Long-Range Distributed Vibration Sensing Based on Phase Extraction From Phase-Sensitive OTDR
Distributed fiber-optic vibration sensors based on phase-sensitive optical time-domain reflectometry ( <inline-formula> <tex-math notation="LaTeX">$\phi$</tex-math></inline-formula>-OTDR) have found many applications in various fields. In this paper, we analyze the...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IEEE
2016-01-01
|
| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/7458125/ |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Distributed fiber-optic vibration sensors based on phase-sensitive optical time-domain reflectometry ( <inline-formula> <tex-math notation="LaTeX">$\phi$</tex-math></inline-formula>-OTDR) have found many applications in various fields. In this paper, we analyze the phase noise of <inline-formula> <tex-math notation="LaTeX">$\phi$</tex-math></inline-formula>-OTDR, which is the main limiting factor of the measurement range. We found that the laser phase noise and phase extraction error caused by the intensity noise in photodetection contribute to the total phase noise. By introducing a series of auxiliary weak reflection points along the fiber, we develop a phase-noise-compensated <inline-formula> <tex-math notation="LaTeX">$\phi$</tex-math></inline-formula>-OTDR and realize a long-range distributed vibration sensing based on the phase extraction. Furthermore, a statistical analysis was proposed to maintain the vibration measurement sensitivity along the whole fiber. In the experiment, vibrations at 30 km were measured with a linear response, which confirmed the validity of our proposed system. |
|---|---|
| ISSN: | 1943-0655 |