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A device and method for detecting geometric parameters of a panda-shaped polarization-maintaining optical fiber end face

A polarization-maintaining optical fiber and optical fiber end face technology, which is applied in measurement devices, optical devices, instruments, etc., to achieve the effects of high detection precision and accuracy, low cost, and fast detection speed.

Inactive Publication Date: 2015-12-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, most of the existing optical fiber end-face testers can only detect the stains on the end-face of optical fiber, and the optical fiber end-face testers developed by a few manufacturers are only for ordinary single-mode optical fibers.

Method used

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  • A device and method for detecting geometric parameters of a panda-shaped polarization-maintaining optical fiber end face
  • A device and method for detecting geometric parameters of a panda-shaped polarization-maintaining optical fiber end face
  • A device and method for detecting geometric parameters of a panda-shaped polarization-maintaining optical fiber end face

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The end-coupling light source adopts Yage Electric's YG-3717 high-power LED with a power of 0.5W and adjustable light intensity. The side-coupling light source adopts Yiming writing table lamp G4110, the lamp head can move freely, the adjustability is good, and the brightness is equivalent to 150W incandescent lamp. The fiber optic end-face microscope adopts TFN-450 three-dimensional adjustable desktop fiber optic microscope, which uses USB to connect to the computer and transmit data, and is small in size. The image processing software is completed using the vc6.0 development platform under the windows system.

[0052] The end face image of a panda-shaped polarization-maintaining fiber obtained by the above software and hardware platform is as follows: image 3 As shown, the test results are shown in Table 1 and Figure 4 as shown, Figure 4 The brightest circle in is the circle drawn according to the detection parameters. It can be seen from the figure that the det...

Embodiment 2

[0057] The software and hardware conditions are as in Example 1, and the end-face image of another polarization-maintaining optical fiber is selected for analysis, and the end-face image is as follows Figure 5 As shown, the test results are shown in Table 2 and Figure 6 shown.

[0058] Table 2 Test result table

[0059]

[0060] From the test results in Table 2, the diameter difference between the two cat's eyes is 5.6 pixels, which corresponds to 2.1um. It can be seen that there is a large difference in the diameters of the two cat's eyes. At this time, it is determined that the polarization-maintaining fiber has structural defects.

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Abstract

The invention discloses a geometrical parameter testing device and method used for panda-shaped polarization maintaining optical fiber end faces. Geometrical parameters of the panda-shaped polarization maintaining optical fiber end faces include centers of circles and diameters of a cladding layer, a fiber core and a cat eye. Light is coupled into different parts of optical fibers through different modes, so that gray-level distribution of each part of the optical fibers is different. An optical fiber end face microscope is utilized to acquire polarization maintaining optical fiber end face images and uploads the images to a computer, the geometric parameters of the polarization maintaining optical fiber end faces are obtained through a digital image processing method, so as to judge whether the polarization maintaining optical fibers have structural defects or not, and therefore, the geometrical parameters can be used for instructing device selection in production promotion and technique improvement and application. The geometrical parameter testing device and method is simple and compact in structure, low in cost, quick in testing speed and high in testing precision and accuracy, and can realize automatic testing.

Description

technical field [0001] The invention relates to the field of optical fiber sensing in optoelectronic technology, in particular to a device and method for detecting geometric parameters of a panda-shaped polarization-maintaining optical fiber end face. Background technique [0002] Polarization Maintaining Fiber (PMF, PolarizationMaintainingFiber) is a kind of special fiber with important application value. It has strong polarization maintaining ability for linearly polarized light and has good compatibility with ordinary single-mode fiber. It is widely used in aerospace, aviation , navigation, industrial manufacturing technology and communications and other fields of the national economy. In interferometric optical fiber sensors based on optical coherent detection, the use of polarization-maintaining optical fibers can ensure that the linear polarization direction remains unchanged, improve the coherent signal-to-noise ratio, and achieve high-precision measurement of physica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/24
Inventor 缪立军胡慧珠刘承舒晓武
Owner ZHEJIANG UNIV