Preparation of ultra-low loss optical fiber preform rod and optical fibers by axial vapor deposition method

An optical fiber and ultra-low technology, which is applied in the field of axial vapor deposition to prepare ultra-low loss optical fiber preforms and optical fibers, and can solve problems such as poor uniformity of radial refractive index, difficult deep fluorine doping process, and difficulty in mass production. , to achieve the effect of prolonging the production cycle, uncomplicated production process and small air flow
CN107721149AInactive Publication Date: 2018-02-23HENGTONG OPTICAL MATERIAL CO LTD +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
HENGTONG OPTICAL MATERIAL CO LTD
Publication Date
2018-02-23
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses ultra-low loss optical fibers. Alkali metal elements are added during the VAD deposition technological process to reduce the viscosity of a core layer, enable the core layer tobe more matched with an inner cladding layer and an outer cladding layer, and reduce the internal stress, so that the ultra-low loss fibers with low transmission attenuation can be manufactured. A preparation method of the ultra-low loss optical fibers, disclosed by the invention, is based on the traditional VAD deposition process. A small amount of alkali metal is doped in the deposition process, and the doping amount is small and the gas flow rate is small, so that the normal deposition process is not affected too much, and doping is finished while depositing, and therefore, the productioncycle is prolonged, and then the production stability can be ensured, the production process is not complex, and the preparation method can be used in large-scale production. By the adoption of the invention, optical fiber attenuation can be optimized to ultra-low loss standards, and relay stations can be reduced in high speed transmission with long distance and low attenuation to lower the cost and improve the transmission quality.
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Description

technical field

[0001] The invention relates to the technical field of optical fiber communication, in particular to an axial vapor deposition method for preparing ultra-low loss optical fiber preform rods and optical fibers. Background technique

[0002] With the continuous development of long-distance optical fiber transmission, especially the rapid development of Internet technology and 4G and passive optical network technologies, the requirements for reducing optical fiber loss are getting higher and higher. The current ultra-low loss optical fiber core rods mostly use pure silicon core rods containing trace amounts of alkali metals. Chinese patents CN103472529A and CN102654602A both provide a pure silicon core solution to prepare low-loss optical fibers. The core layer is not doped with Ge, the inner cladding is deeply doped with fluorine, and the outer cladding is normally doped with fluorine. Both involve the preparation of a deep fluorine-doped inner cladding. The p...

Claims

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