Glass manufacturing – Processes – Forming product or preform from molten glass
65 311, 65DIG16, C03B 37018, C03B 37027
A tubular porous silica preform is made by depositing particulate silica on a mandrel from which the preform is subsequently removed. A 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.
patent: 4235615 (1980-11-01), Rau
patent: 4289517 (1981-09-01), Bailey
Suda et al; Electronics Letters (10/9/1980), vol. 16, No. 21, pp. 802-803.
Northern Telecom Limited
Schor Kenneth M.
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