Bend-insensitive multimode fiber

Abstract

The invention relates to a bend-insensitive multimode fiber comprising a core layer, inner sheath layers and an outer sheath layer. The bend-insensitive multimode fiber is characterized in that the radius R1 of the core layer is 23-26 micrometers, the refractivity section of the core layer is parabolic, the distribution index Alpha thereof is 1.9-2.2, a maximum relative refractive index difference Delta1 thereof is 0.9-1.2%, the first inner sheath layer, the second inner sheath layer and a recessed sheath layer are provided in order from inside to outside, the unilateral width of the first inner sheath layer is 1-3 micrometers, a relative refractive index difference Delta2 of the first inner sheath layer is -0.02-0.02%, the second inner sheath layer is an all-carbon dioxide layer 2-6 micrometers in unilateral width, the recessed sheath layer is an F-doped silica glass layer, and the recessed sheath layer is an all-silica glass layer. The double-inner-sheath structure of matching viscosity is used, the influence of drawing tension upon the core layer is reduced in terms of viscosity, and bend sensitiveness of the fiber is reduced; the width of the inner sheath layers and the size of the recessed sheath layer are reasonably optimized and designed, matching of the width and the size is achieved, and optimal width and size are acquired; meanwhile, excellent bend resistance and DMD (differential mode delay) performance are achieved.

Description

Technical field [0001] The present invention involves a bending non -sensitive multimodal fiber used in access to the network or small optical devices. The fiber has excellent bending performance and belongs to the field of optical communication technology. Background technique [0002] With the continuous development of science and technology, China has entered the era of rapid development of optical broadband and multi -business integration.The fusion of telecommunications networks, grids of power, and the Internet can carry a variety of informatization businesses, and can provide users with multiple services such as calling, Internet access, and watching TV.This will definitely put forward higher requirements for the high bandwidth and flexibility of the network infrastructure of operators and corporate data centers in order to support high -performance connections.Performance computing (such as cloud computing) and other applications.Therefore, in the next few years, the data...

AI Technical Summary

Problems solved by technology

[0012]The traditional bend-insensitive multimode optical fiber core layer is prepared in the form of Ge or Ge / F co-doping. Due to the large amount of doping, the viscosity of the core layer is very high. Small, when the fiber is drawn, the core layer is easily subjected to tensile stress under the action of the drawing tension, which causes the distortion of the fiber core layer section, affects the transmission of high-order modes in the core layer, and deteriorates the DMD performance

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