Drawing method of optical fiber and drawing furnace

Details Drawing method of optical fiber and drawing furnace Drawing method of optical fiber and drawing furnace

2005-06-21

2005-06-21

Hug, Eric (Department: 1731)

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

Process of manufacturing optical fibers, waveguides, or...

C065S435000, C065S537000, C065S382000, C065S491000

Reexamination Certificate

active

06907757

ABSTRACT:
The drawing method of the present invention uses a drawing furnace comprising a furnace muffle tube, a furnace body and a heater. According to the method, an optical fiber preform is inserted from the inlet of the furnace muffle tube, the optical fiber preform is melted by means of a heater, under a specified gas atmosphere, and is drawn toward the outlet of the furnace muffle tube by means of a specified drawing tension. The optical fiber preform and the drawing furnace used in this method both satisfy the condition of below-indicated formula (1):in-line-formulae description="In-line Formulae" end="lead"?L/D≧8  (1)in-line-formulae description="In-line Formulae" end="tail"?wherein L indicates the length of the furnace body in the drawing direction and D indicates the diameter of the optical fiber preform. Through this method, even for the case of drawing optical fibers having a large relative index difference between the central core and the cladding, optical fibers wherein residual amounts of lattice defects are sufficiently reduced and degradation of characteristics under a hydrogen atmosphere is sufficiently suppressed can be obtained efficiently and at low cost.

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