Step type ultralow attenuation six-mode optical fiber

Abstract

The invention relates to a step type ultralow attenuation six-mode optical fiber which comprises a core layer and a wrapping layer. The radius R1 of the core layer is 10-20 micrometers, the relative refractive index difference delta 1 of the core layer is minus 0.05-0.2%, an inner wrapping layer, a sunken inner wrapping layer, an auxiliary outer wrapping layer and an outer wrapping layer sequentially wrap the core layer from interior to exterior, the radius R2 of the inner wrapping layer is 13-23 micrometers, delta 2 is minus 0.6-minus 0.15%, the radius R3 of the sunken inner wrapping layer is15-25 micrometers, delta 3 is minus 0.9-minus 0.3%, the radius R4 of the auxiliary outer wrapping layer is 40-50 micrometers, delta 4 is minus 0.7-minus 0.25%, the outer wrapping layer is a pure silica glass layer, and the optical fiber supports broadcasting on a C waveband in six LP modes of LP01, LP11, LP21, LP02, LP31 and LP12. Long-distance signal transmission in the six modes can be supported, each mode has a lower attenuation coefficient, the manufacturing cost is low, and the bending loss, color dispersion and other comprehensive performance of the optical fiber reach a good level on the stress waveband.

Description

technical field [0001] The invention relates to a few-mode optical fiber used in an optical fiber communication system, in particular to a step-type ultra-low attenuation six-mode optical fiber. Background technique [0002] Single-mode optical fibers are widely used in optical fiber communication networks due to their advantages such as fast transmission rate, large information carrying capacity, and long transmission distance. In recent years, with the increasing demand for capacity of communication and big data services, the network bandwidth has rapidly expanded, and the capacity of optical transmission networks is gradually approaching the Shannon limit of a single optical fiber: 100Tb / s. Space-division multiplexing and mode-division multiplexing technologies can break the traditional Shannon limit and achieve higher bandwidth transmission, which is the best way to solve the problem of transmission capacity. The fibers that support this multiplexing technology are mult...

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Problems solved by technology

In this way, the viscosity of the core layer of the pure silicon core is relatively high, and at the same time, the viscosity of the inner cladding layer doped with a large amount of F is relatively low, which will cause an imbalance in the viscosity matching of the fiber structure, so that the virtual temperature of the fiber will increase rapidly, resulting in the R of the fiber. d Increase

This not only offsets the benefits brought by the reduction of doping, but also may cause the fiber attenuation reverse anomaly

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