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Method for producing optical fibre precast product, optical fibre precast product and relative optical fibre

A technology for optical fiber preforms and preforms, which is applied in the manufacture of optical fiber preforms and can solve problems such as fragility of sleeves

Inactive Publication Date: 2009-02-18
DRAKA COMTEQ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, because of its mechanical properties, the sleeve must maintain a minimum thickness below which it risks becoming too fragile

Method used

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  • Method for producing optical fibre precast product, optical fibre precast product and relative optical fibre

Examples

Experimental program
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Embodiment Construction

[0028] see figure 1 , whose center is core 1 of the final preform. The optical core 1 is obtained by VAD or OVD. The optical core 1 is surrounded by an optical cladding 2 . The optical cladding 2 is obtained by VAD or OVD. The optical cladding 2 contacts the optical core 1 . The optical core 1 and the optical cladding 2 together form a primary preform 3 . The optical cladding 2 and the primary preform 3 are surrounded by and contact a thin sleeve tube 4 . The thin sleeve 4 has a smaller thickness than the thick sleeves conventionally used for casing primary preforms obtained by VAD or OVD and is therefore less thick, and preferably smaller. The sleeve 4 is made of pure silica, ie silica without any impurities. This pure silica may be doped or undoped, preferably synthetic silica. The sleeve 4 is surrounded by and contacts a structural layer 5 made of silica granules. This structural layer 5 can be homogeneous or, depending on the type of fiber, can consist of several s...

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PUM

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Abstract

The invention relates to the field of optical fibres, to optical-fibre preforms and to processes for producing a final optical-fibre preform obtained by plasma built-up on a primary preform. <??>The invention relates especially to a final optical-fibre preform comprising a primary preform (3) comprising optical core and cladding material, obtained by a VAD deposition process or an OVD deposition process, a silica sleeve tube (4) surrounding the primary preform (3), and a built-up layer (5) made of silica particles surrounding the silica sleeve tube (4). <IMAGE>

Description

technical field [0001] The present invention relates to optical fibers, optical fiber preforms and methods for producing final optical fiber preforms by performing plasma bulit-up on primary preforms. Background technique [0002] There are already several classes of methods of obtaining primary preforms, grouped into: techniques with tubes, CVD (Chemical Vapor Deposition) type, depositing material on the inside of tubes, tubeless techniques, VAD (Vapor Axial Deposition) type, axial To deposit material, OVD (Outside Vapor Deposition) type, deposit material on the outside of the mandrel. The present invention does not relate to tube-based techniques, ie CVD-type techniques, using tubes to obtain primary preforms. The invention relates to a tubeless technique, ie of the VAD or OVD type, for obtaining primary preforms. [0003] Unpublished European patent application EP 1,388,525 relates to a method of manufacturing preforms comprising the steps of covering a rod having at le...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/13C03B37/012H04B10/12G02B6/00C03B37/014C03B37/018G02B6/44
CPCC03B37/01291C03B37/01211C03B37/014C03B37/012C03B37/018
Inventor 让·弗洛朗·康皮翁伊莎贝尔·德科维尔日妮·埃尔许尼尔兹
Owner DRAKA COMTEQ BV