Patents by Inventor Huimin Ding

Huimin Ding has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20240012195
    Abstract: A method and apparatus for inscribing a high-temperature stable Bragg grating in an optical waveguide, comprising the steps of: providing the optical waveguide; providing electromagnetic radiation from an ultrashort pulse duration laser, wherein the wavelength of the electromagnetic radiation has a characteristic wavelength in the wavelength range from 150 nanometers (nm) to 2.
    Type: Application
    Filed: December 4, 2020
    Publication date: January 11, 2024
    Inventors: Cyril HNATOVSKY, Nurmemet ABDUKERIM, Dan GROBNIC, Robert WALKER, Stephen MIHAILOV, Ping LU, Huimin DING, David COULAS, Kasthuri DE SILVA
  • Publication number: 20230333313
    Abstract: T-phase-shifted fiber Bragg gratings in optical waveguides, and methods of formation thereof. Sensing apparatus comprising such gratings using femtosecond pulse duration lasers and specialized transmission diffraction elements or phase masks.
    Type: Application
    Filed: June 8, 2023
    Publication date: October 19, 2023
    Inventors: Cyril HNATOVSKY, Dan GROBNIC, Stephen MIHAILOV, Robert WALKER, Ping LU, Huimin DING, David COULAS, Kasthuri DE SILVA
  • Patent number: 11703636
    Abstract: A solution is provided comprising boron nitride nanotubes (BNNTs) in a liquid solvent. An optical waveguide, such as an optical fiber, is contacted with the solution so as to form a layer of the solution supported on at least a portion of the optical waveguide. The liquid solvent is then removed from the layer of the solution supported on the optical waveguide in order to form a coating of the BNNTs on the optical waveguide. Further provided is a BNNT coated optical waveguide for use as a sensor.
    Type: Grant
    Filed: April 30, 2020
    Date of Patent: July 18, 2023
    Inventors: Jingwen Guan, Huimin Ding, Ping Lu, Stephen Mihailov, Benoit Simard
  • Publication number: 20230194775
    Abstract: A method and apparatus for inscribing a Bragg grating in an optical waveguide, comprising: providing electromagnetic radiation from an ultrashort pulse duration laser, wherein the electromagnetic radiation has a pulse duration of less than or equal to 5 picoseconds, and wherein the wavelength of the electromagnetic radiation has a characteristic wavelength in the wavelength range from 150 nanometers (nm) to 2.0 microns (µm); providing cylindrical focusing optics corrected for spherical aberration; providing a diffractive optical element that when exposed to the focused ultrashort laser pulse, creates an interference pattern on the optical waveguide, wherein the irradiation step comprises irradiating a surface of the diffractive optical element with the focused electromagnetic radiation, the electromagnetic radiation incident on the optical waveguide, from the diffractive optical element, being sufficiently intense to cause the permanent change in the index of refraction in the core of the optical waveguide.
    Type: Application
    Filed: May 13, 2020
    Publication date: June 22, 2023
    Inventors: Cyril HNATOVSKY, Nurmemet ABDUKERIM, Dan GROBNIC, Stephen MIHAILOV, Rune LAUSTEN, Ping LU, Huimin DING, David COULAS, Kasthuri DE SILVA
  • Publication number: 20220229225
    Abstract: A solution is provided comprising boron nitride nanotubes (BNNTs) in a liquid solvent. An optical waveguide, such as an optical fiber, is contacted with the solution so as to form a layer of the solution supported on at least a portion of the optical waveguide. The liquid solvent is then removed from the layer of the solution supported on the optical waveguide in order to form a coating of the BNNTs on the optical waveguide. Further provided is a BNNT coated optical waveguide for use as a sensor.
    Type: Application
    Filed: April 30, 2020
    Publication date: July 21, 2022
    Inventors: Jingwen GUAN, Huimin DING, Ping LU, Stephen MIHAILOV, Benoit SIMARD
  • Publication number: 20220196508
    Abstract: An apparatus, method and system are set forth for detection of fluids using Bragg grating sensors, wherein the Bragg grating sensing element comprises an optical fiber having a Bragg grating inscribed therein characterized by optical properties that are dependent upon the periodicity and effective refractive index of the grating, and a package for subjecting the Bragg grating to a change in strain when contacted by a fluid such that periodicity and effective refractive index of the grating changes, whereby when interrogated with laser light any such change in periodicity and effective refractive index may be detected.
