Single-mode optical fiber with low attenuation and large effective area

Abstract

The invention relates to a single-mode optical fiber with low attenuation and large effective area. The single-mode optical fiber comprises a core layer and a wrapping layer, and is characterized in that the radius r1 of the core layer is 5.4-6.5 microns, the relative refractive index difference delta n1 is 0. 18% -0.32%, the core layer is wrapped by the wrapping layer, and the wrapping layer sequentially comprises, from inside to outside, an inner wrapping layer, a sunken wrapping layer and an outer wrapping layer, the radius r2 of the inner wrapping layer is 9 -13 microns, and the relative refractive index difference delta n2 is -0.10%-0.10%, the radius r3 of the sunken wrapping layer is 10.5-15 microns, and the relative refractive index difference delta n3 is -0.60% - -0.35%; and the outer wrapping layer is a pure silicon dioxide glass layer. The viscosity of the core wrapping layer is optimized by adopting alkali metal, so that the attenuation performance of the optical fiber is improved. Meanwhile, the waveguide structure of the core wrapping layer is reasonably designed, so that the optical fiber has a large effective area. The method is simple in process and convenient for preparing a large-size optical fiber prefabricated rod. The outer wrapping layer of the outermost layer adopts pure silicon dioxide, so that the proportion of the fluorine-doped glass in the optical fiber is reduced, so that the production cost of the optical fiber is reduced.

Description

technical field [0001] The invention relates to the technical field of optical fiber transmission, in particular to a single-mode optical fiber with low attenuation and large effective area. Background technique [0002] With the rapid growth of IP network data services, operators' demand for transmission capacity continues to increase, and the single-fiber capacity in the existing network is gradually approaching the limit value of 100Tbps. The 100G transmission system has entered the first year of commercial use. How to further increase the transmission capacity on the basis of 100G transmission signals is the focus of attention of various system equipment manufacturers and operators. [0003] In 100G and beyond 100G systems, the receiving end adopts coherent reception and digital signal processing technology (DSP), which can digitally compensate the dispersion and polarization mode dispersion (PMD) accumulated in the entire transmission process in the electrical domain; ...

AI Technical Summary

Problems solved by technology

However, the preparation process of multilayer structure is complicated, and the viscosity of fluorine-doped glass is low, and the cost is high, which is not conducive to the overall reduction of optical fiber attenuation

Images