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How to make an optical fiber

A manufacturing method and optical fiber technology, which is applied in the field of optical fiber manufacturing, can solve problems such as the deviation of optical fiber characteristic values, and achieve the effect of increasing product yield and reducing costs

Active Publication Date: 2016-11-02
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, this method is effective for an optical fiber preform whose refractive index profile is uniform in the longitudinal direction, but in the case of an optical fiber preform whose optical fiber properties fluctuate in the longitudinal direction, similar to the invention described in Patent Document 1, the optical fiber properties Values ​​may deviate from

Method used

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  • How to make an optical fiber
  • How to make an optical fiber
  • How to make an optical fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0042] use figure 1 The device shown performs fiber drawing. The prepared optical fiber base material is made of SiO doped with Ge 2 Core, and SiO 2 The dispersion-shifted fiber base material formed by the cladding has a target cut-off wavelength of 1380±40nm and a target wavelength dispersion of ≤5.8ps / nm / km. Preliminarily use a preform tester to measure the refractive index profile of the five locations (A1~A5) of the optical fiber base material, and use figure 2 The estimated value of cutoff wavelength at all measurement points is calculated as the drawing tension of 1380±40nm, and the drawing is performed with the obtained drawing tension.

[0043] The estimated values ​​of cutoff wavelength and wavelength dispersion at each position in the length direction of the optical fiber base material obtained from the measurement results measured by the preform tester are shown in Table 1. According to the sample fiber collected at the beginning of the drawing Calculate the deviation...

Embodiment 2

[0054] use figure 1 The device shown performs fiber drawing. The optical fiber base material is the same as in Example 1. It is made of Ge-doped SiO 2 Core, and SiO 2 For the dispersion-shifted fiber base material formed by the cladding, the target cut-off wavelength is 1360±60nm, and the target wavelength dispersion is ≤5.8ps / nm / km. Preliminarily use a preform tester to measure the refractive index profile of the five locations (A1~A5) of the optical fiber base material, and use figure 2 The estimated value of cutoff wavelength at all measurement points is calculated as the drawing tension of 1360±60nm, and the drawing is performed with the obtained drawing tension.

[0055] The estimated values ​​of cutoff wavelength and wavelength dispersion at each position in the length direction of the optical fiber base material obtained from the measurement results measured by the preform tester are shown in Table 5. According to the sample fiber collected at the beginning of the drawing ...

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Abstract

In the present invention an optical fiber is manufactured by drawing a wire by going through the following steps: an optical fiber characteristic prediction step for measuring, in at least two locations in the longitudinal direction, the diffraction rate distribution of the cross-sectional radial direction of an optical fiber base material prior to wire drawing, and calculating and predicting at least two optical fiber characteristics of the longitudinal direction on the basis of the measured diffraction rate distribution; a sample fiber characteristic measurement step for collecting sample fibers from the wire drawing start-end or the wire drawing start-end and a point along the wire drawing, and measuring at least two optical fiber characteristics of the collected sample fibers; an optical fiber characteristic correction step for correcting fluctuations in the longitudinal direction of the at least two optical fiber characteristics calculated in the optical fiber characteristic prediction step, on the basis of the optical fiber characteristics of the sample fibers measured in the sample fiber characteristic measurement step; and a wire drawing tension adjustment step for determining wire drawing tension so that the at least two optical fiber characteristics subsequent to the sample fiber collection positions are all within a favorable range in the longitudinal direction, and for adjusting the wire drawing tension.

Description

Technical field [0001] The present invention relates to a method for manufacturing an optical fiber that draws an optical fiber while heating and melting an optical fiber base material. Background technique [0002] Optical fibers used in optical communications and the like are obtained by heating and melting an optical fiber base material in a heating furnace and drawing it. The drawn optical fiber preferably satisfies desired optical fiber characteristics over the entire length in the longitudinal direction and has uniform characteristics. Therefore, use a preform analyzer (Preform Analyzer) to measure the refractive index distribution of the optical fiber base material to calculate and predict the characteristic values ​​of the optical fiber such as the cut-off wavelength to confirm whether these characteristics become the expected value, and to enter the expected value range. The drawing conditions for drawing. [0003] For example, Patent Document 1 describes a technique in w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/027
CPCC03B37/0253C03B2205/40C03B2205/72Y02P40/57
Inventor 伊藤辉彦山本义典石原朋浩川崎希一郎田村拓史
Owner SUMITOMO ELECTRIC IND LTD