C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
49/8
C03B 37/028 (2006.01) C03B 37/012 (2006.01)
Patent
CA 1206755
ABSTRACT OF THE DISCLOSURE In a method for producing an optical multiple fiber wherein a multiplicity of optical fibers are fused together with each other and each optical fiber comprises a core made of pure silica glass and a cladding layer made of a silica glass containing a dopant disposed on the core, by bundling a multiplicity of preforms corresponding to the optical fibers and drawing the bundle at a high temperature, an improvement which comprises using, as said optical fiber preforms, preforms having a three-layer construction wherein a support layer made of a silica glass having a drawable temperature of at least 1,800°C. is further disposed on the cladding layer, and drawing the bundle of the preforms to give a multiple fiber wherein the support layer of each optical fiber has a thickness of 0.01 to 1 µm, in order to produce a multiple fiber in which the cladding layer of each optical fiber has a sufficient thickness to fulfill the function as a cladding layer and which has an excellent image- transmitting capacity.
437246
Hayami Hiroyuki
Utsumi Atsushi
Dainichi-Nippon Cables Ltd.
Osler Hoskin & Harcourt Llp
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