Low-loss bending-resistant single-mode optical fiber

Abstract

The invention relates to a low-loss bending-resistant single-mode optical fiber, which comprises a core layer and a cladding layer, and is characterized in that the radius R1 of the core layer is 3-5 microns, the relative refractive index difference delta n1 is-0.1%-0.15%, the cladding layer is divided into an inner cladding layer and an outer cladding layer in sequence from inside to outside, the radius R2 of the inner cladding layer is 20-35 microns, the relative refractive index difference delta n2 is-0.42%--0.2%, and the outer cladding layer is divided into an outer cladding layer and an inner cladding layer from inside to outside. The radius R of the outer cladding layer is 62.5 microns, and the relative refractive index difference delta n3 is equal to-0.37% to-0.15%. A reasonable core layer waveguide structure and doping are arranged, the concentration factor and the Rayleigh scattering coefficient of the core layer are reduced, and the attenuation of the optical fiber is lower. The section and doping arrangement of the core cladding are reasonable, the viscosity matching of the optical fiber is further improved, the optical fiber can meet the requirement for low attenuation, can resist bending and is compatible with a conventional G.652. D optical fiber, high-speed wire drawing can be adopted, the production efficiency is improved, and therefore the manufacturing cost of the optical fiber is reduced.

Description

technical field [0001] The invention relates to a low-loss and bending-resistant single-mode optical fiber, which belongs to the technical field of optical communication transmission. Background technique [0002] Optical communication has the characteristics of large transmission capacity, long transmission distance, and fast transmission speed, and is widely used in optical communication systems such as long-distance trunk lines, metropolitan area networks, and access networks. In recent years, data traffic has increased sharply, and broadband has become an essential infrastructure. Network operators will increase their capital expenditures, implement network upgrades and deploy new equipment to meet this demand. At the same time, the central government has " "New infrastructure" has been raised to an unprecedented strategic height. In order to meet the requirements of long-distance transmission and reduce costs, higher and higher requirements are put forward for fiber at...

AI Technical Summary

Problems solved by technology

In order to obtain lower attenuation, in the preparation of optical fibers, it is necessary to consider that the viscosity and thermal expansion coefficient of different dopant materials in optical fibers are different, which will cause viscosity mismatch and increase attenuation. Viscosity mismatch will bring greater stress to the core layer of the optical fiber , making the attenuation increase

With the continuous development of FTTX in recent years, the performance of the original G.652 optical fiber has been difficult to meet user requirements. The actual application environment requires the optical fiber to have a certain bending resistance, and if the optical fiber refractive index profile is not properly designed, it will lead to bending. Deterioration of parameters such as performance and dispersion

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