Experimental study on reliability and stress-free aging effects on hermetically coated fibers

Jon Steinar Andreassen

doi:10.1117/12.187420

28 September 1994 Experimental study on reliability and stress-free aging effects on hermetically coated fibers

Jon Steinar Andreassen

Proceedings Volume 2290, Fiber Optic Materials and Components; (1994) https://doi.org/10.1117/12.187420
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

Dynamic breaking strength measurements have been carried out on hermetically coated fibers taken out of a cable, after the cable was stored in water at 70 degree(s)C for 4 months. The cable was a slotted core construction, not including any metallic water barrier. More than 200 specimens with a gauge length of 9.5 m have been tested, so that the effective length of fiber tested is in excess of 2 km. The reference for this test was measurements on a similar population on as-received fiber. Tensile strength measurements have also been performed on non cabled fibers stored in water at 70 degree(s)C. Here, fiber specimens have been tested periodically within a period of 6 months. The experiments reported show that the hermetically coated fiber will maintain its good mechanical properties. Pit formation and strength reduction due to stress free ageing, as reported for standard coated fibers, have not been observed for cabled hermetically coated fibers after being aged 4 months in water at 70 degree(s)C nor bare fibers stored 6 months in water at the same temperature. The hermetic coating thus protects the silica glass surface against the environment, and no corrosive chemical interaction between coating and glass surface occur.

Citation Download Citation

Jon Steinar Andreassen "Experimental study on reliability and stress-free aging effects on hermetically coated fibers", Proc. SPIE 2290, Fiber Optic Materials and Components, (28 September 1994); https://doi.org/10.1117/12.187420

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