Apparatus and method for making optical fiber

Glass manufacturing – Processes of manufacturing fibers – filaments – or preforms – Process of manufacturing optical fibers – waveguides – or...

Reexamination Certificate

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C065S384000, C065S424000, C065S432000, C065S477000, C264S001240, C264S002600

Reexamination Certificate

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06851282

ABSTRACT:
A drawing apparatus1has a drawing furnace11, a heating furnace21, and a resin curing section31. The drawing furnace11has a muffle tube13to which an He gas supply passage15from an He gas supply section14is connected so as to supply He gas. The optical fiber3drawn upon heating by the drawing furnace11is fed to the heating furnace21, whereby a predetermined part of the optical fiber3is annealed at a predetermined cooling rate. The heating furnace21has a muffle tube23to which an N2gas supply passage25from an N2gas supply section24is connected so as to supply N2gas. Thereafter, the optical fiber3is coated with a UV resin39by a coating die38, and the UV resin39is cured in the resin curing section31, whereby a coated optical fiber4is formed.

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Shigeki Sakaguchi, “Relaxation of Rayleigh Scattering in Silica Core Optical Fiber with Heat Treatment”, NTT Photonics Laboratories, Japan, vol. J83-C, No. 1, pp. 30-36, 2000.

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