Hybrid B-OTDR/Φ-OTDR for multi-parameter measurement from a single end of fiber

Zhou，Xiao1,2; Wang，Feng1,2; Liu，Zhen1; Lu，Yanqing1; Yang，Chengyu1; Zhang，Yixin1,3; Shao，Liyang4; Zhang，Xuping1,3

2022-08-01

10.1364/OE.463127

OPTICS EXPRESS   Impact Factor & Quartile

1094-4087

1094-4087

The multi-parameter sensing is in great demand for comprehensive recognition in various application scenarios. We demonstrate a distributed optical fiber sensor (DOFS) for simultaneous vibration and temperature/strain sensing based on the integration of Brillouin optical time-domain reflectometry (BOTDR) and phase-sensitive optical time-domain reflectometry (Φ-OTDR). A double heterodyne detection configuration is set up to receive the Rayleigh scattering and Brillouin scattering simultaneously, which can enhance the signal-to-noise ratio (SNR) and reduce the polarization fading noise for the Brillouin signal at the same time. Most components in the setup are multiplexed for the Brillouin and Rayleigh signals. The overall cost is much lower than the summation of the BOTDR and the Φ-OTDR setup. In experiments, the setup is capable of measuring temperature change near the end of the 49.9 km long fiber with 0.381 MHz measurement uncertainty and restore different vibration patterns correctly by demodulating the phase variation of Rayleigh scattering signal, owning a 20 m spatial resolution. The sampling rate of the vibration measurement is 1.8 kHz, and the achieved dynamic strain resolution is 1.235 nε/√Hz with 100 Hz vibration.

SCI ; EI

English

Others

National Natural Science Foundation of China[61975076];National Natural Science Foundation of China[62175100];National Natural Science Foundation of China[U2001601];

Optics

Optics

WOS:000836698500071

Optica Publishing Group

20223112464679

Brillouin scattering ; Heterodyne detection ; Optical fibers ; Permittivity measurement ; Reflection ; Reflectometers ; Signal to noise ratio ; Uncertainty analysis

Electromagnetic Waves:711 ; Information Theory and Signal Processing:716.1 ; Light/Optics:741.1 ; Fiber Optics:741.1.2 ; Probability Theory:922.1 ; Optical Instruments:941.3 ; Electric Variables Measurements:942.2

PHYSICS

2-s2.0-85135072486

Scopus

1.Key Laboratory of Intelligent Optical Sensing and Manipulation,Ministry of Education,College of Engineering and Applied Sciences,Nanjing University,Nanjing,210023,China
2.Nanjing University,Tongding Joint Lab for Large-scale Photonic Integrated Circuits,Nanjing University,Nanjing,210023,China
3.Shenzhen Research Institute of Nanjing University,Shenzhen,518063,China
4.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Zhou，Xiao,Wang，Feng,Liu，Zhen,et al. Hybrid B-OTDR/Φ-OTDR for multi-parameter measurement from a single end of fiber[J]. OPTICS EXPRESS,2022,30(16):29117-29127.

Zhou，Xiao.,Wang，Feng.,Liu，Zhen.,Lu，Yanqing.,Yang，Chengyu.,...&Zhang，Xuping.(2022).Hybrid B-OTDR/Φ-OTDR for multi-parameter measurement from a single end of fiber.OPTICS EXPRESS,30(16),29117-29127.

Zhou，Xiao,et al."Hybrid B-OTDR/Φ-OTDR for multi-parameter measurement from a single end of fiber".OPTICS EXPRESS 30.16(2022):29117-29127.