Methods and apparatus for producing optical fiber

Details Methods and apparatus for producing optical fiber Methods and apparatus for producing optical fiber

C - Chemistry, Metallurgy

03

B

C03B 37/027 (2006.01) C03B 23/047 (2006.01) C03B 37/012 (2006.01) C03B 37/026 (2006.01) G02B 6/02 (2006.01)

Patent

CA 2341713

Filament in tube and stick in tube processes of forming optical fiber are described. A solid or monolithic core feedstock (110) is disposed in a hollow cladding structure (112) to form a loosely filled cladding structure. The filled cladding structure is heated to a draw temperature approximately equal to the softening temperature of the cladding structure. The feedstock (110) melts and fills the heated portion of the cladding structure forming a filled core which can then be drawn into optical fiber or to an optical can which can then be further overclad consolidated and drawn into fiber. Feedstock (110) and cladding structures (112) having widely varying coefficients of expansion may be employed. The resulting fiber can be readily designed to be fused to existing installed fibers.

L'invention concerne des procédés de fabrication de fibre optique selon les techniques filament-tube et bâton-tube. On dispose, dans une gaine creuse (112), une matière solide ou monolithique (110) constituant l'âme, de façon à former une gaine remplie de façon non compacte. On chauffe cette gaine ainsi remplie à une température d'étirage à peu près égale à la température de ramollissement de la gaine. La matière (110) fond et remplit la partie chauffée de la gaine, formant ainsi une âme remplie qui peut ensuite être étirée jusqu'à former une fibre optique ou une tige optique pouvant être consolidée par une nouvelle gaine et étirée jusqu'à former une fibre. Il est possible d'utiliser des matières (110) et des gaines (112) présentant des coefficients d'expansion très variables. Eventuellement, la fibre obtenue est facilement fondue à des fibres déjà installées.

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