Patents by Inventor Yaowen Li

Yaowen Li 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: 20190234832
    Abstract: Aspects of the present disclosure describe a multilayer coding method for physical value measurements in which a multi-pulse pattern is generated through several layers, each of which is encoded with a different cyclic codeword. The total coding gain is the product of the gains of each layer advantageously allowing a long cyclic codeword to be replaced by combining several short cyclic codewords. Of particular advantage, methods according to the present disclosure provide better signal-to-noise characteristics, longer sensing distances and lower computational complexity particularly suitable for high-performance and cost-effective distributed optical fiber sensing (DOFS).
    Type: Application
    Filed: January 26, 2019
    Publication date: August 1, 2019
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Yaowen Li, Jian Fang, Ting Wang
  • Publication number: 20190234809
    Abstract: Aspects of the present disclosure describe Raman based Distributed temperature sensing (DTS) systems with a novel recovery algorithm that improves the spatial resolution of DTS system. The algorithm is based on a linear DTS model and weighted total variation.
    Type: Application
    Filed: January 26, 2019
    Publication date: August 1, 2019
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Yaowen LI, Jiaming LIANG
  • Publication number: 20180044234
    Abstract: A technique is described for fabricating one or more optical devices in a carbon-coated optical fiber. A photosensitive optical fiber is provided having a hermetic carbon coating. Further provided is a laser having a beam output that is configured to inscribe one or more refractive index modulations into the optical fiber through the hermetic carbon layer while leaving the hermetic carbon layer intact. The laser is used to inscribe one or more optical devices into the optical fiber through the hermetic carbon layer.
    Type: Application
    Filed: October 20, 2017
    Publication date: February 15, 2018
    Applicant: OFS Fitel, LLC
    Inventors: Adam Hokansson, David J. Kudelko, Yaowen Li, Joanna Y. Ng, Debra A. Simoff
  • Patent number: 9822035
    Abstract: A technique is described for fabricating one or more optical devices in a carbon-coated optical fiber. A photosensitive optical fiber is provided having a hermetic carbon coating. Further provided is a laser having a beam output that is configured to inscribe one or more refractive index modulations into the optical fiber through the hermetic carbon layer while leaving the hermetic carbon layer intact. The laser is used to inscribe one or more optical devices into the optical fiber through the hermetic carbon layer.
    Type: Grant
    Filed: May 2, 2016
    Date of Patent: November 21, 2017
    Assignee: OFS FITEL, LLC
    Inventors: Adam Hokansson, David J Kudelko, Yaowen Li, Joanna Y Ng, Debra A Simoff
  • Patent number: 9759585
    Abstract: In a TDM- and WDM-based FBG sensor array system, a source emits a light covering a selected wavelength range. The light is amplified and then used to generate a series of pulses that are fed into an array of sensor gratings. The propagation of a pulse through the sensor array results in a time-domain-multiplexed output, comprising a series of output pulses in which each output pulse comprises a reflection of the input pulse at a respective grating in the sensor array. Raman amplification is used to amplify both the pulse input into and the time-domain multiplexed output from the sensor array, which is then coupled into an output processing stage for receiving the sensor output and for reconstructing the wavelength output of each grating in the sensor array. The wavelength change for each grating is then used to calculate a physical parameter(s) to be measured, such as temperature and/or strain.
    Type: Grant
    Filed: March 4, 2013
    Date of Patent: September 12, 2017
    Assignee: OFS FITEL, LLC
    Inventors: William R Holland, Yaowen Li, Jeffrey W Nicholson, Yingzhi Sun, Benyuan Zhu
  • Publication number: 20170204290
    Abstract: Disclosed herein is a coating composition comprising a silsesquioxane component having one or more reactive functional groups that render it curable using ultraviolet radiation; where the one or more reactive functional groups are selected from the group consisting of an acrylate, a vinyl ether, or an epoxy; and optionally, a co-reactive non-silsesquioxane monomer and/or an oligomer having one or more reactive functional groups that are curable using ultraviolet radiation and are selected from the group consisting of free radically curable acrylates, cationically curable epoxies, and cationically curable vinyl ethers; where the coating composition is disposed and cured on an optical article; where the optical article is at least one of an optical fiber or an optical planar waveguide; and where the average functionality of the composition is greater than one.
    Type: Application
    Filed: July 28, 2015
    Publication date: July 20, 2017
    Applicant: OFS Fitel, LLC
    Inventors: Debra A Simoff, Kenneth S Feder, Yaowen Li, Jacob Wrubel, Kenichi Suyama, Mei Wen
  • Patent number: 9574950
    Abstract: An optical fiber-based sensor is described that is suitable for operation in a gas-rich environment. The sensor comprises a chamber into which are mounted one or more segments of optical fiber, into which are inscribed a plurality of sensor gratings. Each of the plurality of sensor gratings is configured to have the same wavelength shift over time in response to a change in gas diffusion, such that gas diffusion parameters are excluded in the determination of the respective amount of change in temperature, applied strain, and gas diffusion. Also described is a fiber, and techniques for making same, comprising of cores extend through a common cladding. The cores are doped so as to create, in conjunction with the cladding, a plurality of waveguides having the same wavelength shift over time is response to a change in gas diffusion, but different wavelength shifts in response to changes in other parameters.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: February 21, 2017
    Assignee: OFS FITEL, LLC
    Inventors: Matthew J Andrejco, David J Kudelko, Yaowen Li, Man F Yan
  • Publication number: 20170010411
    Abstract: An optical fiber having at least two polymer coatings, the optical fiber comprising: an optical fiber comprising a glass optical core and a glass cladding; a first polymer coating comprising a silicone polymer covering the optical fiber; and a second polymer coating covering the first polymer coating is provided.
