Optical fiber preform and the method of producing the same

Details Optical fiber preform and the method of producing the same Optical fiber preform and the method of producing the same

2006-11-14

2006-11-14

McNeil, Jennifer C. (Department: 1775)

Stock material or miscellaneous articles

Article of intermediate shape

C428S210000, C428S213000, C428S220000

Reexamination Certificate

active

07135235

ABSTRACT:
An optical fiber preform (1) serving as a material of an optical fiber has a shoulder portion (12) thrusting beyond a middle portion (M) in a base end region (K) which is on the upper side when the optical fiber preform is suspended for a drawing process. The optical fiber preform (1) of this configuration can be easily produced by appropriately setting the heating condition, etc. for the sintering step in the production process. Thus, it is possible to omit the elongating step after the sintering step, thereby simplifying the production process. Further, in the prior-art technique, turbulence is generated in the gas flow in the furnace of the drawing apparatus toward the end of the drawing step, making it impossible to draw in a stable manner. In contrast, in this embodiment, due to the shoulder portion (12), there is a small gap between the inner wall surface of the furnace and the optical fiber preform; due to this small gap, the gas flow is regulated, and the drawing can be conducted in a stable manner even toward the end of the drawing step.

REFERENCES:
patent: 2002/0057879 (2002-05-01), Koumura et al.

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