Ultralow-loss and large-effective area optical fiber

Abstract

An ultralow-loss and large-effective area optical fiber of the present invention comprises, orderly from inside to outside, a core layer, cladding layers and a coating layer. The core layer is a pure quartz glass layer, and the radius of the core layer is between 4 micrometers and 6 micrometers. An inner cladding layer is a fluorine-doped inner cladding layer, the radius r2 of the inner cladding layer is between 6 micrometers and 10 micrometers, and the relative refractive index is between -0.4% and -0.2%. The radius r3 of an intermediate clapping layer is between 12 micrometers and 25 micrometers, and an outer cladding layer is a pure silicon dioxide glass layer, and the radius r4 of the outer cladding layer is between 25 micrometers and 45 micrometers. The coating layer adopts the polyacrylate and comprises an inner coating layer and an outer coating layer, the diameter of the inner coating layer is 192 micrometers, and the diameter of the outer coating layer is 245 micrometers. The advantages of the present invention are that: the comprehensive performance parameters of the optical fiber, such as the cut-off wavelength, the bending loss, the dispersion, etc., are good in an application waveband; the optical fiber can be used for the long-distance optical fiber communication spanning the mal-conditions, such as the gobi, the deep sea, etc.; the layers of the optical fiber are good in roundness, so that the round appearance of the optical fiber is guaranteed; the stress of the optical fiber can reach 2% or even more.

Description

technical field [0001] The invention relates to the field of optical fibers, in particular to an optical fiber with ultra-low loss and large effective area. 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 ca...

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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