A high-bandwidth multimode fiber

Abstract

The invention relates to a high-bandwidth multi-mode fiber which comprises a core layer and a wrapping layer, and is characterized in that the refractive index profile of the core layer is of a parabola shape, the distribution index alpha is 2.0-2.3, the radius R1 of the core layer is 23-37 [mu]m, the maximal relative refractive index difference [delta]1max of a core layer center is 0.9%-1.2%, thecore layer is a silica glass layer wherein Ge, P and F are jointly doped, the contribution [delta]P0 of P of the core layer center is 0.01% to 0.30%, the contribution [delta]P1 of P at the junction of the core layer and the inner wrapping layer is 0.01%-0.30%, the content of P in the core layer center is consistent with that of a core layer edge, the core layer F is used as the negative dopant, the doping amount of F is gradually increased in the direction from the core layer center to the core layer edge, the contribution [delta]F0 of F of the core layer center is 0.0% to -0.1%, and the contribution amount [delta]F1 of F of the core layer edge is -0.40% to -0.20%. The material composition and the core cladding structure of the invention are rationally designed, the chromatic dispersion is reduced, the bandwidth performance is improved, and the fiber attenuation is reduced.

Description

technical field [0001] The invention relates to a high-bandwidth multimode optical fiber and 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 system cost advantage, ...

AI Technical Summary

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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