The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 10, 2024
Filed:
May. 13, 2020
Fiber bragg grating sensor in polymer-coated ultra-thin optical fibers and method for producing same
National Research Council of Canada, Ottawa, CA;
Cyril Hnatovsky, Ottawa, CA;
Nurmemet Abdukerim, Ottawa, CA;
Dan Grobnic, Ottawa, CA;
Stephen Mihailov, Ottawa, CA;
Rune Lausten, Ottawa, CA;
Ping Lu, Ottawa, CA;
Huimin Ding, Ottawa, CA;
David Coulas, Ottawa, CA;
Kasthuri De Silva, Ottawa, CA;
NATIONAL RESEARCH COUNCIL OF CANADA, Ottawa, CA;
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.