C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
49/8
C03B 37/075 (2006.01) C03B 37/012 (2006.01) C03B 37/027 (2006.01) C03B 37/03 (2006.01) C03C 15/00 (2006.01) C03C 23/00 (2006.01)
Patent
CA 1131029
ABSTRACT OF THE DISCLOSURE An improved method of preparing optical fiber preforms and optical fibers by so called rod-in-tube method, wherein before collapsing a tube to heat-adhere to a rod, a specific glass surface treating agent and oxygen gas are flowed through the clearance between the rod and the tube maintained at a high temperature, whereby an optical fiber preform free from imperfections at the interface between the rod and the tube can be produced so as to give optical fibers of low-loss. As the above glass surface treating agent, those materials are employed which satisfy the following criteria: (i) the hydrogen content thereof being not more than about 1 % by weight, and (ii) the substances, produced therefrom in the presence of oxygen gas at a high temperature, having a boiling point or sublimation point of not more than the temperature required for collapsing the tube.
339909
Kobayashi Ryuji
Shintani Takeshi
Sukawa Tadaaki
Utsumi Atsushi
Dainichi-Nippon Cables Ltd.
Mitsubishi Metal Corporation
Osler Hoskin & Harcourt Llp
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