Patents by Inventor Dan Grobnic
Dan Grobnic 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).
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Publication number: 20240012195Abstract: 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: ApplicationFiled: December 4, 2020Publication date: January 11, 2024Inventors: Cyril HNATOVSKY, Nurmemet ABDUKERIM, Dan GROBNIC, Robert WALKER, Stephen MIHAILOV, Ping LU, Huimin DING, David COULAS, Kasthuri DE SILVA
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Publication number: 20230420046Abstract: The present invention provides an efficient quantum memory for storing a quantum state of light, such as a photon, for a temporary period of time in a fibre-integrated optical cavity and then recall the quantum state of light and quantum information at a later time with a high probability of success. The present invention uses a nonlinear optical switching mechanism to modify at least one property of the quantum light, or cavity, to trap the quantum light in the optical cavity. Subsequent application of the nonlinear optical switching mechanism switches at least one property of the stored quantum light, or cavity, to release the quantum light from the optical cavity. The present invention also provides quasi-deterministic single-photon generation by temporal multiplexing of a photon pair source integrated within the cavity.Type: ApplicationFiled: December 7, 2021Publication date: December 28, 2023Inventors: Philip J. BUSTARD, Duncan G. ENGLAND, Benjamin J. SUSSMAN, Stephen MIHAILOV, Cyril HNATOVSKY, Dan GROBNIC
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Publication number: 20230333313Abstract: 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: ApplicationFiled: June 8, 2023Publication date: October 19, 2023Inventors: Cyril HNATOVSKY, Dan GROBNIC, Stephen MIHAILOV, Robert WALKER, Ping LU, Huimin DING, David COULAS, Kasthuri DE SILVA
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FIBER BRAGG GRATING SENSOR IN POLYMER-COATED ULTRA-THIN OPTICAL FIBERS AND METHOD FOR PRODUCING SAME
Publication number: 20230194775Abstract: 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: ApplicationFiled: May 13, 2020Publication date: June 22, 2023Inventors: Cyril HNATOVSKY, Nurmemet ABDUKERIM, Dan GROBNIC, Stephen MIHAILOV, Rune LAUSTEN, Ping LU, Huimin DING, David COULAS, Kasthuri DE SILVA -
Publication number: 20220196508Abstract: 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: ApplicationFiled: January 10, 2020Publication date: June 23, 2022Inventors: Cyril HNATOVSKY, Dan GROBNIC, Stephen MIHAILOV, Ping LU, Kasthuri DE SILVA, Huimin DING, David COULAS, Robert WALKER
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Patent number: 11359939Abstract: 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: GrantFiled: November 19, 2020Date of Patent: June 14, 2022Assignee: NATIONAL RESEARCH COUNCIL OF CANADAInventors: Dan Grobnic, Stephen Mihailov, Robert Walker, Ping Lu, Huimin Ding, David Coulas, Cyril Hnatovsky
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Publication number: 20210318488Abstract: 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: ApplicationFiled: June 18, 2019Publication date: October 14, 2021Inventors: Cyril HNATOVSKY, Dan GROBNIC, Stephen MIHAILOV, Robert WALKER, Ping LU, Huimin DING, David COULAS, Kasthuri DE SILVA,
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Publication number: 20210072050Abstract: 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: ApplicationFiled: November 19, 2020Publication date: March 11, 2021Inventors: Dan GROBNIC, Stephen MIHAILOV, Robert WALKER, Ping LU, Huimin DING, David COULAS, Cyril HNATOVSKY
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Patent number: 10866125Abstract: 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: GrantFiled: February 16, 2017Date of Patent: December 15, 2020Assignee: NATIONAL RESEARCH COUNCIL OF CANADAInventors: Dan Grobnic, Stephen Mihailov, Robert Walker, Ping Lu, Huimin Ding, David Coulas, Cyril Hnatovsky
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Patent number: 10520669Abstract: 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: GrantFiled: September 1, 2017Date of Patent: December 31, 2019Assignee: National Research Council of CanadaInventors: Stephen Mihailov, Dan Grobnic, Rune Lausten, Robert Walker, Ping Lu, Huimin Ding, David Coulas, Cyril Hnatovsky
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Publication number: 20190049272Abstract: 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: ApplicationFiled: February 16, 2017Publication date: February 14, 2019Applicant: National Research Council of CanadaInventors: Dan Grobnic, Stephen Mihailov, Robert Walker, Ping Lu, Huimin Ding, David Coulas, Cyril Hnatovsky
