Low-attenuation and large-effective-area single-mode optical fiber

Abstract

The invention relates to a low-attenuation and large-effective-area single-mode optical fiber, which comprises a core layer and a cladding layer. The low-attenuation and large-effective-area single-mode optical fiber is characterized in that a radius r1 of the core layer ranges from 5.2 to 6.5 microns; a relative refractive index delta n1 of the core layer ranges from 0.20 to 0.30%; the exterior of the core layer is sequentially wrapped by an internal cladding layer, a pure silicon dioxide internal cladding layer, a recessed cladding layer and an external cladding layer from the inside to the outside; a radius r2 of the internal cladding layer ranges from 8 to 10.5 microns, and a relative refractive index delta n2 ranges from -0.10 to 0.05%; a radius r3 of the pure silicon dioxide internal cladding layer ranges from 9.5 to 14 microns, and a relative refractive index delta n3 ranges from -0.03 to 0.03%; a radius r4 of the recessed cladding layer ranges from 13 o 18 microns, and a relative refractive index delta n4 ranges from -0.50 to -0.25%; and the external cladding layer is a pure silicon dioxide glass layer. The low-attenuation and large-effective-area single-mode optical fiber adopts a core cladding layer design co-doped with germanium, fluorine and alkali metal, and optimizes the viscosity so as to reduce attenuation performance of the optical fiber; and the core cladding waveguide structure is reasonably designed, so that the optical fiber has large effective area; and the viscosity matching and stress matching inside the optical fiber are balanced by means of the pure silicon dioxide glass, thereby further reducing attenuation.

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

[0014] First, suppress the cut-off of the fundamental mode: the difference between the refractive index of the outer cladding material and the core material is too small, which will cause the leakage of the fundamental mode of the fiber, thereby affecting the attenuation of the fiber

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