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

Abstract

The invention relates to a single mode optical fiber with ultra-low attenuation and a large effective area. The fiber includes a core layer and a cladding layer, and is characterized in that the radius of the core layer is 5.5-7.5 um, the relative refractive index difference is 0-0.20%, an auxiliary core layer, an inner cladding layer, a subsided inner cladding layer, an auxiliary outer cladding layer and an outer cladding layer coat successively the core layer from inside to outside, the radius R2 of the auxiliary core layer is 9-15 um, the relative refractive index difference delta N2 is -0.20-0, the inner cladding layer radius R3 is 11-17 um, the relative refractive index difference delta N3 is -0.20-0, the subsided inner cladding layer radius R4 is 15-19 um, the relative refractive index difference delta N4 is -0.60-0.20%, the auxiliary outer cladding layer radius R5 is 35-52 um, the relative refractive index difference delta (n5) ranges from -0.4 to 0.10%, and the outer cladding layer is pure silica glass. According to the fiber, the internal viscosity matching of the optical fiber is reasonably designed, and the defects in the preparation process of the optical fiber are reduced, which not only makes the waveguide structure and the viscosity matching of the optical fiber more reasonable, and makes the fiber have low attenuation, large effective area and better bending loss, but also reduces the manufacturing cost of the optical fiber.

Description

technical field [0001] The invention relates to a single-mode optical fiber with ultra-low attenuation and large effective area, which is used in a long-distance, large-capacity, high-speed land or seabed communication transmission system, and belongs to the technical field of optical fiber communication. Background technique [0002] With the continuous improvement of wired and wireless access bandwidth, the rapid development of mobile Internet, cloud computing, big data and other technologies, the global demand for bandwidth is growing explosively, and 400G will be the direction for future upgrades and new construction of the next-generation backbone network. How to further increase the transmission capacity on the basis of 400G transmission signals is the focus of various system equipment manufacturers and operators. [0003] In the era of 100G and beyond 100G, nonlinear effects and fiber attenuation have become the main factors restricting the improvement of system trans...

AI Technical Summary

Problems solved by technology

However, although this method can effectively reduce the attenuation of the optical fiber, it is relatively complicated to prepare the core rod in multiple batches, and the control of the concentration of alkali metal doping is extremely high, which is not conducive to the large-scale production of optical fibers.

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