High-Resolution φ-OFDR Using Phase Unwrap and Nonlinearity Suppression
- Resource Type
- Periodical
- Authors
- Guo, Z.; Yan, J.; Han, G.; Yu, Y.; Greenwood, D.; Marco, J.
- Source
- Journal of Lightwave Technology J. Lightwave Technol. Lightwave Technology, Journal of. 41(9):2885-2891 May, 2023
- Subject
- Communication, Networking and Broadcast Technologies
Photonics and Electrooptics
Spatial resolution
Optical fibers
Phase measurement
Wavelength measurement
Strain
Optical interferometry
Optical fiber sensors
Accuracy
distributed optical fibre sensor
phase-sensitive optical frequency domain reflectometer
resolution
- Language
- ISSN
- 0733-8724
1558-2213
Phase-sensitive optical frequency domain reflectometer ( φ -OFDR) is investigated to deliver an accurate distributed measurement with high spatial resolution. It is found that random phase noise and quadrant discrimination during phase calculation are the main reasons for the random hopping in φ -OFDR. By efficiently eliminating random hopping in the phase unwrap and suppressing the laser-induced nonlinear sweep for the theoretical spatial resolution, the proposed φ -OFDR is proved to be able to decouple the limitation between resolution and accuracy in coherent OFDR (C-OFDR). Distributed strain measurement with 20 mm spatial resolution in φ -OFDR is obtained and analysed. Measurement with little deviation and uniform sensitivity between applied strain and phase change both validate the efficient noise suppression for extreme resolution measurement. Then the influence of the initial sweep frequency between two times measurements is studied. With a further reduced 800 μm spatial resolution, the proposed φ -OFDR is able to retain accurate distributed measurement compared to conventional C-OFDR methods. Besides, the computation time of the φ -OFDR is only 3.2% of the C-OFDR.