Penetration assembly for bringing an optical fiber cable through

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Details

350 9621, G02B 716

Patent

active

045538123

ABSTRACT:
A penetration assembly for an optical fiber cable includes a pair of axially-aligned cylindrical sleeves surrounding an optical fiber cable. An air-tight seal is formed between the optical fiber cable and the sleeves by means of glass connectors connected to the optical fiber cable and flexible metal connectors connected between the glass connectors and the inside of the sleeves. Each glass connector comprises a plurality of cylindrical sections each having a different coefficient of thermal expansion having a value between that of the optical fiber cable and that of the flexible metal connector. The coefficient of thermal expansion of the glass connector changes in a step-wise manner from the section connected to the optical fiber cable to the section connected to the flexible metal connector. This step-wise change in coefficient of thermal expansion reduces the thermal stresses exerted on each section and prevents cracks due to thermal stress, a common problem with the resinous materials presently used to form air-tight seals in penetration assemblies. Since the air-tight seal between the optical fiber cable and the sleeves is formed from glass and metal, it is more resistant to radiation than presently used seals formed from resinous materials.

REFERENCES:
patent: 3946467 (1976-03-01), Lukas et al.
patent: 4124364 (1978-11-01), Dalgoutte
patent: 4379614 (1983-04-01), Liertz

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