High Bandwidth Bend Insensitive Multimode Fiber

Abstract

The present invention relates to a high-bandwidth bending insensitive multimode optical fiber. The high-bandwidth bending insensitive multimode optical fiber comprises a core layer and claddings surrounding the core layer. The refractive index cross section of the core layer is in the shape of a parabola. The high-bandwidth bending insensitive multimode optical fiber is characterized in that the claddings include an inner cladding, a first recessed cladding, a second recessed cladding and an outer cladding which are distributed sequentially from inside to outside; the unilateral radial width (R2-R1) of the inner cladding ranges from 1 to 3 microns, and the relative refractive index difference delta 2 of the inner cladding ranges from -0.2% to 0.05%; the unilateral radial width (R3-R2) of the first recessed cladding ranges from 3 to 8 microns, and the relative refractive index difference delta 3 of the first recessed cladding ranges from -0.9% to 0.3%; the unilateral radial width (R4-R3) of the second recessed cladding ranges from 6 to 30 microns, and R4 is smaller than or equal to 58 microns, and the relative refractive index difference delta 4 of the second recessed cladding ranges from -0.15% to 0.01%; and the radius R5 of the outer cladding ranges from 60 to 65 microns, and the relative refractive index difference delta 5 of the outer cladding ranges from -0.15% to 0.15%. The optical fiber of the invention has the advantages of reasonable material composition and structural design, convenient process control, improved and reduced inner stress distribution, enhanced bending resistance and increased bandwidth.

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] With its low system cost advantage, multimode fiber has become a high-quality solution for short-distance high-speed transmission networks, and has been widely used in data centers, office centers, high-performance computing centers, and storage area networks. The application scenarios of multimode optical fiber are often narrow cabinets, distribution boxes and other integrated systems, and the optical fiber needs to withstand a small bending radius. When a conventional multimode fiber is bent at a small angle, the higher-order modes propagating near the edge of the fiber core can easily leak out, resulting in signal loss. Therefore, this puts more stringent requirements on the multimode fiber, in which the bandwidth and bending resistance of the fiber are the two most impor...

AI Technical Summary

Problems solved by technology

[0006] Document CN104360435 describes a bend-insensitive multimode optical fiber, which uses a viscosity-matched double inner cladding structure, which reduces the influence of drawing tension on the core layer of the optical fiber from the viscosity design, and reduces the bending sensitivity of the optical fiber, but does not explain Influence of Viscosity of Cladding Material on Optical Fiber Properties

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