Preparation technology for optical fiber with large effective area

Abstract

The invention relates to a preparation technology for an optical fiber with a large effective area. The preparation technology comprises preform preparation, an optical fiber melting and annealing process and an optical fiber drawing and curing process, wherein preform preparation adopts a VAD, MCVD and OVD combined process, a core rod is deposited with the VAD process, rapid deposition of the core rod is realized, and optical attenuation is reduced substantially; a cladding index sinking structure is realized with MCVD, and an outer cladding layer is deposited with the OVD process; a gradient temperature field ranging from 800 DEG C to 1,200 DEG C is formed in an annealing and holding furnace, the optical fiber is cooled gradually in the annealing and holding furnace, and internal stress is released basically; processing can be finished after the cured optical fiber is screened. The combination property parameters such as cut-off wavelength, bending loss, dispersion and the like are good in applied wavebands, the optical fiber can be taken as long-distance optical fiber for communication under harsh conditions such as gobi, deep sea and the like, the roundness of each layer of the optical fiber is good, the appearance is roundly formed, and the strain of the optical fiber can reach 2% or even higher.

Description

technical field [0001] The invention relates to the field of optical fibers, in particular to a preparation process of an optical fiber with a 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, ...

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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