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Method for measuring retaining stress double-refraction value of stress deflection fibre-optical

A technology of stress birefringence and polarization maintaining optical fiber, which is applied in the direction of testing optical performance, electromagnetic wave transmission system, electrical components, etc.

Inactive Publication Date: 2005-03-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no measurement method applicable to various types of polarization-maintaining fibers that can reflect the relationship between doping concentration, stress element shape and stress birefringence.

Method used

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  • Method for measuring retaining stress double-refraction value of stress deflection fibre-optical
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  • Method for measuring retaining stress double-refraction value of stress deflection fibre-optical

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specific Embodiment approach 1

[0012] Specific implementation mode one: the following combination figure 2 This embodiment will be specifically described. The technical measure of the present invention comprises the following steps: (1) measurement of dopant element concentration: take the polarization-maintaining optical fiber preform as raw material, adopt crystal cutting knife to transversely cut it into discs with a thickness of 2mm-5mm, the release of stress makes Many microcracks are produced in the stress area of ​​the wafer; then take out the samples of the stress area and the core area respectively, measure the content of the B element in the stress area sample, and measure the content of the Ge element in the core area sample; determine the stress at the same time as the doping element concentration measurement The geometry of the region and the core region: Take the polarization-maintaining fiber, cut it with a fiber cutter to cut a few small pieces of optical fiber as samples, keep the cut end ...

specific Embodiment approach 2

[0043] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step (1), the content of B element in the stress region is measured by volumetric method, and the content of Ge element in the core region is analyzed by atomic fluorescence spectrometry. When determining the geometry of the stress region and the core region, a total of 5-10 small pieces of optical fiber were cut to make samples. In order to prevent the foaming and expansion of the glue, keep the temperature below 20°C. In step (2), use Paintshop, Photoshop, Microsoft Photo Editor or Windows drawing tool to clean up the impurities in the backscattered atomic contrast image. Other steps are the same as the first embodiment.

specific Embodiment approach 3

[0044] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in step (1), the end face of the optical fiber segment is sprayed with carbon, copper, gold or platinum as a conductive film. The contents of B and Ge were measured by ICP-AES method. Other steps are the same as those in Embodiment 1.

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Abstract

The invention is a measuring method for fiber stress double-refraction value of stress deflection and maintaining fiber in fiber interference communication and fiber sensor fields. The technology includes following steps: selects out the samples in stress area and core area, measures the content of B element in stress sample, measures the content of element Ge in core area; plates conductive film with thickness from 1 micron to 2 micron on the end surface of the fiber, scans the surface used as the atom lining by the electron probe device and carries on line scan to the Ge element, eliminates the impurities and spots on the surface; the image is inputted into the MATLAB project software, works out the stress double-refraction value through stress double-refraction formula and stress area impurities density.

Description

Technical field: [0001] The invention relates to the processing technology of the polarization-maintaining optical fiber used in the field of optical fiber coherent communication and optical fiber sensor, in particular to a method for measuring the stress birefringence value of the stress-induced polarization-maintaining optical fiber. Background technique: [0002] The polarization-maintaining optical fiber used in coherent optical communication and interferometric fiber optic sensors can maintain a stable polarization state throughout the length of the fiber, resisting changes in the optical polarization state caused by changes in the external environment, so as to improve the sensitivity and sensitivity of signal transmission and detection. precision. At present, there are mainly three kinds of practical stress-induced polarization-maintaining fibers: bow-tie type, panda type and elliptical cladding type. Such as figure 1 The structure of several polarization-maintainin...

Claims

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Application Information

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IPC IPC(8): G01M11/02
Inventor 李美成刘礼华肖天鹏赵连城
Owner HARBIN INST OF TECH
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