A single-mode optical fiber with ultra-low attenuation and large effective area

Abstract

The invention relates to an ultralow-attenuation large-effective-area single mode fiber, comprising a core layer and a cover layer covering and winding the core layer. The ultralow attenuation large-effective-area single mode fiber is characterized in that the radius r1 of the core layer is 5-6.5 microns, and the relative index of refraction delta n1 is 0.02-0.14%; the core layer is a chlorine-doped silicon dioxide glass layer, and the content of chlorine in the core layer is 0.4-2 wt%; the cover layer is composed of an inner cover layer, a sunken inner cover layer, an auxiliary outer cover layer and an outer cover layer, which sequentially cover and wind the core layer from inside to outside; the radius r2 of the inner cover layer is 9-14 microns, and the relative index of refraction delta n2 is smaller than or equal to -0.18%; the radius r3 of the sunken inner cover layer is 12-20 microns, and the relative index of refraction delta n3 is smaller than or equal to -0.40%; the radius r4 of the auxiliary outer cover layer is 35-50 microns, and the relative index of refraction delta n4 is smaller than or equal to -0.18%; the outer cover layer is a pure silicon dioxide glass outer cover layer. The ultralow attenuation large-effective-area single mode fiber has low attenuation, the core layer and the cover layer are arranged reasonably, the viscosity is matched excellently, and the manufacturing process is simple.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a single-mode optical fiber with ultra-low attenuation and large effective area. Background technique [0002] At present, the hot spot in the field of optical fiber manufacturing is the preparation of new ultra-low attenuation single-mode optical fiber products, so finding an effective method to reduce the attenuation coefficient of optical fiber and control manufacturing costs is a huge challenge for optical fiber manufacturing enterprises. The main difficulty lies in the following three points: First, how to reduce the attenuation: the main method at present is to reduce the Rayleigh scattering coefficient of the optical fiber; second, while obtaining an ultra-low attenuation coefficient, it is necessary to ensure that the optical parameters of the optical fiber meet the requirements of the ITU-T The standard mainly refers to the control of MFD, dispersion, cut-off wavelen...

AI Technical Summary

Problems solved by technology

We noticed that the attenuation level of this design is greater than 0.162dB / km, if it cannot solve the concentration factor increase caused by the co-doping of germanium and fluorine in the core layer and continue to reduce the viscosity of the core layer; and solve the higher viscosity of the outer cladding layer and the auxiliary inner cladding layer Viscosity mismatch, this solution is difficult to continue to reduce the attenuation of the fiber

Images