Low-temperature-resistant non-sensitive single-mode fiber

Abstract

The invention relates to a low-temperature-resistant non-sensitive single-mode fiber comprising a glass part and two high-molecular polymer protective coating layers coating the glass part. The glass part consists of a core layer, an inner cladding, a recessed outer cladding, and an outer cladding; the core layer and the inner cladding are germanium-and-fluorine-doped quartz glass parts; an F-doped relative refraction index contribution value deltaF-core of the core layer is -0.04 to -0.10% and a Ge-doped relative refraction index contribution value deltaGe-core of the core layer is 0.35 to 0.48%; an F-doped relative refraction index contribution value deltaF-inner clad of the inner cladding is -0.10 to -0.24% and a Ge-doped relative refraction index contribution value deltaGe-inner clad of the inner cladding is 0.05 to 0.20%, and the |deltaF-inner clad| is larger than or equal to deltaGe-inner clad; an F-doped relative refraction index contribution value deltaF-trench of the recessed outer cladding is -0.20 to -0.35%; and the F-doped relative refraction index contribution values of the core layer, the inner cladding, and the recessed outer cladding form the following a relationship: |deltaF-Trench| is larger than or equal to the sum of the |deltaF-core| and the |deltaF-inner clad|, wherein the product of the |deltaF-core| and 1.5 is less than or equal to the |deltaF-inner clad|. Because the composition of materials of the fiber glass part and the composition of the cured coating materials, the micro bending-resistant performance of the fiber is enhanced and the attenuation performance and stability of the fiber at a low temperature are improved.

Description

technical field [0001] The invention relates to a bend-insensitive single-mode optical fiber used in an access network. The optical fiber has better attenuation stability under low temperature conditions and belongs to the field of optical fiber communication. Background technique [0002] With the continuous development of optical fiber transmission technology, fiber-to-the-home (FTTH) and fiber-to-the-desktop (FTTd) have become important development directions of communication access network construction. As the optical fiber for the transmission of coal, it plays a vital role. Considering that the winter temperature in Northeast and Northwest my country is relatively low, and it can reach -40°C or even lower under extreme temperature conditions. It can work normally, so there is an urgent need to develop a single-mode fiber that can be relatively stable in various fiber parameters under low temperature conditions. [0003] Under low temperature conditions, the most commo...

AI Technical Summary

Problems solved by technology

If the glass transition temperature of the inner layer is higher, when the temperature drops, the inner layer will easily enter the glass state, and the modulus will rise sharply, which will cause stress to the glass optical fiber, resulting in excessive attenuation

In addition, the increase of the modulus also weakens the absorption of the stress of the inner layer and the outer layer due to the decrease of the temperature and the increase of the modulus.

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