公开(公告)号：US20250044191A1

公开(公告)日：2025-02-06

申请号：US18362145

申请日：2023-07-31

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Xiaoyi BAO ,  Yuan WANG

IPC: G01M11/00

Abstract: System and method for determining distributed birefringence variations in a polarization-maintaining optical fiber (PM fiber). The method includes causing a pump signal to be sent into the PM fiber to generate a Brillouin dynamic grating (BDG) therein, causing a first chirped probe optical pulse to be sent into the PM fiber, receiving a first reflected signal, the first reflected signal being a first portion of the first chirped probe optical pulse reflected by the BDG, receiving a second reflected signal, the second reflected signal being a second portion of the first chirped probe optical pulse reflected by the BDG, and determining a variation of birefringence of the PM fiber indicative of a variation of physical disturbance of the PM fiber between times of reflections on the BDG of the first and second reflected signals.

公开(公告)号：US20250020541A1

公开(公告)日：2025-01-16

申请号：US18769630

申请日：2024-07-11

Applicant: EZconn Corporation

Inventor： Chin-Tsung Wu

IPC: G01M11/00 ,  H04B10/071

Abstract: An optical sub-assembly with OTDR filter includes a plug-in unit and a sending/receiving unit. The sending/receiving unit includes a main body surrounding an axis, an upstream transmitter, an isolator, a first filter, a second filter and a downstream receiver. The plug-in unit includes a housing, a fiber stub, a sleeve, a stopper and an OTDR filter. The OTDR optical reflector (OTDR filter) is installed inside the optical sub-assembly, it saves space and costs by omitting the conventional FBG and can achieve the same effect as reflecting the OTDR monitoring light.

公开(公告)号：US12181369B2

公开(公告)日：2024-12-31

申请号：US17694151

申请日：2022-03-14

Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.

Inventor： Wolfgang Schade

IPC: G01M11/08 ,  A61B34/20 ,  G01B11/16 ,  G01L1/24 ,  G01M11/00 ,  G06N3/08

Abstract: A method for determining the shape of an optical waveguide (1) having a plurality of fiber Bragg gratings (15) includes the following steps: coupling light (20) of a light source (2) into the optical waveguide (1), coupling the reflected light out of the optical waveguide (1), determining a spectrum (35) of the reflected light by measuring the intensity (I) versus the wavelength (λ), the spectrum (35) being fed to a self-learning neural network (4) and the shape of the optical waveguide (1) being determined by the neural network. A device for determining the shape of an optical waveguide (1) may be used in a catheter or an endoscope or a biopsy needle or an aerodynamic profiled element. A device for producing training data for a neural network to implement the above is also contemplated.

公开(公告)号：US12181346B2

公开(公告)日：2024-12-31

申请号：US17903313

申请日：2022-09-06

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Ki Hong Choi ,  Joong Ki Park ,  Kee Hoon Hong

IPC: G01N21/95 ,  G01J3/447 ,  G01J4/04 ,  G01J9/00 ,  G01M11/00 ,  G01N21/21

Abstract: Disclosed herein an apparatus and method for estimating a phase retarder and method of manufacturing the phase retarder using the same. The apparatus includes: a polarization element configured to output an incident light as a linear polarization and to make the linear polarization incident onto a phase retarder to be tested; a polarization image acquisition module equipped with a plurality of polarized pixels receiving an emitting light that is output from the phase retarder, on which the linear polarization is incident, and configured to obtain a polarization image based on the emitting light that is modulated in the polarized pixels; and a processor configured to evaluate quality of the phase retarder based on uniformity of a brightness value between polarized pixels of the polarization image. The polarized pixels modulate the emitting light based on a plurality of transmission angles and detects the modulated emitting light.

公开(公告)号：US12169153B2

公开(公告)日：2024-12-17

申请号：US16856787

申请日：2020-04-23

Applicant: 6 OVER 6 VISION LTD.

Inventor： Ofer Limon ,  Haim Bachar ,  Nir Altmark ,  Shahar Levy

IPC: G01M11/00 ,  A61B3/02 ,  G01M11/02 ,  G02C7/02 ,  G02C13/00 ,  G06T7/00

Abstract: Some demonstrative embodiments include apparatuses, systems and/or methods of determining one or more optical parameters of a lens of eyeglasses. For example, a product may include one or more tangible computer-readable non-transitory storage media including computer-executable instructions operable to, when executed by at least one computer processor, enable the at least one computer processor to implement operations of determining one or more optical parameters of a lens of eyeglasses. The operations may include processing at least one image of an object captured via the lens; and determining the one or more optical parameters of the lens based on the at least one image.

