Why optical fiber aging?

Why optical fiber aging?

Optical fiber is often used in broadband, and it is faster than the speed of other hostages, then what is optical fiber? Simply put, the optical fiber is a communication cable, by two or more glass or plastic Optical fiber core, which is located in a protective coating, covered by a plastic PVC outer sleeve. Optical fiber will be aging? Will, it will slowly as people like factors and aging.
Optical fiber attenuation caused by factors such as scattering loss, absorption loss and microbend loss. The scattering loss is mainly caused by Rayleigh scattering, which is caused by the fluctuation of the microscopic refractive index caused by the irregular molecular structure of the glass, which is the inherent loss of the fiber and the lowest limit of the fiber attenuation. It is inversely proportional to λ4. At wavelengths less than 0.8 μm, Rayleigh scattering losses increase rapidly, limiting the use of fiber. The intrinsic absorption loss of the fiber matrix materials SiO2 and doped oxide molecules also causes the attenuation of the fiber to increase rapidly at wavelengths greater than 1.7 micrometers. Therefore, the use of such fiber wavelength is limited to 0.8 ~ 1.7 microns range. In this range, the attenuation is mainly included in the quartz glass impurity Fe +, Cu + and other transition metal ions and OH-. Of the absorption losses caused.
With the improvement of the purification process, the impurity absorption loss has been basically eliminated, so as to reach the limit of Rayleigh scattering loss. The irregular micro-bending of the fiber causes mode coupling, resulting in microbend loss, so the fiber should be avoided slightly bent during processing and use.

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