What affects the service life of optical fiber

I. What are the reasons affecting the service life of optical fiber? 1. The main reasons affecting the service life of optical fiber are: ①, unreasonable laying of optical fiber cable residual stress long-term action; ②, the existence of micro-cracks on the surface of the optical fiber and the expansion of; ③, the atmospheric environment, water and water vapor molecules on the surface of the optical fiber erosion and so on. Due to the above reasons, the mechanical strength of the quartz glass-based optical fiber is gradually reduced, and the attenuation slowly increases, causing the optical fiber to fracture and terminating the service life of the fiber optic cable. As there will always be microcracks on the surface of the fiber, slow crack growth occurs in the atmospheric environment, so that the cracks continue to expand, so that the mechanical strength of the optical fiber is gradually degraded. 2. There are two ways to improve the service life of optical fibers: Method 1, improve the static fatigue parameter n of optical fibers to improve the service life of optical fibers. Therefore, people in the manufacture of optical fibers, try to isolate the quartz fiber itself from the atmosphere, so that it is not affected by the atmosphere, as far as possible, the n value from the environmental material parameters into the parameters of the fiber optic material itself, you can make the n value becomes very large, which gives rise to the surface of the optical fiber, "sealing cladding technology". Method 2: When the fatigue parameter n is certain, the life time ts of the fiber is only related to the stress σ that it is subjected to, so reducing the stress that the fiber is subjected to is a way to improve the life time of the fiber. When one manufactures optical fibers, a compressive stress is formed on the surface of the fiber to counteract the tensile stress, so that the tensile stress is reduced to the smallest possible extent, resulting in the compressive stress cladding technology to manufacture optical fibers.

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