    Type: Application
    Filed: March 30, 2016
    Publication date: January 12, 2017
    Applicant: OFS Fitel, LLC
    Inventors: Jie Li, Yaowen Li, Michael J. Hines, Brian Violette, Lei Huang, David Burgess
  • Publication number: 20160361779
    Abstract: A technique is described for fabricating one or more optical devices in a carbon-coated optical fiber. A photosensitive optical fiber is provided having a hermetic carbon coating. Further provided is a laser having a beam output that is configured to inscribe one or more refractive index modulations into the optical fiber through the hermetic carbon layer while leaving the hermetic carbon layer intact. The laser is used to inscribe one or more optical devices into the optical fiber through the hermetic carbon layer.
    Type: Application
    Filed: May 2, 2016
    Publication date: December 15, 2016
    Applicant: OFS Fitel, LLC
    Inventors: Adam Hokansson, David J. Kudelko, Yaowen Li, Joanna Y. Ng, Debra A. Simoff
  • Patent number: 9353001
    Abstract: A technique is described for fabricating one or more optical devices in a carbon-coated optical fiber. A photosensitive optical fiber is provided having a hermetic carbon coating. Further provided is a laser having a beam output that is configured to inscribe one or more refractive index modulations into the optical fiber through the hermetic carbon layer while leaving the hermetic carbon layer intact. The laser is used to inscribe one or more optical devices into the optical fiber through the hermetic carbon layer.
    Type: Grant
    Filed: January 31, 2014
    Date of Patent: May 31, 2016
    Assignee: OFS FITEL, LLC
    Inventors: Adam Hokansson, David J Kudelko, Yaowen Li, Joanna Y Ng, Debra A Simoff
  • Publication number: 20160011018
    Abstract: In a TDM- and WDM-based FBG sensor array system, a source emits a light covering a selected wavelength range. The light is amplified and then used to generate a series of pulses that are fed into an array of sensor gratings. The propagation of a pulse through the sensor array results in a time-domain-multiplexed output, comprising a series of output pulses in which each output pulse comprises a reflection of the input pulse at a respective grating in the sensor array. Raman amplification is used to amplify both the pulse input into and the time-domain multiplexed output from the sensor array, which is then coupled into an output processing stage for receiving the sensor output and for reconstructing the wavelength output of each grating in the sensor array. The wavelength change for each grating is then used to calculate a physical parameter(s) to be measured, such as temperature and/or strain.
    Type: Application
    Filed: March 4, 2013
    Publication date: January 14, 2016
    Inventors: William R Holland, Yaowen Li, Jeffrey W Nicholson, Yingzhi Sun, Benyuan Zhu
  • Publication number: 20150338286
    Abstract: An optical fiber-based sensor is described that is suitable for operation in a gas-rich environment. The sensor comprises a chamber into which are mounted one or more segments of optical fiber, into which are inscribed a plurality of sensor gratings. Each of the plurality of sensor gratings is configured to have the same wavelength shift over time in response to a change in gas diffusion, such that gas diffusion parameters are excluded in the determination of the respective amount of change in temperature, applied strain, and gas diffusion. Also described is a fiber, and techniques for making same, comprising of cores extend through a common cladding. The cores are doped so as to create, in conjunction with the cladding, a plurality of waveguides having the same wavelength shift over time is response to a change in gas diffusion, but different wavelength shifts in response to changes in other parameters.
    Type: Application
    Filed: March 7, 2013
    Publication date: November 26, 2015
    Inventors: Matthew J Andrejco, David J Kudelko, Yaowen Li, Man F Yan
  • Publication number: 20150285993
    Abstract: A technique is described for fabricating one or more optical devices in a carbon-coated optical fiber. A photosensitive optical fiber is provided having a hermetic carbon coating. Further provided is a laser having a beam output that is configured to inscribe one or more refractive index modulations into the optical fiber through the hermetic carbon layer while leaving the hermetic carbon layer intact. The laser is used to inscribe one or more optical devices into the optical fiber through the hermetic carbon layer.
