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Polarization-fading suppression of Φ-OTDR with Rayleigh gray-scale pattern aggregation method.

Yu Wang, Lin Xiao, Yan Li

|November 22, 2021

Summary

This summary is machine-generated.

A new area-to-area signal aggregation method using a Rayleigh gray-scale pattern effectively suppresses polarization fading in Φ-optical time domain reflectometer (Φ-OTDR) systems. This technique significantly reduces signal discontinuity and improves signal-to-noise ratio for reliable measurements.

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Area of Science:

Photonics and Optical Sensing
Signal Processing
Image Analysis

Background:

Polarization fading in Φ-optical time domain reflectometer (Φ-OTDR) systems degrades measurement accuracy.
Traditional polarization diversity reception methods suffer from signal discontinuity due to point-to-point aggregation.
This discontinuity hinders subsequent data processing and applications.

Purpose of the Study:

To propose and validate an area-to-area signal aggregation method for reducing signal discontinuity in Φ-OTDR.
To enhance polarization fading suppression using a Rayleigh gray-scale pattern.
To improve the reliability and performance of Φ-OTDR systems.

Main Methods:

Simulation of Rayleigh patterns to confirm large-scale fading area continuity.
Image processing techniques including normalization, graying, Otsu algorithm for thresholding, erosion, and dilation.
Multichannel area-to-area signal aggregation using the developed Rayleigh gray-scale pattern method.

Main Results:

Reduced average fading ratio from 6.58% to 2.10%.
Achieved signal demodulation with a signal-to-noise ratio (SNR) of 15.83 dB for the positioning curve.
Demonstrated effective suppression of polarization fading in Φ-OTDR.

Conclusions:

The proposed area-to-area aggregation method effectively mitigates signal discontinuity.
This approach provides a robust solution for polarization fading suppression in Φ-OTDR.
The method enhances the overall performance and applicability of Φ-OTDR systems.