公开(公告)号：US20230254788A1

公开(公告)日：2023-08-10

申请号：US18087276

申请日：2022-12-22

Applicant: EXFO Inc.

Inventor： Dominic LAPIERRE ,  Luc GERMAIN

IPC: H04W56/00 ,  H04L5/14 ,  H04W24/08

CPC classification number: H04W56/001 ,  H04L5/14 ,  H04W24/08

Abstract: A Radio Frequency (RF) spectrum analyzer includes an RF front end including a single antenna configured to monitor a wireless network that includes Time Division Duplexing (TDD); and circuitry connected to the RF front end and configured to operate and monitor the wireless network both in a spectrum analyzer mode and a signal analyzer mode, utilize the signal analyzer mode to extract synchronization information from the monitored wireless network, derive a start of frame of a radio frame from said the synchronization information; and utilize the synchronization information to identify an acquisition window to synchronize a gate in the spectrum analyzer mode.

公开(公告)号：USD989645S1

公开(公告)日：2023-06-20

申请号：US29789696

申请日：2021-10-14

Applicant: EXFO Inc.

Designer： Olivier Patry

Abstract: FIG. 1 is a perspective view of a portable test instrument showing the new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left-side elevation view thereof;
FIG. 5 is a right-side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines shown are included for the purpose of illustrating portions of the portable test instrument that form no part of the claim.

公开(公告)号：US11644625B2

公开(公告)日：2023-05-09

申请号：US17443496

申请日：2021-07-27

Applicant: EXFO Inc.

Inventor： Jean Filion ,  Olivier Cote

IPC: G02B6/38 ,  G02B21/00

CPC classification number: G02B6/3825 ,  G02B6/385 ,  G02B6/3853 ,  G02B21/0016

Abstract: There is provided an adapter tip to be employed with an optical-fiber connector endface inspection microscope and an optical-fiber connector endface inspection microscope system suitable for imaging the optical-fiber endface of an angled-polished optical-fiber connector deeply recessed within a connector adapter. The adapter tip or microscope system comprises a relay optical system comprising a Rhomboid prism. The Rhomboid prism being disposed so as to receive light reflected from said optical-fiber endface during inspection and laterally shift the light beam reflected from the angled-polished optical-fiber endface.

公开(公告)号：US20230060909A1

公开(公告)日：2023-03-02

申请号：US17891405

申请日：2022-08-19

Applicant: EXFO Inc.

Inventor： Jonathan PLANTE ,  Justin WHATLEY ,  Sylvain NADEAU

IPC: G01R31/3183 ,  G01R31/3185 ,  G06K9/62 ,  G06N20/00

Abstract: Example embodiments are disclosed of systems and methods for predicting failure probabilities of future product tests of a testing sequence based on outcomes of prior tests. Predictions are made by a machine-learning-based model (MLM) trained with a set of test-result sequence records (TRSRs) including test values and pass/fail indicators (PRIs) of completed tests. Within training epochs over the set, iterations are carried out over each TRSR. Each iteration involves sub-iterations carried out successively over test results of the TRSR. Each sub-iteration involves (i) inputting to the MLM values of a given test and those of tests earlier in the sequence while masking those later in the sequence, (ii) computing probabilities of test failures for the masked tests found later in the sequence than the given test, and (iii) applying the PFIs of test results later in the sequence than the given test as ground-truths to update parameters of the MLM.

公开(公告)号：US20230033680A1

公开(公告)日：2023-02-02

申请号：US17864607

申请日：2022-07-14

Applicant: EXFO Inc.

Inventor： Justin M. Whatley

IPC: H04L41/0631 ,  G06N5/02 ,  H04L41/0677

Abstract: In an embodiment computer-readable training data records characterizing operation of a communication network may be used to train a machine learning (ML) model of network performance to predict expected performance characteristics, each training data record including operational features and observed performance characteristics of the communication network. The ML model may compute mappings of feature-values pairs to predicted performance characteristics. For a first subset of training data records, a fair distribution of first quantitative contributions of operational features of predicted performance characteristics may be computed, the first subset representing a baseline of observed performance characteristics. For a second subset of training data records, a fair distribution of second respective quantitative contributions of predicted performance characteristics may be computed, the second subset representing a problematic performance characteristic. Comparing the first and second quantitative contributions may determine a degradation metric for associating operational features of the second subset with the problematic performance characteristic.

公开(公告)号：USD965455S1

公开(公告)日：2022-10-04

申请号：US29761049

申请日：2020-12-07

Applicant: EXFO Inc.

Designer： Olivier Patry

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.

公开(公告)号：USD960735S1

公开(公告)日：2022-08-16

申请号：US29761056

申请日：2020-12-07

Applicant: EXFO Inc.

Designer： Olivier Patry

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.

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

IPC: G01M11/00 ,  G06K9/00

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.