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Polarization maintaining optical fiber axial strain-birefringence coefficient measurement system and measurement and calculation method

A polarization-maintaining optical fiber and axial strain technology, which is applied in the field of axial strain-birefringence measurement system, can solve the problems of inability to realize polarization-maintaining optical fiber measurement and error exclusion, and achieve the goal of reducing measurement errors and reducing possibilities Effect

Active Publication Date: 2017-04-19
HEBEI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some methods that have been proposed that can measure the birefringence of polarization-maintaining fibers and are expected to be used to measure the axial strain-birefringence index of polarization-maintaining fibers are basically unable to measure this parameter for a specific section of polarization-maintaining fibers, because In these methods, the optical fiber to be tested must be inserted into the measurement system (usually a jumper connection or fusion splicing) and then measured and calculated by stretching. Eliminate the errors introduced by fiber optic fixtures, etc.

Method used

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  • Polarization maintaining optical fiber axial strain-birefringence coefficient measurement system and measurement and calculation method
  • Polarization maintaining optical fiber axial strain-birefringence coefficient measurement system and measurement and calculation method
  • Polarization maintaining optical fiber axial strain-birefringence coefficient measurement system and measurement and calculation method

Examples

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Embodiment 1

[0106] Example 1: Axial strain-birefringence measurement of Panda-type polarization-maintaining optical fiber (manufactured by Wuhan Changfei Company, model PM1550_125-18 / 250)

[0107] The polarization-maintaining fiber to be tested is the PM1550_125-18 / 250 panda-type polarization-maintaining fiber produced by Wuhan Changfei Company, and its cross-sectional schematic diagram is as follows: Figure 7 shown. The axial strain-birefringence index γ of the optical fiber is measured by using the polarization-maintaining optical fiber axial strain-birefringence index measuring system and method of the present invention. The 7.24m Panda fiber to be tested is used to replace the 103 part of the polarization-maintaining fiber to be tested in the invention, the stretching step is controlled at about 130με, and the maximum strain is not more than 2500με. A total of 19 groups of polarization-maintaining fiber birefringence Δn and strain Δε are obtained. The data; the birefringence change ...

Embodiment 2

[0108] Embodiment 2: Axial strain-birefringence measurement of bow-tie polarization-maintaining optical fiber (manufactured by FIBERCORE, model HB-1500G-SB)

[0109] The difference between this embodiment and Embodiment 1 is that the polarization-maintaining optical fiber 103 to be tested in the invention is replaced by a 6.54m HB-1500G-SB bow-tie type polarization-maintaining optical fiber. The cross-sectional schematic diagram of the optical fiber is as follows Figure 9 shown. In the measurement experiment, the stretching step length of the bow-tie polarization-maintaining fiber to be tested was controlled at about 150με, and the maximum strain did not exceed 2500με. A total of 16 sets of data on the relationship between the birefringence Δn and the strain Δε of the polarization-maintaining fiber were obtained; δ Δn Plotting the relationship data about the change of axial strain Δε, the result is as follows Figure 8 As shown in the figure, the experimental data is linear...

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Abstract

The invention discloses a polarization maintaining optical fiber axial strain-birefringence coefficient measurement system and measurement and calculation method. The system comprises a distributed polarization crosstalk analysis system, an output polarization maintaining optical fiber, a polarization maintaining optical fiber to be measured, an input polarization maintaining optical fiber, a first optical fiber strain adjusting frame, a second optical fiber strain adjusting frame, a first reading microscope with a pointer and a second reading microscope with a pointer. The output port of the distributed polarization crosstalk analysis system is connected with the first end of the output polarization maintaining optical fiber. The second end of the input polarization maintaining optical fiber is connected with the input port of the distributed polarization crosstalk analysis system. The second end of the output polarization maintaining optical fiber is connected with the first end of the polarization maintaining optical fiber to be measured, and a first preset crosstalk peak is introduced to the connecting part of the output polarization maintaining optical fiber and the polarization maintaining optical fiber to be measured. The second end of the polarization maintaining optical fiber to be measured is connected with the first end of the input polarization maintaining optical fiber, and a second preset crosstalk peak is introduced to the connecting part of the polarization maintaining optical fiber to be measured and the input polarization maintaining optical fiber.

Description

technical field [0001] The invention relates to the field of measurement of polarization-maintaining optical fiber parameters, in particular to a measurement system and a measurement and calculation method of axial strain-birefringence coefficient of polarization-maintaining optical fiber. Background technique [0002] Polarization-maintaining fiber (also known as polarization-maintaining fiber) is a special fiber that artificially introduces high birefringence. It is usually made by adding a stress zone to the fiber cladding, so that the fiber core is in two directions perpendicular to each other in the transverse direction. There are different refractive indices, among which the high refractive index is called the slow axis, and the low refractive index is called the fast axis, so that the polarization state of the linearly polarized light waves transmitted along the two directions in the fiber can remain unchanged during the transmission process. Polarization maintaining ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02G01M11/00G01B11/16
CPCG01B11/16G01M11/00G01M11/0228G01M11/30
Inventor 冯亭丁东亮姚晓天
Owner HEBEI UNIVERSITY