A single-mode fiber

Abstract

The invention relates to a low-attenuation single mode optical fiber used in an optical fiber communication system. The single mode optical fiber comprises a core layer and a wrapping layer. The single mode optical fiber is characterized in that the refractive index distribution n (r) of the core layer and the g-type refractive index distribution of the core layer meet the formula: n (r)=n0*[1-2*delta 1*(r / R1)*g]*1 / 2 (r<=R1), the delta 1 of the core layer ranges from -0.05% to +0.05%, g ranges from 10 to 30, and the radius R1 of the core layer ranges from 4.0 microns to 5.0 microns; the wrapping layer sequentially comprises an inner wrapping layer, a middle wrapping layer and an outer wrapping layer from inner to outer, the delta 2 of the inner wrapping layer ranges from -0.3% to -0.45%, the radius R2 ranges from 20 microns to 30 microns, and the delta 3 of the middle wrapping layer is larger than delta 2, the numerical relationship between the relative refraction difference and the radius of the middle wrapping layer and the relative refraction difference and the radius of the inner wrapping layer is V=(R3-R2)*(delta 3-delta 2), and V ranges from 0.5*10-2-micron% to 7*10-2-micron%. The attenuation coefficient, at the 1550-nanometer position, of the optical fiber is smaller than or equal to 0.180dB / km. The low-attenuation single mode optical fiber is low in optical fiber loss, good in manufacturing technology, low in cost and suitable for scale production.

Description

technical field [0001] The invention relates to a low-attenuation single-mode optical fiber used in an optical communication system. The optical fiber has low optical fiber loss and good production applicability, and belongs to the technical field of optical communication. Background technique [0002] Single-mode fiber has the advantages of light weight, small size, anti-electromagnetic interference, fast transmission rate, large information capacity and long transmission distance. Worldwide, G.652 single-mode optical fibers have been laid and applied in large quantities in optical communication networks. With the further development of related optical devices, optical amplification technology and related modulation and demodulation technology, the optical communication system is continuously developing in the direction of higher transmission rate and longer transmission distance. The development of optical communication systems has also put forward more stringent requirem...

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Problems solved by technology

Generally speaking, the more F-doped content in the cladding, the more difficult it is to realize the process and the higher the manufacturing cost

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