公开(公告)号：US20240402043A1

公开(公告)日：2024-12-05

申请号：US18205985

申请日：2023-06-05

Applicant: OFS FITEL, LLC

Inventor： Alan H McCurdy

IPC: G01M11/00

Abstract: Embodiments of the invention include an optical time domain reflectometer (OTDR) device having a transmitter for transmitting a series of optical pulses, a processor for controlling the duration and frequency of the transmitted optical pulses, an optical coupler for directing the transmitted optical pulses to a device under test coupled to the OTDR and receiving light reflected back from the device under test, a detector for converting light reflected back from the device under test to an electrical signal, a display for displaying a plot of the electrical signal, and a gating function device for removing at least one saturation event from the light reflected back from the device under test. The operation of the gating function device is controlled by a gating signal provided by the processor to the gating function device. The gating signal is based on at least one characteristic of the saturation event.

公开(公告)号：US12158363B2

公开(公告)日：2024-12-03

申请号：US18096595

申请日：2023-01-13

Applicant: SUBCOM, LLC

Inventor： Rong Zhu

IPC: G01D5/353 ,  G01K11/322 ,  G01L1/24 ,  G01M11/00

Abstract: Methods of measuring an anomaly, any induced change in physical parameters such as strain, temperature, and so forth, in an optical fiber. One method may include launching a plurality of probe pulses from a probe source; recording a Brillouin scattering spectrum from a plurality of reflection signals generated in the optical fiber, responsive to the plurality of probe pulses; determining a relative motion between the optical fiber and the anomaly during the recording the Brillouin back-scattering spectrum; and dynamically adjusting the Brillouin back-scattering spectrum according to the relative motion, or performing an adjustment of the Brillouin back-scattering spectrum after acquisition of the Brillouin back-scattering spectrum.

公开(公告)号：US20240385073A1

公开(公告)日：2024-11-21

申请号：US18693767

申请日：2022-10-05

Applicant: LYNRED

Inventor： Lilian Martineau

IPC: G01M11/02 ,  G01J1/04 ,  G01J1/08 ,  G01M11/00

Abstract: A device for measuring the performance of an optical detector includes a cryostat, a holder capable of receiving the detector, secured to the inside of the cryostat, and means for measuring the performance of the detector. It also includes a screen arranged around the holder capable of limiting the radiation likely to reach the holder in a wavelength range of the detector, and a single-mode optical fiber in the wavelength range of the detector, inserted in an opening of the cryostat. The device further comprises at least one luminous flux generation module that incorporates a fibered source capable of generating the luminous flux in the optical fiber.

公开(公告)号：US12149281B2

公开(公告)日：2024-11-19

申请号：US17687098

申请日：2022-03-04

Applicant: VIAVI SOLUTIONS INC.

Inventor： Patrick Faraj

IPC: H04B10/07 ,  G01M11/00 ,  H04B10/071 ,  H04J14/02

Abstract: According to examples, an apparatus may include a wavelength division multiplexing (WDM) module including a WDM housing having a WDM front panel and a WDM component housed within the WDM housing. The apparatus may also include an optical time-domain reflectometer (OTDR)/switch module integrated with the WDM module, the OTDR/switch module including an OTDR housing having an OTDR front panel and an OTDR/switch component housed within the OTDR housing. The WDM housing may be connectable with the OTDR housing to cause respective side edges of the WDM front panel and the OTDR front panel to be adjacent to each other when the WDM housing is connected to the OTDR housing.

公开(公告)号：US12146807B2

公开(公告)日：2024-11-19

申请号：US17281627

申请日：2019-10-01

Applicant: Sunrise International, Inc.

Inventor： Craig T. Walters ,  David Sokol

IPC: G01M11/08 ,  G01M11/00 ,  G01N19/04 ,  G01N29/04 ,  G01N29/24 ,  G02B6/04 ,  G02B6/32 ,  G02B6/42

Abstract: Systems, methods and device provided for combining or splitting laser beams, including a plurality of optical fibers for providing laser beams, an image relay lens for each of the plurality of optical fibers, positioning a prism beam combiner or splitter after the image relay lenses for combining or splitting the laser beams. According to another aspect, the a prism beam combiner or splitter may include a flattened tip to transmit a portion of an input laser beam, a position sensitive detector to receive the transmitted portion of the input laser beam to track a beam axis motion and provide feedback alignment error signals based on the beam axis motion, and a driver to receive the feedback alignment error signals and to drive a motor or piezo actuated beam steering minor based on the feedback alignment error signals, wherein a laser bond inspection method implements the described systems and methods.