Gradual refractive index bending resistant multimode optical fiber

Abstract

The invention relates to a gradual refractive index bending resistant multimode optical fiber, which includes a sandwich layer and a cladding, and is characterized in that the radius of the sandwich layer is 20 to 50 microns; the refractive index of the sandwich layer is distributed in a gradient gradation type, the distribution power exponent Alpha is 1.89 to 1.97, and the maximum relative refringence delta 1% max of the sandwich layer is 0.9% to 2.72%; the inner cladding is arranged adjacent to the sandwich layer, the radius of the inner cladding is 22 to 57 microns, and the relative refringence delta 2% is minus 0.02% to 0.02%; and a middle cladding and an outer cladding are arranged outwards the inner cladding sequentially, the middle cladding is a pure quartz glass layer, the radius of the middle cladding is 32 to 60 microns, the relative refringence delta 3% is minus 0.01% to 0.01%. The gradual refractive index bending resistant multimode optical fiber provided by the invention not only reduces the bending dissipation of the optical fiber, but also guarantees that optical fiber has high transmission bandwidth at a 1300 nm window, effectively improves the light collection and concentration capabilities of the optical fiber to LEDs, VCSELs or LDs through increasing the core diameter and numerical aperture, and improves the coupling fault-tolerant capability of luminous devices, namely between the light source and the light transmitting device, i.e. between optical fibers.

Description

Technical field [0001] The present invention involves a gradient refractive index multimodal optical fiber applied in the 1300nm transmission window optimization in a data signal transmission, optical fiber sensing, and optical devices. This optical fiber not only has good bending performance, but also has easy coupling and light power distribution of light sources and uniformity of light power distribution., In the 1300Nm window, which has high bandwidth, belongs to the field of optical communication technology. Background technique [0002] Fiber communication begins with the invention and application of multi -mode fiber.In the past ten years, although single -mode optical fiber has become the most important variety in the optical fiber market, multi -mode fiber has never been replaced, but has always maintained a stable growth market demand.It can meet the use of light signals, energy transmission, LAN data transmission and optical devices.At present, the cost of the multi -m...

AI Technical Summary

Problems solved by technology

Many documents, including the patent CN183049C, only focus on how to prepare a preform with a precise refractive index profile. However, during the drawing process of the preform, the residual stress and the diffusion of the components make the refractive index of the optical fiber better than that of the preform. Great distortion, which reduces the bandwidth of the fiber

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