Strength degradation of optical glass fibers caused by static fatigue is an important factor deciding the long-term reliability of optical fibers. Many studies of the static fatigue of fibers have been made,1,2 but we have not seen any in the temperature range above 100°C. Recent expansion of optical fiber use requires reliability in a high-temperature atmosphere; for example, fibers in the optical-fiber-composite ground-wire may experience an ambient temperature above 100°C in summer.

© 1986 Optical Society of America

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