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US 2017/0101335 A1Published application
Method to prevent cracks in optical fiber preforms
AssigneeCorning Incorporated
InventorsPaul Andrew Chludzinski, Dominick Fiordimalva
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AssigneeCorning Incorporated
InventorsPaul Andrew Chludzinski, Dominick Fiordimalva
Estimating the term…
The present disclosure provides optical fiber preforms formed from core canes having large core-clad ratio, intermediate core-cladding assemblies, and methods for making the preforms and core cladding assemblies. The preforms are made with capped core canes. The capping material has a coefficient of thermal expansion less than the coefficient of thermal expansion of the core cane and more closely matched to or lower than the coefficient of thermal expansion of the surrounding cladding monolith in a cane-in-soot process. Presence of the cap reduces stresses that arise from differential thermal expansion of the core cane and cladding materials and leads to preforms having low defect concentration and low probability of failure during subsequent thermal processing steps.
A core-cladding assembly comprising:
An optical fiber preform comprising a capped core cane surrounded by a cladding, said capped core cane comprising a first cap in contact with a first end surface of a core cane, said core cane comprising doped silica and having a core-clad ratio of at least 0.7, said preform including a corner region, said corner region including an interface between said capped core cane, said cladding, and a gas, said corner region having radial tensile stresses of less than 100 MPa.
A method of producing an optical fiber comprising:
A method of producing an optical fiber comprising:
Dependencies are inferred from the claim text.