connect the power meter unit. A visual fiber finder light and test light are combined on a same output port of a light source unit at one end of the optical fiber link under test wherein visual fiber finder light is interleaved with test light in a cyclic sequence so that both are not active at the same time. The optical power meter unit determines a time slot when to measure test light in accordance with the given cyclic sequence.
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公开(公告)号：US20220038177A1
公开(公告)日：2022-02-03
申请号：US17443607
申请日：2021-07-27
Applicant: EXFO Inc.
Inventor： Gang HE , Michel LECLERC
IPC: H04B10/079 , G02B6/42
Abstract: There are provided herein test instruments, devices and methods for measuring the optical power loss of optical-fiber devices under test, and particularly those terminated with multifiber connectors, which allows for a one-cord or one-cord equivalent reference method whichever the pinning of the actual optical-fiber device under test. There is proposed to add an optical-fiber expansion device to convert the pinning of the input interface of the power meter instrument from pinned to unpinned or vice-versa, while not adding extra measurement uncertainty. This is accomplished using a patch cord which core diameter is between that of the device under test and that of the input interface of the power meter instrument.
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公开(公告)号：US20210404909A1
公开(公告)日：2021-12-30
申请号：US17360357
申请日：2021-06-28
Applicant: EXFO Inc.
Inventor： Michel LECLERC , Pascal GOSSELIN-BADAROUDINE , Stephane PERRON
Abstract: There are provided methods and systems that enable the use of the backscattering pattern produced by an optical fiber in an OTDR trace as a signature (also referred to herein as the “RBS fingerprint”) to recognize an optical fiber. It was found that it may be difficult to obtain repeatable signatures as those are sensitive to the wavelength of the OTDR laser source and the temperature of the fiber. OTDR methods and systems that are adapted to compare the backscattering pattern in a more repeatable manner are therefore provided. Once the repeatability issue is overcome, such signature can be used for identification purposes and enable new applications.
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