A low-attenuation bend-insensitive single-mode fiber

Abstract

The invention relates to a low-attenuation bend-insensitive single-mode optical fiber used in an optical communication transmission system, comprising a core layer, a sunken inner cladding, an inner cladding, a sunken outer cladding and a pure silica glass outer cladding, characterized in that The core layer is composed of the first core layer, the second core layer and the third core layer with the refractive index from high to low from the inside to the outside. The radius R1 of the first core layer is 2.5μm~3.3μm, and the relative refractive index The difference Δ1 is 0.25%~0.38%; the second core radius R2 is 4μm~5μm, and the relative refractive index difference Δ2 is 0.15%~0.25%; the third core radius R3 is 5.3μm~6.3μm , the relative refractive index difference Δ3 is -0.03%~0.15%. The core cladding of the present invention is related to the realization of low attenuation, large effective area, and better combination and unification of bending resistance. The optical fiber has an attenuation performance far superior to that of conventional G.652. The cost of building related base stations and other system equipment, and has better macroscopic bending performance than conventional G.652.D optical fiber, so as to meet the harsher wiring environment or FTTx use environment.

Description

technical field [0001] The invention relates to a low-attenuation bend-insensitive single-mode optical fiber used in an optical communication transmission system. The optical fiber has low attenuation, excellent bending insensitivity, and the mode field diameter is compatible with the G.652.D standard, and belongs to The field of optical communication technology. Background technique [0002] Due to its characteristics of large capacity, long transmission distance, fast transmission speed, and economy, optical fiber communication has been widely used in long-distance backbone networks to metropolitan area networks and access networks. The development of optical fiber communication technology has always been aimed at faster transmission rate, larger capacity and longer transmission distance, constantly improving and improving the performance index of optical fiber and optical fiber communication technology. Especially in recent years, with the explosive growth of IP traffic,...

AI Technical Summary

Problems solved by technology

However, the reduction of the mode field diameter will result in a reduction of the effective area, and it is easy to cause more defects and increase the attenuation during wire drawing. At the same time, the cut-off wavelength of the fiber must be smaller than the working wavelength to ensure the single-mode working characteristics, so by There is limited space to change the MAC value of the fiber to improve the bending performance of the fiber

The second is that the bending performance can be improved by using a double-clad structure in which the inner cladding is a depressed cladding, but the depressed cladding may cause the "LP01 mode leakage" phenomenon of the optical fiber

However, in the cross-sectional design and manufacturing methods of these conventional G.657 optical fibers, the core layer is Ge / F co-doped. In order to obtain the best macrobending performance, the relative refractive index of the core layer is generally greater than 0.35%, that is, the core layer Ge More doping, so it will bring greater Rayleigh scattering and increase the attenuation of the fiber

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