Patents by Inventor Julia Helen SHAW

Julia Helen SHAW 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).

  • Optical fibre and optical fibre device
    Patent number: 10641961
    Abstract: An optical fibre (10) which has a first refractive index profile (61) that can be changed by heating to a second refractive index profile (62), at least one first dopant (7) for providing the first refractive index profile, at least one concealed dopant (8), and at least one mobile dopant (9), wherein the mobile dopant has a molar refractivity and is present in a concentration (19) such as to balance a change (146) in the first refractive index profile induced by the concealed dopant, and has a diffusion constant (16) greater than a diffusion constant (15) of the concealed dopant, so that heating of the optical fibre causes the mobile dopant to diffuse more quickly than the concealed dopant, thereby allowing the concealed dopant and the mobile dopant to change the first refractive index profile to the second refractive index profile.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: May 5, 2020
    Assignee: SPI Lasers UK Limited
    Inventors: Fabio Ghiringhelli, Mikhail Nickolaos Zervas, Julia Helen Shaw, Andrew Marshall
  • Optical Fibre And Optical Fibre Device
    Publication number: 20190196104
    Abstract: An optical fibre (10) which has a first refractive index profile (61) that can be changed by heating to a second refractive index profile (62), at least one first dopant (7) for providing the first refractive index profile, at least one concealed dopant (8), and at least one mobile dopant (9), wherein the mobile dopant has a molar refractivity and is present in a concentration (19) such as to balance a change (146) in the first refractive index profile induced by the concealed dopant, and has a diffusion constant (16) greater than a diffusion constant (15) of the concealed dopant, so that heating of the optical fibre causes the mobile dopant to diffuse more quickly than the concealed dopant, thereby allowing the concealed dopant and the mobile dopant to change the first refractive index profile to the second refractive index profile.
    Type: Application
    Filed: May 24, 2017
    Publication date: June 27, 2019
    Inventors: Fabio GHIRINGHELLI, Mikhail Nickolaos ZERVAS, Julia Helen SHAW, Andrew MARSHALL