    Type: Application
    Filed: January 31, 2014
    Publication date: October 8, 2015
    Applicant: OFS FITEL, LLC
    Inventors: Adam Hokansson, David J Kudelko, Yaowen Li, Joanna Y Ng, Debra A Simoff
  • Patent number: 8380019
    Abstract: In a method and system for providing dispersion compensation in an optical system, there is coupled into the optical system at least one pathway into which there is connected a tunable chirped fiber Bragg grating, each such grating providing a respective tunable amount of dispersion. At least one respective DGD element is connected into the respective pathway for each such grating. The set of all such respective DGD elements in a given pathway introduces a bias differential group delay DGD(bias) having an absolute value that, for at least one tuning value of the grating, is substantially equal to differential group delay introduced by the grating.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: February 19, 2013
    Assignee: OFS Fitel, LLC
    Inventors: Gregory M. Bubel, William R. Holland, David J. Kudelko, Yaowen Li, Paul S. Westbrook
  • Patent number: 8135490
    Abstract: A technique is described for reducing group delay ripple in a fiber dispersion compensation grating. The grating is mounted into a trimming setup that includes a trimming device and a scanning assembly for causing a region of the grating to be scanned along its length by the trimming device output. The grating is sensitive to the trimming device output, such that exposure to the trimming device output causes a change in the effective refractive index of the scanned region, the amount of change varying as a function of scanning velocity. A region of the grating to be trimmed is selected, and a scanning velocity profile is programmed into the scanning assembly that is calculated to modify the effective refractive index of the selected grating region along its length so as to smooth out group delay ripple in the selected grating region.
    Type: Grant
    Filed: February 22, 2009
    Date of Patent: March 13, 2012
    Assignee: OFS Fitel, LLC
    Inventors: Yaowen Li, Gary C. Hancsin, Carl E. Soccolich
  • Patent number: 8123400
    Abstract: A twin core fiber for sensor applications is developed. It is particularly useful in de-coupling the strain and temperature and thus obtaining both measurement parameters at the same time and location. It is also particularly useful for measuring the temperature in a high humidity environment. The twin core fiber has two cores and each of the cores having a different dopant regime. Also, each of the cores includes a grating having substantially the same grating period.
    Type: Grant
    Filed: February 17, 2009
    Date of Patent: February 28, 2012
    Assignee: OFS Fitel, LLC
    Inventors: Matthew J Andrejco, Gregory M Bubel, David J Kudelko, Yaowen Li, Man F Yan
  • Publication number: 20110110619
    Abstract: In a method and system for providing dispersion compensation in an optical system, there is coupled into the optical system at least one pathway into which there is connected a tunable chirped fiber Bragg grating, each such grating providing a respective tunable amount of dispersion. At least one respective DGD element is connected into the respective pathway for each such grating. The set of all such respective DGD elements in a given pathway introduces a bias differential group delay DGD(bias) having an absolute value that, for at least one tuning value of the grating, is substantially equal to differential group delay introduced by the grating.
    Type: Application
    Filed: November 8, 2010
    Publication date: May 12, 2011
    Applicant: OFS Fitel, LLC
    Inventors: Gregory M. Bubel, William R. Holland, David J. Kudelko, Yaowen Li, Paul S. Westbrook
  • Patent number: 7831114
    Abstract: In a method and system for providing dispersion compensation in an optical system, there is coupled into the optical system at least one pathway into which there is connected a tunable chirped fiber Bragg grating, each such grating providing a respective tunable amount of dispersion. At least one respective DGD element is connected into the respective pathway for each such grating. The set of all such respective DGD elements in a given pathway introduces a bias differential group delay DGD(bias) having an absolute value that, for at least one tuning value of the grating, is substantially equal to differential group delay introduced by the grating.
    Type: Grant
    Filed: January 11, 2009
    Date of Patent: November 9, 2010
    Assignee: OFS Fitel LLC
    Inventors: Gregory M. Bubel, William R. Holland, David J. Kudelko, Yaowen Li, Paul S. Westbrook
  • Publication number: 20090262779
    Abstract: A twin core fiber for sensor applications is developed. It is particularly useful in de-coupling the strain and temperature and thus obtaining both measurement parameters at the same time and location. It is also particularly useful for measuring the temperature in a high humidity environment. The twin core fiber has two cores and each of the cores having a different dopant regime. Also, each of the cores includes a grating having substantially the same grating period.
    Type: Application
    Filed: February 17, 2009
    Publication date: October 22, 2009
    Applicant: OFS Fitel, LLC
    Inventors: Matthew J. Andrejco, Gregory M. Bubel, David J. Kudelko, Yaowen Li, Man F. Yan
  • Publication number: 20090230580
    Abstract: A technique is described for reducing group delay ripple in a fiber dispersion compensation grating. The grating is mounted into a trimming setup that includes a trimming device and a scanning assembly for causing a region of the grating to be scanned along its length by the trimming device output. The grating is sensitive to the trimming device output, such that exposure to the trimming device output causes a change in the effective refractive index of the scanned region, the amount of change varying as a function of scanning velocity. A region of the grating to be trimmed is selected, and a scanning velocity profile is programmed into the scanning assembly that is calculated to modify the effective refractive index of the selected grating region along its length so as to smooth out group delay ripple in the selected grating region.
    Type: Application
    Filed: February 22, 2009
    Publication date: September 17, 2009
    Applicant: OFS FITEL, LLC
    Inventors: Yaowen Li, Gary C. Hancsin, Carl E. Soccolich