Wideband semi-step type multimode optical fiber

Abstract

The invention provides a wideband semi-step type multimode optical fiber. The wideband semi-step type multimode optical fiber comprises a fiber core layer and a coating layer, wherein GeO2 (germanium dioxide) and / or P2O5 (phosphorus pentoxide) and / or F (fluorine) is doped into the fiber core layer; the fiber core layer comprises a transient area and a platform area in a concentric way; the transient area is formed by extending from the center of the fiber core layer to the outside with the distance of R1; the platform area is formed by extending from the center R1 of the fiber core layer to the outside with the distance of R2-R1 until to the boundary of the fiber core layer. The distribution of refractive index of the wideband semi-step type multimode optical fiber meets the formula which is shown in the attached figure, wherein r is the radial distance away from a fiber core axis of the fire core layer; R2 is the radius of the fiber core layer; Rmax is the radius of the coating layer; n0 is the refractive index of the center of the fiber core layer; nR1 is the refractive index of the boundary of the gradient zone; nc is the refractive index of the coating layer; delta0 is the relative refractive index difference between the center of the fiber core layer and the boundary of the transient area, and is shown in the attached figure.

Description

Technical field [0001] The present invention relates to the field of optical communication technology, in particular to a broadband (wide wavelength range) half-step multimode optical fiber. Background technique [0002] In optical fiber communication systems, optical fibers are used as the transmission medium of light waves, and their characteristics have a very important impact on the transmission of optical signals. The multi-mode fiber has a large core diameter and a large numerical aperture, which not only can couple more optical power from the light source, but also the matching components are cheap and easy to operate. At present, multimode optical fiber has been widely used in medium and short distance optical fiber network systems due to its low system cost advantage. [0003] High bandwidth multimode fiber (such as OM3, OM4), under the action of 850nm multimode laser light source, a single OM3 multimode fiber can support a rate of 10Gbps, and a transmission distance of u...

AI Technical Summary

Problems solved by technology

At present, the typical bend-insensitive multimode optical fiber adopts the design of adding a concave structure on the core layer. Since the concave layer is very close to the core layer, it must be continuously completed in the same process as the core layer during the core rod manufacturing process. The addition of the concave layer seriously affects the core rod. The production capacity of the production equipment causes a substantial increase in the manufacturing cost of the mandrel

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