Ultralow-attenuation large-effective-area single-mode optical fiber

Abstract

The invention relates to an ultralow-attenuation large-effective-area single-mode optical fiber. The optical fiber comprises a core layer and a cladding layer, the cable is characterized in that the radius r1 of the core layer is 8-10 [mu] m; the relative refractive index delta n1 of the core layer is-0.10% to 0.20%; the core layer is sequentially coated with an inner cladding layer, a sunken inner cladding layer and an outer cladding layer from inside to outside; the radius r2 of the inner cladding is 11-15 [mu] m; wherein the radius r3 of the sunken inner cladding ranges from 16 microns to 50 microns, the relative refractive index delta n3 of the sunken inner cladding ranges from-0.30% to-0.70%, the outer cladding is a full fluorine-doped silicon dioxide glass layer, and the relative refractive index delta n4 of the sunken inner cladding ranges from-0.15% to-0.60%. According to the specific viscosity matching design, the core layer is a non-pure silicon core and has the characteristic of co-doping of germanium and fluorine, and meanwhile, a chlorine doping process is carried out, so that the viscosity of the optical fiber is reduced, the structural relaxation of glass is accelerated, the viscosity of each part of the optical fiber and the stress of the optical fiber are optimized, and the single-mode optical fiber performance with large effective area and ultralow attenuationis realized.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a single-mode optical fiber with ultra-low attenuation and large effective area. Background technique [0002] At present, the hot spot in the field of optical fiber manufacturing is the preparation of large effective area single-mode optical fiber products, so finding an effective method to reduce the attenuation coefficient of optical fiber and control manufacturing costs is a huge challenge 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 optical fiber; second, while obtaining an ultra-low attenuation coefficient, it is necessary to ensure that the optical parameters of the optical fiber meet the requirements of the ITU-T The standard mainly refers to the control of MFD, dispersion, cut-off wavelength a...

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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