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Analysis on real-time phase delay in an interferometric FBG sensor array using polarization switching and the PGC

Lina Ma, Yi Yu, Jun Wang

|August 6, 2020

Summary

This summary is machine-generated.

This study introduces a compensation method to improve the polarization switching and phase generated carrier (PS-PGC) hybrid technique for fiber Bragg grating sensors. The new approach enhances demodulation accuracy and reduces background noise in sensor arrays.

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Area of Science:

Optoelectronics and Photonics
Fiber Optic Sensing Technology
Signal Processing for Optical Sensors

Background:

The polarization switching and phase generated carrier (PS-PGC) hybrid method is crucial for managing signal fading caused by fiber birefringence in interferometric fiber Bragg grating (FBG) sensor arrays.
Real-time phase delay in the PS-PGC hybrid method can negatively impact demodulation accuracy and increase background noise, potentially compromising the effectiveness of the polarization switching (PS) technique.

Purpose of the Study:

To analyze the real-time phase delay in the PS-PGC hybrid method and propose a compensation strategy.
To investigate the impact of real-time phase delay on the interference complex synthesis (ICS) and the overall PS-PGC algorithm accuracy.

Main Methods:

Detailed theoretical analysis of real-time phase delay effects within the PS-PGC hybrid method.
Development and presentation of a method to demodulate real-time phase delay from sampled interference data.
Experimental validation of the proposed compensation method.

Main Results:

The real-time phase delay was identified as a significant source of error in the PS-PGC algorithm, primarily affecting the ICS procedure.
The compensation method effectively improved demodulated signal stability, reducing amplitude fluctuations to less than ±0.75 dB.
Significant background phase noise suppression of 5 dB was achieved using the compensation technique.

Conclusions:

The developed compensation method successfully mitigates the adverse effects of real-time phase delay in the PS-PGC hybrid technique.
This approach enhances the reliability and accuracy of signal demodulation in FBG sensor arrays.
The findings contribute to more stable and precise optical sensing applications.