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:
May. 05, 2020
Filed:
May. 24, 2017
Spi Lasers Uk Limited, Hedge End, GB;
Fabio Ghiringhelli, Southampton, GB;
Mikhail Nickolaos Zervas, Southampton, GB;
Julia Helen Shaw, Bramshaw, GB;
Andrew Marshall, Andover, GB;
SPI Lasers UK Limited, Hedge End, GB;
Abstract
An optical fibre () which has a first refractive index profile () that can be changed by heating to a second refractive index profile (), at least one first dopant () for providing the first refractive index profile, at least one concealed dopant (), and at least one mobile dopant (), wherein the mobile dopant has a molar refractivity and is present in a concentration () such as to balance a change () in the first refractive index profile induced by the concealed dopant, and has a diffusion constant () greater than a diffusion constant () 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.