Bending-resistant single-mode optical fiber

Abstract

The invention relates to a bending-resistant single-mode optical fiber, which includes a core layer and a cladding. The refractive index of the core layer is in parabolic distribution; the distribution index alpha is 2.2 to 2.5; the core layer diameter 2R1 is 7.2 to 8.2 micrometers; and the relative refractive index difference delta 1max of the highest point of the core layer is 0.360% to 0.450%.The cladding includes an inner cladding, a sagging cladding, an auxiliary sagging cladding and an outer cladding that are arranged successively from inside to outside; the inner cladding diameter 2R2is 16.0 to 19.0 micrometers and the delta 2 is -0.06% to 0.00%; the diameter of the sagging cladding2R3 is 29.0 to 34.0 micrometers and delta 3 is -0.30% to -0.50%; the diameter of the auxiliary sagging cladding2R4 is 34.0 to 48.0 micrometers and delta4 is -0.14% to -0.08%; and the outer cladding is a pure silicon dioxide outer layer. According to the invention, the leakage of the fundamental modein the bending state is suppressed by optimizing the refractive index depths and widths of the two sagging cladding layers, so that the fiber has the good bending performances under the small bendingradius and large bending radius. The fiber also has the good bending resistance performance at the long wavelength, so that the upgrade need of evolution of the next generation of PON to the long wavelength is met.

Description

technical field [0001] The invention relates to a bending-resistant single-mode optical fiber used in an optical communication transmission system. The optical fiber has excellent bending-resistant performance and belongs to the technical field of optical communication access networks. Background technique [0002] With the continuous development of optical fiber transmission technology, fiber-to-the-home and fiber-to-the-desktop have become an important development direction of communication access network construction. Optical fiber as a transmission medium plays a vital role in it. In the actual laying and configuration of FTTx optical fiber lines, it is often necessary to perform various operations on optical fibers indoors and in narrow environments, such as installing at right-angled corners of walls, winding optical fibers in increasingly miniaturized storage boxes to handle optical fibers Lengthy, so it is necessary to design and develop optical fibers with excellen...

AI Technical Summary

Problems solved by technology

This structure is used to reduce the bending loss, and the prepared optical fiber also conforms to the G.652 standard, but it is typically only suitable for use under a bending radius of 7.5mm. The patent does not give an example of bending loss with a bending radius of 5.0mm and Specific parameters

At the same time, it can be seen that the radius of the intermediate cladding in the refractive index profile is 18um-20um, while the fluorine-doped second depressed cladding is wider, reaching 25um-40um, and the proportion of the fluorine-doped layer in the optical fiber is significantly higher. The designed The complex structure of multi-layer sunken cladding and intermediate cladding is not conducive to its large-scale production and practical application

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