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

Abstract

The present invention relates to an ultralow attenuation large-effective-area single-mode optical fiber. The ultralow attenuation large-effective-area single-mode optical fiber comprises a core layer and wrapping layers, and is characterized in that a radius R1 of the core layer is 4.5-6.5 [mu]m, [delta]1 of the core layer is -0.05% to 0.10%, the core layer is wrapped from inside to outside in turn by an inner wrapping layer, a first sunken inner wrapping layer, a middle inner wrapping layer, a second sunken inner wrapping layer, an auxiliary outer wrapping layer and an outer wrapping layer, a radius R3 of the inner wrapping layer is 8.5-14 [mu]m, [delta]2 is -0.35% to -0.12%, an radius R3 of the first sunken inner wrapping layer is 13-22[mu]m, [delta]3 is -0.7% to -0.30%, a radius R4 of the middle inner wrapping layer is 14-23[mu]m, [delta]4 is -0.40% to -0.15%, a radius R5 of the second sunken inner wrapping layer is 28-30 [mu]m, [delta]5 is -0.6% to -0.25%, a radius R6 of the auxiliary outer wrapping layer is 35-50[mu]m, [delta]6 is -0.55% to -0.15%, and the outer wrapping layer is a pure silicon dioxide glass layer. The ultralow attenuation large-effective-area single-mode optical fiber is low in attenuation and large in effective area, and has excellent bending loss and dispersion characteristics, and cabling cut-off wavelength is smaller than 1530 nm.

Description

technical field [0001] The invention relates to the technical field of optical fiber transmission, in particular to a single-mode optical fiber with ultra-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 do...

AI Technical Summary

Problems solved by technology

However, if in the design of ultra-low attenuation and large effective area optical fiber, especially in the ultra-low attenuation and large effective area optical fiber using pure silica material as the outer cladding, because the refractive index of the core layer is the same as that of the pure silica outer cladding The difference is not large, and the core diameter of the large effective area fiber design is generally very large, which is more likely to cause the most troublesome fundamental mode leakage in the fiber waveguide design, causing abnormal long-wavelength attenuation of the fiber

However, conventional solutions, such as increasing the volume of a single depressed cladding, will cause the cut-off wavelength of the fiber to exceed the standard. Therefore, finding a better design method for the depressed cladding is also the focus of achieving ultra-low attenuation and large effective area fiber design.

[0014] Second, consider viscosity matching: If there is no viscosity optimization design in the outer cladding material, its viscosity will not match the viscosity gradient of the inner cladding and core layers, which will also cause defects in the interface position and virtual temperature rise, thereby increasing the optical fiber attenuation

[0016] The document US8515231B2 proposes a single-mode optical fiber with a double depressed cladding structure, but the core rod is designed with high-concentration Ge doping, and the core layer diameter is small, so it cannot achieve ultra-low attenuation performance, and the effective area is obviously less than 100 μm 2 , can not suppress the nonlinear effect of the fiber

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