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Prefabricated fiber rod with several clad layers and its fabrication

A technology of an optical fiber preform and a manufacturing method, which is applied in the field of optical fiber manufacturing, can solve the problems of high optical fiber manufacturing cost, high proportion of high-purity raw materials, and high proportion of optical fiber manufacturing cost, and achieves the effect of reducing raw material cost and manufacturing cost.

Inactive Publication Date: 2003-02-26
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-clad optical fiber preform and its manufacturing method, which solves the problem that in the existing optical fiber manufacturing technology, the proportion of high-purity raw materials used in the outer cladding of the optical fiber preform is too large, resulting in high-purity raw materials Accounting for an excessively high proportion of the manufacturing cost of optical fiber, making the manufacturing cost of optical fiber high

Method used

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  • Prefabricated fiber rod with several clad layers and its fabrication
  • Prefabricated fiber rod with several clad layers and its fabrication
  • Prefabricated fiber rod with several clad layers and its fabrication

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Embodiment approach

[0048] The ratio of the outer diameter B of the inner cladding layer b to the outer diameter A of the core layer a is 1.0;

[0049] The ratio of the outer diameter C of the low-hydroxyl high-purity cladding c to the outer diameter A of the core layer a is 2.0;

[0050] The ratio of the outer diameter D of the high-purity outer cladding layer d to the outer diameter A of the core layer a is 5.0;

[0051] The ratio of the outer diameter E of the sub-high purity outer cladding layer e to the outer diameter A of the core layer a is 13.5;

[0052] Among them, the high-purity outer cladding d is made of high-purity SiCl with a content of 99.99% 4 Prepared, the sub-high purity outer cladding e is made of SiCl with a content of 99.9% 4 It is prepared, and the outer diameter E of the sub-high purity outer cladding e is 60mm.

[0053] The present invention adopts following implementation mode to be preferred implementation mode:

[0054] The ratio of the outer diameter B of the inne...

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Abstract

A multiclad layer optical fiber prefabricated rod includes core rod and outer clad layer; the core rod consists of core layer, inner clad layer and low-hydroxyl high-purity clad layer in sequence, and the outer clad layer includes a high-purity outer clad layer and a subhigh-purity outer clad layer. The fabrication process includes the successive steps of: making the core rod; the outside-pipe deposition of making high-purity outer clad layer on the surface of the core rod by using 99.99-99.999 % purity SiCl4 material to produce the prefabricated rod; and further making high-purity outer clad layer on the outer surface of the prefabricatd rod with 99-99.99% purity SiCl4 material by the same technological process. The present invention has low material cost, improved fiber performance, raised core rod making efficiency and capacity.

Description

technical field [0001] The invention relates to an optical fiber preform rod and a manufacturing method in the field of optical fiber manufacturing, in particular to a multi-clad optical fiber preform rod and a manufacturing method which are composed of several layers of quartz materials with slightly different purities and can be used for drawing silica optical fibers. technical background [0002] At present, the method for manufacturing commercial silica optical fiber preforms in the world is mainly chemical vapor deposition; wherein, typical manufacturing methods are OVD (outside vapor-phase deposition) technology and VAD (vapor-phase deposition) technology introduced in U.S. Pat. 3932162. axial deposition) process, the PCVD (plasma active chemical vapor-phase deposition) process described in Chinese patent 98813827.1 and the MCVD (modified chemical vapor-phase deposition) process as described in U.S. Patent U.S. Pat. 4217027. With the continuous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B20/00C03B37/012C03B37/014G02B6/00
CPCC03B2203/23C03B37/01413
Inventor 何珍宝童维军
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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