    Type: Application
    Filed: January 10, 2020
    Publication date: June 23, 2022
    Inventors: Cyril HNATOVSKY, Dan GROBNIC, Stephen MIHAILOV, Ping LU, Kasthuri DE SILVA, Huimin DING, David COULAS, Robert WALKER
  • Patent number: 11359939
    Abstract: Provided is an optical waveguide with an inscribed Bragg grating, where the Bragg grating is stable at high temperature, has low scattering loss and high reflectivity. Also provided is a method for inscribing a Bragg grating in an optical waveguide, the method comprising irradiating the optical waveguide with electromagnetic radiation from an ultrashort pulse duration laser of sufficient intensity to cause a permanent change in an index of refraction within a core of the optical waveguide, where the irradiating step is terminated prior to erasure of a Bragg resonance, and heating the optical waveguide to a temperature and for a duration sufficient to substantially remove a non-permanent grating formed in the optical waveguide by the irradiating step.
    Type: Grant
    Filed: November 19, 2020
    Date of Patent: June 14, 2022
    Assignee: NATIONAL RESEARCH COUNCIL OF CANADA
    Inventors: Dan Grobnic, Stephen Mihailov, Robert Walker, Ping Lu, Huimin Ding, David Coulas, Cyril Hnatovsky
  • Publication number: 20210318488
    Abstract: T-phase-shifted fiber Bragg gratings in optical waveguides, and methods of formation thereof. Sensing apparatus comprising such gratings using femtosecond pulse duration lasers and specialized transmission diffraction elements or phase masks.
    Type: Application
    Filed: June 18, 2019
    Publication date: October 14, 2021
    Inventors: Cyril HNATOVSKY, Dan GROBNIC, Stephen MIHAILOV, Robert WALKER, Ping LU, Huimin DING, David COULAS, Kasthuri DE SILVA,
  • Publication number: 20210072050
    Abstract: Provided is an optical waveguide with an inscribed Bragg grating, where the Bragg grating is stable at high temperature, has low scattering loss and high reflectivity. Also provided is a method for inscribing a Bragg grating in an optical waveguide, the method comprising irradiating the optical waveguide with electromagnetic radiation from an ultrashort pulse duration laser of sufficient intensity to cause a permanent change in an index of refraction within a core of the optical waveguide, where the irradiating step is terminated prior to erasure of a Bragg resonance, and heating the optical waveguide to a temperature and for a duration sufficient to substantially remove a non-permanent grating formed in the optical waveguide by the irradiating step.
    Type: Application
    Filed: November 19, 2020
    Publication date: March 11, 2021
    Inventors: Dan GROBNIC, Stephen MIHAILOV, Robert WALKER, Ping LU, Huimin DING, David COULAS, Cyril HNATOVSKY
  • Patent number: 10866125
    Abstract: Provided is an optical waveguide with an inscribed Bragg grating, where the Bragg grating is stable at high temperature, has low scattering loss and high reflectivity. Also provided is a method for inscribing a Bragg grating in an optical waveguide, the method comprising irradiating the optical waveguide with electromagnetic radiation from an ultrashort pulse duration laser of sufficient intensity to cause a permanent change in an index of refraction within a core of the optical waveguide, where the irradiating step is terminated prior to erasure of a Bragg resonance, and heating the optical waveguide to a temperature and for a duration sufficient to substantially remove a non-permanent grating formed in the optical waveguide by the irradiating step.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: December 15, 2020
    Assignee: NATIONAL RESEARCH COUNCIL OF CANADA
    Inventors: Dan Grobnic, Stephen Mihailov, Robert Walker, Ping Lu, Huimin Ding, David Coulas, Cyril Hnatovsky
  • Patent number: 10520669
    Abstract: There is provided an alignment system and method for use in an ultrashort pulse duration laser-based Fiber Bragg Grating (FBG) writing system, the alignment system comprising: clamps configured to hold a coated optical fiber in a position perpendicular to a beam path of an ultrashort pulse duration laser-based FBG writing station; an optical detector; and a control system with an input from the optical detector and an output to adjust parameters of an optical source and the FBG writing station adjust a distance between the optical fiber and an optical source of the writing station based on luminescence generated in a core of the optical fiber as indicated in a signal received at the input from the optical detector.
