Preparation method for large-sized bended insensitive multimode optical fiber preform

A bend-insensitive, optical fiber prefabricated rod technology, applied in the field of optical communications, can solve problems affecting the geometric uniformity and refractive index uniformity of optical fibers, and affecting the bandwidth performance of optical fibers, etc.

Active Publication Date: 2015-11-18
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Abstract
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Problems solved by technology

The geometric error of the outer deposition layer is continued and cumulatively amplified when the core layer is deposited, and affects the fi

Method used

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  • Preparation method for large-sized bended insensitive multimode optical fiber preform
  • Preparation method for large-sized bended insensitive multimode optical fiber preform
  • Preparation method for large-sized bended insensitive multimode optical fiber preform

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Embodiment Construction

[0052] Provide several detailed embodiments below, the present invention is described further.

[0053] Method 1: Doping deposition is performed on the inner wall of the pure quartz glass liner by PCVD process, and the reaction gas silicon tetrachloride (SiCl 4 ) and oxygen (O 2 ), and then into the fluorine-containing gas (C 2 f 6 ) and germanium tetrachloride (GeCl4) to adjust the refractive index, the mass flow controller (MFC) is used to precisely control the gas flow throughout the process; the reaction gas in the liner is turned into a plasma by microwave, and finally deposited in the form of glass On the inner wall of the liner, all the deposited layers constitute the core layer 10 of the preform, and the rest of the liner constitutes all or part of the inner cladding 20; after the deposition is completed, the deposition tube is melted into a solid mandrel by an electric heating furnace; and then PCVD Or the MCVD process carries out fluorine-doped deposition on the i...

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Abstract

The invention relates to a preparation method for a large-sized bended insensitive multimode optical fiber preform. The preparation method comprises: firstly carrying out doping and deposition through an in-tube method to form a multimode optical fiber core layer, melting a deposition tube through a heating furnace to form a solid mandril after deposition, and carrying out doping and deposition through an out-tube process to deposit a sunken coating and an outer coating separately by taking the mandril as a target rod; or carrying out negative doping by using a pure quartz glass outer lining tube through an in-tube method process to form the sunken coating and the outer coating of the preform; and then combining the prepared mandril with a deposited outer sleeve to form the optical fiber preform for an RIT (rod in tube) process or combining the prepared mandril with fluorine-doped or boron-doped quartz glass sleeve in a packaging manner and melting the two to a solid rod for a SCR (solid core rod) process, and then combining the solid rod with a large-diameter outer sleeve to form the optical fiber preform for the RIT process. The prepared optical fiber preform not only is large in outer diameter and high in core precision, but also is low in manufacturing cost, simple and agile in method and suitable for large-scaled production.

Description

technical field [0001] The invention relates to a method for preparing a large-size bend-insensitive multimode optical fiber preform, which belongs to the technical field of optical communication. Background technique [0002] With its low system cost, suitable bandwidth and ideal bending resistance, bend-insensitive multimode fiber has become a high-quality solution for short-distance high-speed transmission networks, and has been widely used in data centers, office centers, high-performance computing centers and Storage area network and other fields. The survey report shows that the global demand for multimode optical fiber is increasing year by year. China is one of the fastest growing multimode fiber markets. [0003] In recent years, the network transmission rate has developed rapidly, and 10Gb / s Ethernet has been maturely used in many data centers, enterprise networks and office centers. Moreover, users' demand for bandwidth is still rising, and there will be more a...

Claims

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Application Information

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IPC IPC(8): C03B37/018
Inventor 黄荣王润涵张磊龙胜亚王瑞春
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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