Ultralow-loss optical fiber

Abstract

The invention relates to an ultralow-loss optical fiber. The ultralow-loss optical fiber comprises a core layer, wrapping layers and coating layers in sequence from inside to outside. The core layer is a pure silica glass layer with the radius of 5-7 micrometers; the inner wrapping layer is a fluorine-doped inner wrapping layer with the radius r2 of 5-12 micrometers and the relative refractive index difference of -0.4--0.2%, the radius r3 of the middle wrapping layer is 12-25 micrometers, and the outer wrapping layer is a pure quartz glass layer with the radius r4 of 25-45 micrometers; the coating layers are nano-SiO2 polyacrylate composite coating layers and comprise the inner coating layer with the diameter of 192 micrometers and the outer coating layer with the diameter of 245 micrometers. The cutoff wavelength, the bending loss, the chromatic dispersion and other overall performance parameters of the ultralow-loss optical fiber are good in the application waveband, and the ultralow-loss optical fiber can be applied to long-distance optical fiber communication under gobi or deep sea needing crossing and under other extreme conditions; besides, the roundness of each layer of the optical fiber is good, and it is guaranteed that the formed appearance is round and smooth; the strain of the optical fiber can reach 2% or above.

Description

technical field [0001] The invention relates to the field of optical fibers, in particular to an ultra-low loss optical fiber. Background technique [0002] Optical fiber strength is one of the key indicators of ultra-low loss optical fiber, which is mainly reflected in the screening strain. The strain of ordinary optical fiber is generally about 1% to deal with the tension caused by laying and thermal expansion and contraction, while ultra-low loss optical fiber is used in ultra-long In distance optical communication links, it is often necessary to cross harsh environments such as Gobi and deep sea. When considering laying or environmental temperature changes, the tension suffered is greater than that of ordinary optical cables. Considering the national standard of "Deep Sea Optical Cable", the difficulty of laying and In terms of service life, etc., it is hoped that the strain of the ultra-low loss optical fiber will reach 2% or more, which can fully meet the needs of opti...

AI Technical Summary

Problems solved by technology

The impurity particles adhere to the surface of the optical fiber. During the cooling process, cracks and stress concentration are formed. The cracks on the optical fiber surface are gradually eroded by the action of water molecules in the atmospheric environment, resulting in the destruction of the silicon-oxygen tetrahedral structure, and the breakage of the silicon-oxygen bond will expand the microcracks. range, which affects fiber strength

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