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Method for demodulating polarization maintaining optical fiber polarization coupling point position based on multimodal division cycle

A polarization-maintaining fiber and split-period technology, applied in the field of optical measurement, can solve problems such as the drop in spatial resolution of the polarization-maintaining fiber coupling point, and achieve the effects of reducing the influence of birefringence dispersion, improving spatial resolution, and strong practicability

Inactive Publication Date: 2014-08-27
TIANJIN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the spatial resolution of the coupling point of the polarization-maintaining fiber decreases with the length of the fiber due to the influence of birefringence dispersion in the polarization-maintaining fiber, and provide a method of demodulating the position of the polarization-coupling point of the polarization-maintaining fiber based on the multi-peak splitting period Methods

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  • Method for demodulating polarization maintaining optical fiber polarization coupling point position based on multimodal division cycle
  • Method for demodulating polarization maintaining optical fiber polarization coupling point position based on multimodal division cycle
  • Method for demodulating polarization maintaining optical fiber polarization coupling point position based on multimodal division cycle

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Embodiment 1

[0041] The specific process of demodulating the position of the polarization coupling point of the polarization maintaining fiber based on the multi-peak splitting period.

[0042] The experimental parameters are as follows: the fiber length is L =396m, the length of the fiber jumper is 4.07m, and the refractive index difference between the two polarization axes of the fiber is , the central wavelength and spectral width of the light source are 1315nm and 30.08nm, respectively.

[0043] 1) Periodically extract the multi-peak split fringes collected by the detector.

[0044] In the experiment, the multi-peak splitting phenomenon in the superposition area of ​​interference fringes of two polarization coupling points located at 399.57m and 400.07m, 399.34m and 400.07m, 399.74m and 400.07m was respectively detected, and the package of split peaks in the superposition area was extracted The network is fitted with multiple peaks, and the results are as follows Figure 4 shown. ...

Embodiment 2

[0053] In this embodiment, a 964m polarization-maintaining optical fiber is tested, and the experimental parameters are as follows: the length of the optical fiber is L =964m, the length of the fiber jumper is 4.07m, and the refractive index difference between the two polarization axes of the fiber is , the central wavelength and spectral width of the light source are 1315nm and 30.08nm, respectively.

[0054] In the experiment, the multi-peak splitting phenomenon of the superposition area of ​​interference fringes of two polarization coupling points located at 964m and 965.07m, 966.02m and 968.04m, 964m and 966.02m, 967.54m and 968.04m were respectively detected, and the superposition area was extracted Split the envelope of the peak, and fit multiple peaks to it, the result is as follows Figure 5 As shown, the beat frequency demodulation results are shown in Table 2. It can be seen from the table that when the positions or intervals of the polarization coupling points ar...

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Abstract

Disclosed is a method for demodulating the polarization maintaining optical fiber polarization coupling point position based on a multimodal division cycle. An SLD broadband light source is adopted by the method to build a polarization maintaining optical fiber polarization coupling test system based on the Michelson, light emitted by a light source is coupled into a polarization maintaining optical fiber through a polarizer to form excitation modes, part of excitation modes are interfered to orthogonal coupled modes for transmission through the coupling point in the optical fiber, the optical path difference of the excitation modes and the coupled modes is formed, and a Michelson interferometer is adopted to balance the optical path difference to form interference. According to the demodulating step of interference signals, cycle extraction is performed on multimodal division stripes collected by a detector; the multimodal division stripe cycle is utilized for calculating the opposite position and the spatial resolution of the polarization coupling point. The multimodal division cycle in the interference stripes is demodulated to obtain the opposite position of the polarization coupling point, the spatial resolution of the polarization coupling point is improved, and the birefringence dispersion influence of the polarization maintaining optical fiber is reduced. The method is simple and practical and has the higher practicability.

Description

technical field [0001] The invention relates to a method for demodulating the position of a polarization-maintaining fiber polarization coupling point by using a multi-peak splitting interferogram, in particular utilizing the multi-peak splitting phenomenon of a polarization-maintaining fiber and utilizing the cycle of multi-peak splitting to demodulate the position of a fiber coupling point, thereby improving the polarization-maintaining fiber The invention relates to the spatial resolution of coupling points, belonging to the technical field of optical measurement. Background technique [0002] As a special fiber that can maintain the polarization state of the transmitted light, the polarization-maintaining fiber can generate inherent birefringence in the fiber by introducing inherent internal stress inside the fiber or changing the geometry of the fiber, thereby eliminating the influence of perturbative birefringence on the polarization state of the transmitted light. Rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/00
Inventor 张红霞任亚光贾大功刘铁根张以谟
Owner TIANJIN UNIV
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