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28 September 1994 Hermetically coated fibers
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Abstract
The strength of flaw-free silica fibers in the absence of water is of the order of 12-14 GPa and is essentially independent of time. (Formula available in paper). On the other hand, in the presence of water, the time dependence is very much more serious (n - 20) and even at relatively short testing times (tf 10 secs), the measured strength is <6 GPa. The development of a completely satisfactory hermetic coating which will allow the realization of the above 'water-free' strengths is not simple, however, while the advantages of a polymer coating in mechanically protecting the fiber and at the same time isolating it from microbending losses is well-known, no water-impermeable viscoelast.ic coating has yet been proposed. Two other types of coatings have been proposed and each is successful to some extent as an hermetic coating. These materials and their behavior are quite different and will be described below.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Charles R. Kurkjian "Hermetically coated fibers", Proc. SPIE 2290, Fiber Optic Materials and Components, (28 September 1994); https://doi.org/10.1117/12.187421
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