High-bandwidth bending-insensitive multimode optical fiber

Abstract

The present invention relates to a high-bandwidth bending-insensitive multimode optical fiber. The optical fiber comprises a core layer and a cladding layer, wherein the cladding layer includes an inner cladding layer, a depressed cladding layer and an outer cladding layer which are distributed from inside to outside. The optical fiber is characterized in that the refractive index profile of the core layer is of a parabola shape; the distribution index alpha of the core layer ranges from 2.0 to 2.3; the radius R1 of the core layer ranges from 23 to 27 micrometers; the maximal relative refractive index difference delta1max of the center of the core layer ranges from 0.9% to 1.2%; the core layer is a germanium (G), phosphorus (P) and fluorine (F) co-doped silica glass layer; the contributionamount deltaP0 of phosphorus (P) at the center of the core layer ranges from 0.01% to 0.30%; the contribution amount deltaP1 of phosphorus (P) at the interface of the core layer and the inner cladding layer ranges from 0.01% to 0.30%; the content of phosphorus (P) at the center of the cover layer is consistent with the content of phosphorus (P) at the edge of the core layer; the doping amount offluorine (F) is gradually increased from the center of the core layer to the edge of the core layer; the contribution amount deltaF0 of fluorine (F) at the center of the core layer ranges from 0.0% to-0.1%; and the contribution amount deltaF1 of fluorine (F) at the edge of the core layer ranges from -0.4% to -0.20%;. The material compositions of the high-bandwidth bending-insensitive multimode optical fiber and the structural design of the core layer and cladding layer of the high-bandwidth bending-insensitive multimode optical fiber are reasonable; the chromatic dispersion of the optical fiber is reduced; the bandwidth performance of the optical fiber is improved; and the attenuation of the optical fiber is reduced.

Description

technical field [0001] The invention relates to a high-bandwidth bending-insensitive multimode optical fiber, which belongs to the technical field of optical communication. Background technique [0002] According to the description of multimode fiber in the fiber optic product specification standard IEC 60793-2 of the International Electrotechnical Commission (IEC), A1 type fiber is multimode fiber, and according to different geometric structures, A1 type fiber is divided into A1a, A1b and A1b. Class A1d. Type A1a fiber is 50 / 125 μm graded index fiber, A1b type fiber is 62.5 / 125 μm graded index fiber, A1d type fiber is 100 / 140 μm graded index fiber. Among them, A1a fiber is currently the most widely used type of multimode fiber in commercial use, and it is divided into A1a.1, A1a.2 and A1a.3 fibers according to the bandwidth performance from small to large, corresponding to the composition of the ISO / IEC standard. Cable fiber types OM2, OM3 and OM4. [0003] With its low ...

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Problems solved by technology

However, due to the high chromatic dispersion of the germanium-doped core, the optimal α value is sensitive to the operating wavelength of the light propagating in the fiber

Therefore, the bandwidth of traditional multimode fiber is very sensitive to the fluctuation of α in the core layer, and a slight deviation from the optimal α value will lead to a decrease in bandwidth, making the high-bandwidth operating wavelength range of traditional multimode fiber very narrow

In addition, since germanium is a metal atom with a large radius, when its doping amount is high, the attenuation of the fiber is high

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