US 12,291,477 B2
Method and device for manufacturing an optical fibre
Fetah Benabid, Le Palais-sur-Vienne (FR)
Assigned to UNIVERSITE DE LIMOGES, Limoges (FR); and CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR)
Appl. No. 17/593,219
Filed by UNIVERSITE DE LIMOGES, Limoges (FR); and CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR)
PCT Filed Mar. 5, 2020, PCT No. PCT/EP2020/055916
§ 371(c)(1), (2) Date Sep. 13, 2021,
PCT Pub. No. WO2020/187595, PCT Pub. Date Sep. 24, 2020.
Claims priority of application No. 1902656 (FR), filed on Mar. 15, 2019.
Prior Publication US 2022/0127183 A1, Apr. 28, 2022
Int. Cl. C03B 37/029 (2006.01); C03B 37/027 (2006.01)
CPC C03B 37/029 (2013.01) [C03B 37/027 (2013.01); C03B 2205/67 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A method for manufacturing an optical fibre, in which:
a preform is inserted into a furnace;
the preform is drawn via an outlet of the furnace;
at least one laser beam is applied to a working zone of the thus-drawn preform, each laser beam being power-modulated according to a modulation frequency;
the modulation frequency being greater than 10 Hz and less than 1000 kHz;
each laser beam having a power greater than 10 W;
the working zone being at a temperature above a softening or vitreous transition temperature of the material constituting the preform;
a part of the wavefront of each laser beam coming into contact with the working zone having, at each given instant, a spatial power density comprised between a maximum and 80% of this maximum; and
the working zone of the drawn preform comprises a structure composed of walls the thickness of which is less than 10 μm.