Digitalized Polarization Fading Suppression and Phase Demodulation Scheme of Phase-Sensitive Optical Time-Domain Reflectometry Based on Polarization Diversity Virtual Coherence
In this paper, a digitalized polarization fading suppression and phase demodulation technique for a phase-sensitive optical time-domain reflectometry (φ-OTDR) sensing system utilizing polarization diversity virtual coherence is proposed, in which virtual cross-coherence between the polarization dive...
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MDPI AG
2025-04-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/12/4/375 |
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| author | Xiatong Wu An Sun Yanming Liu Wei Ji |
| author_facet | Xiatong Wu An Sun Yanming Liu Wei Ji |
| author_sort | Xiatong Wu |
| collection | DOAJ |
| description | In this paper, a digitalized polarization fading suppression and phase demodulation technique for a phase-sensitive optical time-domain reflectometry (φ-OTDR) sensing system utilizing polarization diversity virtual coherence is proposed, in which virtual cross-coherence between the polarization diversity digital signals is employed for simultaneous fading noise suppression and phase demodulation. The principle of the proposed demodulation algorithm is presented and analyzed. Based on this, the practicability and validity of the proposed demodulation method for fading noise suppression and distributed vibration sensing are confirmed through experiments. The experimental results indicate that the proposed demodulation scheme can effectively reduce the polarization fading noise caused by the polarization mismatch between the probe light and the reference light, and the phase changes induced by external interference can also be accurately recovered with a signal-to-noise ratio (SNR) of vibration signal localization of 27.14 dB and an SNR of vibration signal phase demodulation of 47.88 dB, which provides a simplified method for simultaneous polarization fading suppression and the phase demodulation of the φ-OTDR system. |
| format | Article |
| id | doaj-art-a5a50d0bf8f94db0adb8a4ab236c4c53 |
| institution | DOAJ |
| issn | 2304-6732 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
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| series | Photonics |
| spelling | doaj-art-a5a50d0bf8f94db0adb8a4ab236c4c532025-08-20T03:13:55ZengMDPI AGPhotonics2304-67322025-04-0112437510.3390/photonics12040375Digitalized Polarization Fading Suppression and Phase Demodulation Scheme of Phase-Sensitive Optical Time-Domain Reflectometry Based on Polarization Diversity Virtual CoherenceXiatong Wu0An Sun1Yanming Liu2Wei Ji3School of Physics, Northwest University, Xi’an 710069, ChinaSchool of Physics, Northwest University, Xi’an 710069, ChinaState Key Laboratory of Rail Transit Engineering Informatization (FSDI), Xi’an 710043, ChinaSchool of Physics, Northwest University, Xi’an 710069, ChinaIn this paper, a digitalized polarization fading suppression and phase demodulation technique for a phase-sensitive optical time-domain reflectometry (φ-OTDR) sensing system utilizing polarization diversity virtual coherence is proposed, in which virtual cross-coherence between the polarization diversity digital signals is employed for simultaneous fading noise suppression and phase demodulation. The principle of the proposed demodulation algorithm is presented and analyzed. Based on this, the practicability and validity of the proposed demodulation method for fading noise suppression and distributed vibration sensing are confirmed through experiments. The experimental results indicate that the proposed demodulation scheme can effectively reduce the polarization fading noise caused by the polarization mismatch between the probe light and the reference light, and the phase changes induced by external interference can also be accurately recovered with a signal-to-noise ratio (SNR) of vibration signal localization of 27.14 dB and an SNR of vibration signal phase demodulation of 47.88 dB, which provides a simplified method for simultaneous polarization fading suppression and the phase demodulation of the φ-OTDR system.https://www.mdpi.com/2304-6732/12/4/375φ-OTDRpolarization fading suppressionphase demodulationpolarization diversity |
| spellingShingle | Xiatong Wu An Sun Yanming Liu Wei Ji Digitalized Polarization Fading Suppression and Phase Demodulation Scheme of Phase-Sensitive Optical Time-Domain Reflectometry Based on Polarization Diversity Virtual Coherence Photonics φ-OTDR polarization fading suppression phase demodulation polarization diversity |
| title | Digitalized Polarization Fading Suppression and Phase Demodulation Scheme of Phase-Sensitive Optical Time-Domain Reflectometry Based on Polarization Diversity Virtual Coherence |
| title_full | Digitalized Polarization Fading Suppression and Phase Demodulation Scheme of Phase-Sensitive Optical Time-Domain Reflectometry Based on Polarization Diversity Virtual Coherence |
| title_fullStr | Digitalized Polarization Fading Suppression and Phase Demodulation Scheme of Phase-Sensitive Optical Time-Domain Reflectometry Based on Polarization Diversity Virtual Coherence |
| title_full_unstemmed | Digitalized Polarization Fading Suppression and Phase Demodulation Scheme of Phase-Sensitive Optical Time-Domain Reflectometry Based on Polarization Diversity Virtual Coherence |
| title_short | Digitalized Polarization Fading Suppression and Phase Demodulation Scheme of Phase-Sensitive Optical Time-Domain Reflectometry Based on Polarization Diversity Virtual Coherence |
| title_sort | digitalized polarization fading suppression and phase demodulation scheme of phase sensitive optical time domain reflectometry based on polarization diversity virtual coherence |
| topic | φ-OTDR polarization fading suppression phase demodulation polarization diversity |
| url | https://www.mdpi.com/2304-6732/12/4/375 |
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