Device and method for eliminating polarization fading in ofdr

A technology for eliminating polarization and maintaining polarization fiber, which is applied in the direction of using optical devices to transmit sensing components, which can solve the problem of unstable polarization fading suppression effect, and achieve the effect of eliminating polarization fading phenomenon, improving accuracy and good measurement stability.

Active Publication Date: 2021-06-04
武汉昊衡科技有限公司
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Problems solved by technology

However, the optical path needs to be adjusted in the early stage, and when the external environment changes, the best matching polarization state of the reference light and the signal light may change, thus making the effect of suppressing polarization fading unstable

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  • Device and method for eliminating polarization fading in ofdr
  • Device and method for eliminating polarization fading in ofdr
  • Device and method for eliminating polarization fading in ofdr

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Embodiment Construction

[0034] The following embodiments will further describe the present invention in conjunction with the accompanying drawings.

[0035] Such as figure 1 As shown, the device for eliminating polarization fading in OFDR in the embodiment of the present invention includes a linear frequency-sweeping laser 1, a polarization-maintaining fiber beam splitter 2, a main interferometer 3, an auxiliary interferometer 4, a data acquisition card 5, and a computer 6, wherein:

[0036] The linear frequency-sweeping laser is used to emit a linearly polarized laser whose laser wavelength changes periodically and linearly, and the polarization state is aligned with the slow axis and cut off with the fast axis;

[0037] The polarization-maintaining fiber beam splitter is used to divide the frequency-sweeping laser into two paths, which respectively enter the auxiliary interferometer and the main interferometer;

[0038] The main interferometer is used to cause the frequency-sweeping laser entering...

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Abstract

The invention relates to a device and method for eliminating polarization fading in OFDR. The device includes a linear frequency sweep laser, a polarization-maintaining fiber beam splitter, a main interferometer, an auxiliary interferometer, a data acquisition card and a computer. The main interferometer is used to make the incoming The frequency-sweeping laser of the main interferometer undergoes beat-frequency interference to generate a first beat-frequency signal; the auxiliary interferometer causes the frequency-sweeping laser entering the auxiliary interferometer to undergo beat-frequency interference to generate a second beat-frequency signal. After the signal is converted, it is used as the external clock of the high-speed data acquisition card; the data acquisition card samples the first beat frequency signal at intervals in the frequency domain under the trigger of the external clock. The invention uses polarization-maintaining optical fiber and polarization-maintaining optical fiber devices in the main optical path, the main interferometer and the optical fiber to be tested. Therefore, in the optical path of the main interferometer, the polarization state of the interference signal is strictly controlled so that the slow axis is aligned and the fast axis is cut off, so that the phenomenon of polarization fading is fundamentally eliminated. The stability and accuracy of the device are significantly improved in breakpoint detection, loss measurement and distributed temperature strain sensing.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, more specifically, to a device and method for eliminating polarization fading in OFDR. Background technique [0002] OFDR technology is a distributed optical fiber measurement and sensing technology widely used in optical communication, aerospace, civil engineering, energy and power and other fields. The single-mode optical fiber in the OFDR system has birefringence, which will cause the polarization state of the output light in the optical fiber link to fluctuate, resulting in polarization fading. The basic principle of OFDR technology is optical heterodyne detection, which is to obtain the beat frequency interference signal of signal light and reference light. The specific performance of the polarization fading phenomenon is that the amplitude of the beat frequency interference signal of the signal light and the reference light fluctuates randomly, and even the beat frequency int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353
CPCG01D5/353
Inventor 王辉文张晓磊温永强
Owner 武汉昊衡科技有限公司
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