A single-mode optical fiber with ultra-low attenuation and large effective area

Abstract

The invention relates to an ultralow-attenuation and large-effective-area single-mode optical fiber. The ultralow-attenuation and large-effective-area single-mode optical fiber comprises a core layer and covering layers, and is characterized in that the radius r1 of the core layer is 5mum to 8mum; the relative refractive index deltan1 of the core layer is 0 to 0.20 percent; an inner covering layer, a concave inner covering layer and an outer covering layer covers the core layer in sequence from outside to inside; the radius r2 of the inner covering layer is 8.5 to 12 mum and the relative refractive index deltan2 of the inner covering layer is smaller than or equal to 0.20 percent; the radius r3 of the concave inner covering layer is 12.5mum to 30mum and the relative refractive index deltan3 of the concave inner covering layer is smaller than or equal to 0.40 percent; the outer covering layer is a full fluorine-doped silicon dioxide glass layer and the relative refractive index deltan4 of the outer covering layer is smaller than or equal to 0.20 percent. By reasonably designing a waveguide structure and a material component of the core covering layer, viscosity matching and optical fiber stress of each part of the optical fiber are optimized, and an ultralow-attenuation performance of the single-mode optical fiber is realized. A fluorine-doped silicon dioxide outer covering layer structure is utilized, and material relaxation time of each part of an optical fiber material is changed, so that virtual temperature of the optical fiber is changed, an optical fiber section is simplified and stable control of optical fiber parameters is realized.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to an ultra-low attenuation large effective area single-mode optical fiber and a preparation method thereof. Background technique [0002] At present, the hot spot in the field of optical fiber manufacturing is the preparation of ultra-low attenuation new single-mode optical fiber products, so reducing the optical fiber attenuation coefficient and controlling the manufacturing cost are very big challenges for optical fiber manufacturing enterprises. The main difficulty lies in the following three points: First, how to reduce the attenuation: the main method at present is to reduce the Rayleigh scattering coefficient of the fiber; second, while obtaining the ultra-low attenuation coefficient, it is necessary to ensure that the optical parameters of the fiber meet the requirements of ITU-T Standard, mainly refers to MFD, dispersion, cut-off wavelength and bending performance are c...

AI Technical Summary

Problems solved by technology

The cross-sectional structure design and manufacturing process are quite complicated, and there are many factors that affect the fiber parameters, especially the dispersion of the fiber is difficult to control, and the fiber does not involve the dispersion coefficient of the fiber in each band and the microbending performance of the fiber

Due to the concept of double cladding, at the interface of pure silica cladding material and fluorine-doped cladding, in the process of wire drawing or preparation, it is inevitable to dope interface defects, which will affect the reduction of optical fiber attenuation performance

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