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

Abstract

The invention relates to an ultra-low attenuation large effective area single-mode optical fiber, which includes a core layer and a cladding layer, and is characterized in that the radius r1 of the core layer is 8-10 μm, and the relative refractive index Δn1 of the core layer is -0.10-0.20 %, the core layer is covered with an inner cladding, a sunken inner cladding and an outer cladding sequentially from the inside to the outside, the inner cladding radius r2 is 11-15 μm, the relative refractive index Δn2 is -0.15--0.40%, and the sunken inner cladding The layer radius r3 is 16-50 μm, and the relative refractive index Δn3 is -0.30--0.70%. The outer cladding layer is a fully fluorine-doped silica glass layer, and the relative refractive index Δn4 is -0.15--0.60%. The unique viscosity matching design of the present invention: the core layer is an impure silicon core, which has the characteristics of germanium and fluorine co-doping. At the same time, the chlorine doping process is performed to reduce the viscosity of the optical fiber, accelerate the structural relaxation of the glass, and optimize the viscosity of each part of the optical fiber. Fiber stress for single-mode fiber performance with large effective area and ultra-low attenuation.

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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