Large effective area optical fiber

Abstract

The invention discloses a large effective area optical fiber. The large effective area optical fiber is provided with a core layer, an inner cladding layer and an outer cladding layer from center to outside, wherein the core layer and the inner cladding layer are made of silica dioxide as a base material and doped with a dopant; the outer cladding layer is a pure silicon dioxide layer; the radius of the core layer is 4.5-6.5 micrometers, and the relative refractive index difference delta 1 of the core layer is 0.23%-0.35%; the radius of the inner cladding layer is 16.0-32.5 micrometers, and the relative refractive index difference delta 2 of the inner cladding layer is (-0.09%)-(-0.02%); the absolute value of the difference value between the core layer and inner cladding layer viscosity logarithms is not more than 0.105. The optical fiber achieves the matching of the core layer and inner cladding layer viscosity at a simple structure and a lower cost, and the absolute value of the difference value between the core layer and inner cladding layer viscosity logarithms is not more than 0.105.

Description

technical field [0001] The invention relates to the field of optical fiber technology, in particular to a large effective area optical fiber. Background technique [0002] The faster the transmission rate of optical fiber, the greater the signal-to-noise ratio required for error-free transmission. From the perspective of optical fiber, (1) The signal-to-noise ratio of the system is proportional to the signal light power incident on the optical fiber, and the optical power is proportional to the effective area of ​​the optical fiber. (2) The signal-to-noise ratio is inversely proportional to the loss of the optical fiber in the system. Therefore, the signal-to-noise ratio can be improved by increasing the effective area of ​​the fiber and reducing the loss of the fiber. Because of this, the development direction of next-generation optical fiber is large effective area and low loss. [0003] At present, the effective area of ​​ordinary single-mode optical fiber used in terr...

AI Technical Summary

Problems solved by technology

Due to the reduction of deposition efficiency when doping with fluorine, the deposition time will be increased, and the deposition process in the tube is limited by the size of the deposition tube, which cannot manufacture large-sized core rods, and the manufacturing cost is high

[0005] The existing patent literature also discloses the design of large effective area optical fibers with different optical fiber cross-sectional structures, but the refractive index profiles of these optical fibers are complex, containing more than 3 layers of cladding or a core layer with a graded index structure. Difficult, high manufacturing cost, and this type of fiber does not optimize the core-clad viscosity matching of the fiber, it is easy to cause residual stress and broken bonds in the fiber, which will increase the loss of the fiber

[0006] Therefore, the problem with the prior art is that it is not possible to achieve an ideal match of viscosity between the core layer and the inner cladding layer in a simple, easy-to-implement structure

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