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Patent number: 10156680Abstract: 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: GrantFiled: July 10, 2015Date of Patent: December 18, 2018Assignee: National Research Council of CanadaInventors: Dan Grobnic, Stephen J. Mihailov, Robert B. Walker, Ping Lu, Huimin Ding, David Coulas
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Publication number: 20180067254Abstract: 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: ApplicationFiled: September 1, 2017Publication date: March 8, 2018Inventors: Stephen MIHAILOV, Dan GROBNIC, Rune LAUSTEN, Robert WALKER, Ping LU, Huimin DING, David COULAS, Cyril HNATOVSKY
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Publication number: 20170192168Abstract: 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: ApplicationFiled: July 10, 2015Publication date: July 6, 2017Inventors: Dan GROBNIC, Stephen J. MIHAILOV, Robert B. WALKER, Ping LU, Huimin DING, David COULAS
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Patent number: 8402789Abstract: 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: GrantFiled: August 23, 2012Date of Patent: March 26, 2013Assignee: Her Majesty the Queen in Right of Canada, as Represented by the Minister of Industry, Through the Communications Research Centre CanadaInventors: Christopher W. Smelser, Stephen J. Mihailov, Dan Grobnic, Ping Lu, Robert B. Walker, Gino Cuglietta, Huimin Ding, Xiaoli Dai
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Publication number: 20120324959Abstract: 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: ApplicationFiled: August 23, 2012Publication date: December 27, 2012Applicants: the Communications Research Centre CanadaInventors: Christopher W. Smelser, Stephen J. Mihailov, Dan Grobnic, Ping Lu, Robert B. Walker, Gino Cuglietta, Huimin Ding, Xiaoli Dai
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Patent number: 8272236Abstract: A method of producing a thermally stable grating allows the grating to be placed in environments where temperatures reach 1000° C. and where the grating is relatively stable and has very low loss from scatter. These gratings have spectral characteristics that allow them to 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.Type: GrantFiled: June 18, 2009Date of Patent: September 25, 2012Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of Industry, through the Communications Research Centre CanadaInventors: Christopher W. Smelser, Stephen J. Mihailov, Dan Grobnic, Ping Lu, Robert B. Walker, Gino Cuglietta, Haimin Ding, Xiaoli Dai
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Patent number: 7689087Abstract: 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: GrantFiled: July 9, 2008Date of Patent: March 30, 2010Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of Industry, Through the Communications Research Centre CanadaInventors: Stephen J. Mihailov, Dan Grobnic, Christopher W. Smelser, Robert B. Walker, Ping Lu, Xiaoli Dai, Huimin Ding, Gino Cuglietta
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Publication number: 20090317928Abstract: A method of producing a thermally stable grating allows the grating to be placed in environments where temperatures reach 1000° C. and where the grating is relatively stable and has very low loss from scatter. These gratings have spectral characteristics that allow them to 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.Type: ApplicationFiled: June 18, 2009Publication date: December 24, 2009Inventors: Christopher W. Smelser, Stephen J. Mihailov, Dan Grobnic, Ping Lu, Robert B. Walker, Gino Cuglietta, Haimin Ding, Xiaoli Dai
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Patent number: 7567734Abstract: An optical sensor for sensing information relating to an analyte liquid or gas, has a a planar substrate having a refractive index nc. The planar substrate supports a ridge waveguide having an unclad top portion having a refractive index nr. The substrate serves as cladding layer for the ridge waveguide at a location where the ridge waveguide contacts the substrate. A Bragg grating inscribed in the ridge waveguide has two modes for providing information relating to both temperature and refractive index of the surrounding analyte liquid or gas. A cladding mode has a different response to the analyte when compared to a Bragg resonance response. Both modes have a same reaction to temperature, wherein said Bragg grating is formed within the unclad region of ridge waveguide, wherein nc.<nr. Advantageously multiple parameters can be sensed using only a single Bragg grating.Type: GrantFiled: August 8, 2008Date of Patent: July 28, 2009Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of Industry, through the Communications Research Centre CanadaInventors: Xiaoli Dai, Stephen J. Mihailov, Robert B. Walker, Chantal Blanchetiere, Claire Callender, Huimin Ding, Ping Lu, Dan Grobnic, Christopher W. Smelser, Gino Cuglietta