July 2, 2019
First, when the fatigue parameter N is certain, the life of the fiber is only related to the stress σ inherited. Therefore, reducing the stress sustained by the fiber is a way to increase the service life of the fiber. When people make optical fibers, a compressive stress is formed on the surface of the optical fiber to counter the inherited tension stress, so that the tension stress is reduced to the minimum extent possible, and a compressive stress cladding technique is generated to make optical fibers.
If the stress of the optical fiber is σ a and the lifetime is T1, when the optical fiber has a compressive stress σ R envelope, the optical fiber's lifetime is T2: T2 = T1[ (σ a-σ R) / σ a] -N, where(σ a-σ R) is the net stress that the fiber is truly subjected to. The results show that the life of fiber with compressive stress cladding is much longer than that of normal fiber. In recent years, some people have used GeO2 quartz as a compression layer on the optical fiber surface, and others have used TiO2 quartz as an outer layer of optical fiber to increase the tensile strength of the optical fiber itself from 50 kpsi to 130 kpsi(considerable tensile strength increased from 430 g to 1100 g). It also increases the static fatigue parameter of the fiber from N = 20 to 25 to N = 130.
Second, improve the static fatigue parameter N of fiber to improve the service life of fiber. Therefore, when making optical fibers, people try to isolate the quartz fiber itself from the atmosphere environment, so that it is not affected by the atmosphere environment, and as far as possible, the N value is changed from the environmental material parameter to the parameter of the optical fiber material itself. The N value can be made very large, resulting in a "sealed cover technology" on the surface of the fiber.
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