초록 ▼

A glass optical waveguide filament preform is prepared by chemical reaction of vapor ingredients within a glass bait tube. As the reactants flow through the bait tube, a hot zone traverses the tube to cause the deposition of sooty reaction products in the region immediately downstream of the hot zon

A glass optical waveguide filament preform is prepared by chemical reaction of vapor ingredients within a glass bait tube. As the reactants flow through the bait tube, a hot zone traverses the tube to cause the deposition of sooty reaction products in the region immediately downstream of the hot zone. A baffle tube extends into that end of the bait tube into which the reactants flow. The baffle tube, which traverses the bait tube along with the burner, ends just short of the hot zone so that no soot is deposited thereon. A gas flowing from the baffle tube creates a gaseous mandrel which confines the flow of reactant vapors to an annular channel adjacent the bait tube wall in the hot zone, thereby increasing deposition rate and efficiency.

대표청구항 ▼

In a method of manufacturing an optical device, said method being of the type that includes the steps of flowing a vapor mixture including at least one compound, glass-forming precursor, together with an oxidizing medium, through a hollow, cylindrical substrate, and heating said substrate and contai

In a method of manufacturing an optical device, said method being of the type that includes the steps of flowing a vapor mixture including at least one compound, glass-forming precursor, together with an oxidizing medium, through a hollow, cylindrical substrate, and heating said substrate and contained vapor mixture with a heat source that moves relative to said substrate in a longitudinal direction, whereby a moving hot zone is established within said substrate, such that a suspension of particulate material is produced, at least a portion of said particulate material traveling downstream where at least a portion thereof comes to rest on the inner surface of said substrate to form a deposit on said inner surface, the improvement which comprises flowing an unconfined stream of gas through the axial region of said substrate in the hot zone thereof so that said stream is the sole mechanism that acts to confine the flow of said vapor mixture to an annular channel adjacent the substrate surface, whereby the deposition efficiency of the reaction of said vapor mixture is increased.