    Type: Grant
    Filed: September 1, 2017
    Date of Patent: December 31, 2019
    Assignee: National Research Council of Canada
    Inventors: Stephen Mihailov, Dan Grobnic, Rune Lausten, Robert Walker, Ping Lu, Huimin Ding, David Coulas, Cyril Hnatovsky
  • Publication number: 20190049272
    Abstract: Provided is an optical waveguide with an inscribed Bragg grating, where the Bragg grating is stable at high temperature, has low scattering loss and high reflectivity. Also provided is a method for inscribing a Bragg grating in an optical waveguide, the method comprising irradiating the optical waveguide with electromagnetic radiation from an ultrashort pulse duration laser of sufficient intensity to cause a permanent change in an index of refraction within a core of the optical waveguide, where the irradiating step is terminated prior to erasure of a Bragg resonance, and heating the optical waveguide to a temperature and for a duration sufficient to substantially remove a non-permanent grating formed in the optical waveguide by the irradiating step.
    Type: Application
    Filed: February 16, 2017
    Publication date: February 14, 2019
    Applicant: National Research Council of Canada
    Inventors: Dan Grobnic, Stephen Mihailov, Robert Walker, Ping Lu, Huimin Ding, David Coulas, Cyril Hnatovsky
  • Patent number: 10156680
    Abstract: An apparatus for use with a pulsed laser source for forming an optical grating in a target includes an adjustable telescope having an element with a negative optical power, for generation of a diverging optical beam, so that the optical beam has adjustable divergence upon exiting the telescope while focusing of light inside the telescope is avoided. A transmission diffraction grating is disposed in the optical beam exiting the telescope, for forming an optical interference pattern on the target. Optical gratings with different grating periods may be formed by adjusting the divergence of the optical beam exiting the telescope. Lack of tight focal spots inside the telescope enables use of ultrashort pulse duration, high peak intensity laser sources.
    Type: Grant
    Filed: July 10, 2015
    Date of Patent: December 18, 2018
    Assignee: National Research Council of Canada
    Inventors: Dan Grobnic, Stephen J. Mihailov, Robert B. Walker, Ping Lu, Huimin Ding, David Coulas
  • Publication number: 20180067254
    Abstract: There is provided an alignment system and method for use in an ultrashort pulse duration laser-based Fiber Bragg Grating (FBG) writing system, the alignment system comprising: clamps configured to hold a coated optical fiber in a position perpendicular to a beam path of an ultrashort pulse duration laser-based FBG writing station; an optical detector; and a control system with an input from the optical detector and an output to adjust parameters of an optical source and the FBG writing station adjust a distance between the optical fiber and an optical source of the writing station based on luminescence generated in a core of the optical fiber as indicated in a signal received at the input from the optical detector.
    Type: Application
    Filed: September 1, 2017
    Publication date: March 8, 2018
    Inventors: Stephen MIHAILOV, Dan GROBNIC, Rune LAUSTEN, Robert WALKER, Ping LU, Huimin DING, David COULAS, Cyril HNATOVSKY
  • Publication number: 20170192168
    Abstract: An apparatus for use with a pulsed laser source for forming an optical grating in a target includes an adjustable telescope having an element with a negative optical power, for generation of a diverging optical beam, so that the optical beam has adjustable divergence upon exiting the telescope while focusing of light inside the telescope is avoided. A transmission diffraction grating is disposed in the optical beam exiting the telescope, for forming an optical interference pattern on the target. Optical gratings with different grating periods may be formed by adjusting the divergence of the optical beam exiting the telescope. Lack of tight focal spots inside the telescope enables use of ultrashort pulse duration, high peak intensity laser sources.
