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

Abstract

The invention relates to a single-mode optical fiber with ultralow attenuation and a large effective area. The single-mode optical fiber comprises a core layer and a wrapping layer and is characterized in that the core layer comprises a sinking core layer body and an outer core layer body from center to outside; the wrapping layer comprises an inner wrapping layer body, a sinking inner wrapping layer body, an auxiliary outer wrapping layer body and an outer wrapping layer body from inside to outside; the radius R1 of the sinking core layer body ranges from 1.5 Mum to 4 Mum, and the relative refractivity ranges from minus 0.10% to 0.02%; the radius R2 of the outer core layer body ranges from 4.5 Mum to 6.5 Mum, and the relative refractivity ranges from minus 0.08% to 0.10%; the radius R3 of the inner wrapping layer body ranges from 9 Mum to 15 Mum, and the relative refractivity ranges from minus 0.25% to minus 0.1%; the radius R4 of the sinking inner wrapping layer body ranges from 12 Mum to 20 Mum, and the relative refractivity ranges from minus 0.6% to minus 0.25%; the radius R5 of the auxiliary inner wrapping layer body ranges from 35 Mum to 50 Mum, and the relative refractivity ranges from minus 0.45% to minus 0.15%; the outer wrapping layer body is a pure silicon dioxide glass layer. The single-mode optical fiber has the large effective area and good bending loss and chromatic dispersion performance, the cabling cutoff wavelength is smaller than 1530 nm, and the production cost is low.

Description

technical field [0001] The invention relates to the field of optical fiber transmission, in particular to a single-mode optical fiber with ultra-low attenuation and large effective area, which is used in a long-distance, large-capacity and high-speed communication transmission system. Background technique [0002] With the emergence of coherent transmission technology, in the field of optical fiber transmission, some important indicators that limit long-distance, large-capacity and high-speed transmission have no longer become limitations. In future transmission systems, chromatic dispersion (CD) and polarization mode dispersion ( PMD) indicators will be further relaxed. However, the attenuation and effective area of ​​optical fibers are still important issues that limit the development of optical communication technology. [0003] Especially in the future 400G or higher transmission system, the reduction of attenuation will greatly reduce the construction and maintenance c...

AI Technical Summary

Problems solved by technology

However, because of the conventional fluorine outer cladding design, the core layer is still relatively viscous than the fluorine outer cladding, and defects are still prone to occur during the wire drawing process, which limits the further reduction of fiber attenuation performance. In addition, the fluorine outer cladding structure is adopted. Due to the fluorine The cost of doping is high, and the viscosity is very low. In the process of preparing and drawing optical fiber preforms, compared with the preparation process of pure silica outer cladding preforms, the preparation process is more complicated, the process control progress is higher, and the cost is also higher. It is not easy Preparing large-size preforms to reduce costs

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