Hermetically coated fibers

Charles R. Kurkjian

doi:10.1117/12.187421

28 September 1994 Hermetically coated fibers

Charles R. Kurkjian

Proceedings Volume 2290, Fiber Optic Materials and Components; (1994) https://doi.org/10.1117/12.187421
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

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.

Citation Download Citation

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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