    Type: Application
    Filed: July 10, 2015
    Publication date: July 6, 2017
    Inventors: Dan GROBNIC, Stephen J. MIHAILOV, Robert B. WALKER, Ping LU, Huimin DING, David COULAS
  • Publication number: 20130136857
    Abstract: An optical fiber recoating apparatus employs a variable size applicator for depositing a coating material in liquid form onto a portion of varying diameter optical fiber. The coating material is applied to the variable size applicator which is in continuous contact about the circumference of the optical fiber. At a constant speed the variable size applicator moves along the length of the optical fiber while simultaneously changing size to conform to the varying diameter of the optical fiber for applying a uniform coating thereto.
    Type: Application
    Filed: March 14, 2012
    Publication date: May 30, 2013
    Applicant: Her Majesty the Queen in Right of Canada, as represented by the Minister of Industry
    Inventors: Chantal Blanchetiere, Sarkis Jacob, Xiaoli Dai, Huimin Ding
  • Patent number: 8402789
    Abstract: A method of producing a thermally stable grating allows the grating to be placed in environments where temperatures reach 1000° C. These gratings may be concatenated so as to form a sensor array. The method requires a step of lowering the characteristic intensity threshold of a waveguide by at least 25%, followed by irradiating the waveguide with femtosecond pulses of light having a sufficient intensity and for a sufficient duration to write the grating so that at least 60% of the grating remains after exposures of at least 10 hours at a temperature of at least 1000° C. Pre-writing a Type I grating before writing a minimal damage Type II grating lowers the characteristic threshold of the waveguide so that a stable low damage type II grating can be written; alternatively providing a hydrogen or deuterium loaded waveguide before writing the grating lowers the characteristic threshold of the waveguide.
    Type: Grant
    Filed: August 23, 2012
    Date of Patent: March 26, 2013
    Assignee: Her Majesty the Queen in Right of Canada, as Represented by the Minister of Industry, Through the Communications Research Centre Canada
    Inventors: Christopher W. Smelser, Stephen J. Mihailov, Dan Grobnic, Ping Lu, Robert B. Walker, Gino Cuglietta, Huimin Ding, Xiaoli Dai
  • Publication number: 20120324959
    Abstract: A method of producing a thermally stable grating allows the grating to be placed in environments where temperatures reach 1000° C. These gratings may be concatenated so as to form a sensor array. The method requires a step of lowering the characteristic intensity threshold of a waveguide by at least 25%, followed by irradiating the waveguide with femtosecond pulses of light having a sufficient intensity and for a sufficient duration to write the grating so that at least 60% of the grating remains after exposures of at least 10 hours at a temperature of at least 1000° C. Pre-writing a Type I grating before writing a minimal damage Type II grating lowers the characteristic threshold of the waveguide so that a stable low damage type II grating can be written; alternatively providing a hydrogen or deuterium loaded waveguide before writing the grating lowers the characteristic threshold of the waveguide.
    Type: Application
    Filed: August 23, 2012
    Publication date: December 27, 2012
    Applicants: the Communications Research Centre Canada
    Inventors: Christopher W. Smelser, Stephen J. Mihailov, Dan Grobnic, Ping Lu, Robert B. Walker, Gino Cuglietta, Huimin Ding, Xiaoli Dai
  • Patent number: 7689087
    Abstract: A method of inducing birefringence in an optical waveguide is disclosed wherein the waveguide cladding is irradiated with energy of a sufficient intensity so as to induce a stress in the optical waveguide so as to cause a multitude of spaced stress induced regions within the cladding of the optical waveguide such that there are 10 to 5000 spaced regions per mm and wherein the stress induced regions are proximate the core greater than 2 microns distance from the core-cladding interface. This waveguide has numerous uses, for example a fiber sensor.
    Type: Grant
    Filed: July 9, 2008
    Date of Patent: March 30, 2010
    Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of Industry, Through the Communications Research Centre Canada
    Inventors: Stephen J. Mihailov, Dan Grobnic, Christopher W. Smelser, Robert B. Walker, Ping Lu, Xiaoli Dai, Huimin Ding, Gino Cuglietta
  • Patent number: D992836
    Type: Grant
    Filed: January 16, 2023
    Date of Patent: July 18, 2023
    Inventor: Huimin Ding