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Hermetic coatings

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Abstract

Today optical fiber is used in many diverse applications. Some of these applications require that fibers be exposed to high stress for extended periods of time. The fiber strength decreases with time in the presence of moisture and tensile stresses of sufficient severity, otherwise known as fatigue.1 Also, some of these applications require that fiber be exposed to hydrogen gas, which can cause the attenuation of optical fibers to increase.2 One approach to improve the resistance of optical fibers to fatigue and hydrogen- induced increases in attenuation is the use of a hermetic barrier to limit the diffusion of water and hydrogen from the environment to the silica fiber. Coating the optical fiber with a hermetic barrier has been investigated extensively by several laboratories, and significant progress has been made over the past few years. Many materials have been reported in the literature, and some have achieved significantly improved fatigue and hydrogen resistance results.

© 1990 Optical Society of America

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