Affiliation:
1. Shenzhen Research Institute of China University of Geosciences
2. Huazhong University of Science and Technology
3. Yangtze Optical Fibre and Cable Joint Stock Limited Company
4. Fiberhome Fujikura Optic Technology Co.
5. Southern University of Science and Technology
Abstract
A low-complexity multi-subcarrier pulse generation scheme is proposed to suppress the interference fading in a phase-sensitive optical time-domain reflectometer (Φ-OTDR) based distributed acoustic sensor (DAS) with heterodyne coherent detection. The multi-subcarrier pulse is generated in the digital domain based on the proper clipping operation of a sine signal. The localization and recovery of the disturbance signal are realized by the spectrum extraction and rotated vector sum (SERVS) method. The experimental results show that the occurrences of interference fading can be significantly reduced. The intensity fluctuation is reduced from ∼75 dB to ∼25 dB. Multiple disturbance signals are successfully demodulated to verify the effectiveness of the proposed method.
Funder
Wuhan National Laboratory for Optoelectronics
Fundamental Research Funds for Central University China University of Geosciences
Postdoctoral Fellowship Program of CPSF
Key R&D Program of Hubei Province
Technology Innovation Project of Hubei Province
Basic and Applied Basic Research Foundation of Guangdong Province
Science and Technology Project of Wuhan
National Natural Science Foundation of China