Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1984-10-09
1986-04-01
Schor, Kenneth M.
Glass manufacturing
Processes
Forming product or preform from molten glass
65DIG16, C03B 37018
Patent
active
045795711
ABSTRACT:
A method for fabricating preforms for drawing into single mode optical fibers having core and cladding doped with different amounts fluorine. A pure fused silica start rod is first coated with a layer of soot which is then dehydrated, doped with a first level of fluorine, and then consolidated. This structure, which is an intermediate preform, is then drawn down until its area weighted average index of refraction is such that it would perform as a core in a fiber. If not, it is recoated and drawn down further until it will behave as a core upon further reduction in size. The intermediate preform is then recoated with another layer doped with a higher concentration of fluorine so that it will act as a cladding layer over the first fluorinated layer whose index is higher because of a lower concentration of fluorine. This final structure serves as a preform from which the desired fiber can be drawn.
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Proceedings of the Optical Fiber Conference, New Orleans, 1/1984; Abstracts MG4-MG6.
Caufield Francis J.
Polaroid Corporation
Schor Kenneth M.
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