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1. (WO2017203193) OPTICAL FIBRE AND OPTICAL FIBRE DEVICE

Pub. No.:    WO/2017/203193    International Application No.:    PCT/GB2017/000082
Publication Date: Fri Dec 01 00:59:59 CET 2017 International Filing Date: Thu May 25 01:59:59 CEST 2017
IPC: G02B 6/255
Applicants: SPI LASERS UK LIMITED
Inventors: GHIRINGHELLI, Fabio
ZERVAS, Mikhail, Nickolaos
SHAW, Julia, Helen
MARSHALL, Andrew
Title: OPTICAL FIBRE AND OPTICAL FIBRE DEVICE
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.