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US 12,291,477 B2Granted
Method and device for manufacturing an optical fibre
AssigneesUniversite De Limoges, Centre National De La Recherche Scientifique
InventorFetah Benabid
Life of this patent
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Abstract
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, and at least one laser beam is applied to a working zone of the drawn preform, each laser beam being power-modulated according to a modulation frequency. A device for manufacturing an optical fibre is also provided.
Claims26
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.
6 more elements
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
- wherein the furnace comprises:
- an enclosure through which the preform passes, and
- a heat source arranged in the enclosure and raising the temperature inside the enclosure, the working zone being situated at a distance less than 10 cm from the heat source.
8 more elements
A device for manufacturing an optical fibre, comprising:
- a furnace;
- an inlet for inserting a preform into the furnace;
- means for drawing the preform via an outlet of the furnace;
- and
- emission means arranged to apply to a working zone of the thus-drawn preform, at least one laser beam, and modulation means arranged to power-modulate each laser beam according to a modulation frequency;
- the modulation frequency being greater than 10 Hz and less than 1000 kHz;
- the emission means being arranged so that each laser beam has a power greater than 10 W;
- the emission means and the furnace being arranged so that the working zone is at a temperature above a softening or vitreous transition temperature of a material constituting the preform;
- the emission means being arranged so that a part of the wavefront of each laser beam coming into contact with the working zone has, at each given instant, a spatial power density comprised between a maximum and 80% of this maximum;
- and
- wherein the furnace comprises:
- an enclosure through which the preform passes, and
- a heat source arranged in the enclosure and raising the temperature inside the enclosure, the working zone being situated at a distance less than 10 cm from the heat source.
10 more elements
Dependencies are inferred from the claim text.