C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
49/8
C03B 37/018 (2006.01) C03B 37/012 (2006.01) C03B 37/014 (2006.01) C03C 13/04 (2006.01)
Patent
CA 1236695
OPTICAL FIBER Abstract of the Disclosure A tubular porous silica preform is made by depositing particulate silica on a mandrel From which the preform is subsequently removed. A second solid cylindrical porous silica preform is made by depositing particulate silica on an end surface of a support body. The porous preforms are then dried and the tubular preform is heated in a fluorine containing atmosphere to introduce a fluorine dopant into the silica. The rod preform is then placed inside the tubular preform and the two preforms are further dried in a chlorine atmosphere to remove residual moisture. The dual preforms are then heated in a zone sintering furnace to consolidate and collapse the porous material of the rod and tubular preforms into a transparent fused silica rod. The composite preform obtained is heated and dielectric optical waveguide drawn from it, the waveguide having a pure silica or doped silica core derived from the rod preform and a fluorine doped silica cladding derived from the tubular preform. - i -
463378
Abe Koichi
Mowle John E.
Northern Telecom Limited
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