Polarization keeping optical fibre axis fixing method based on space diffracting light and device thereof

A technology of polarization-maintaining optical fiber and diffracted light, which is applied in the direction of measuring devices, clad optical fibers, optical waveguides and light guides, etc., to achieve the effect of improving the quality of devices, improving quality, and improving product quality

Inactive Publication Date: 2007-04-18
JINAN UNIVERSITY
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[0007] The method of the above patent is onl

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  • Polarization keeping optical fibre axis fixing method based on space diffracting light and device thereof
  • Polarization keeping optical fibre axis fixing method based on space diffracting light and device thereof
  • Polarization keeping optical fibre axis fixing method based on space diffracting light and device thereof

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[0056] The polarization-maintaining fiber used in the following embodiments is a panda-type polarization-maintaining fiber.

[0057] As shown in Figure 1, the laser beam 1 is perpendicular to the longitudinal axis of the polarization-maintaining fiber 5 and irradiates the side of the polarization-maintaining fiber 5 to form backscattered light 4. These backscattered lights interfere with each other in space and are captured by the imaging screen. Receiving, the diffraction images 3 can be seen through the reception of the imaging screen, and the characteristic quantities of these diffraction images have a corresponding one-to-one relationship with the polarization axis azimuth angle of the polarization maintaining fiber. 7 is the optical axis.

[0058] As shown in Figure 2, 1a and 1c are two stress areas, 1b is the core, and 1d is the cladding. This allows an acceptable diffraction image 3 to be formed on the observation surface 2 which is L from the center of the fiber. These dif...

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Abstract

The invention relates to polarization maintaining optical fiber axle fixing method based on space diffracted light. It collects back diffraction image of the space diffracted light to solve the problem of polarization maintaining optical fiber axle fixing, fixes the axle based on diffraction image characteristic quantity of which length, central position, and appearance are changed along with the rotating of the polarization maintaining optical fiber, or center image characteristic quantity of which change is more sensitive then the former. All of the parameters can be used as azimuth judging characteristic quantity. In addition the appearances of the diffraction image and center image have no symmetry at most positions which can be used to judge the azimuth of the polarization maintaining optical fiber polarizing axle more sensitively. The invention also relates to the adopted device, can more quickly search polarization maintaining optical fiber azimuth to increase axle fixing speed and precision.

Description

technical field [0001] The invention relates to a polarization-maintaining optical fiber axis fixing method and a device thereof based on space diffracted light. Background technique [0002] Polarization-maintaining fiber has been widely and deeply researched and applied in optical fiber communication and sensing systems due to its strong polarization-maintaining ability for linearly polarized light and excellent compatibility with general single-mode fibers. It has important applications in the production of interferometric fiber optic sensors, coherent fiber optic communications, and fiber optic gyroscopes. The realization of polarization maintaining performance is to introduce geometric asymmetry or stress in the radial direction of the fiber core to cause birefringence. The effect of this high birefringence is to counteract the birefringence caused by general environmental factors, so that the polarization state can be maintained. The usual way ...

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Application Information

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IPC IPC(8): G02B6/02G02B6/10G02B6/24G01M11/00
Inventor 陈哲张荣锋刘林和潘昊白春河
Owner JINAN UNIVERSITY
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