Jinfeng Gu, Bin Lu, Junqi Yang, Zhaoyong Wang, Lei Ye, Qing Ye, Ronghui Qu, Haiwen Cai. Distributed Acoustic Sensing Based on Multi-Core Fiber[J]. Acta Optica Sinica, 2021, 41(7): 0706003
- Acta Optica Sinica
- Vol. 41, Issue 7, 0706003 (2021)
Fig. 1. Schematic of phase-demodulated Φ-OTDR structure based on heterodyne coherent detection
Fig. 2. Simulated interference fading of signals in different cores
Fig. 3. Relationship between the SNR improvement and number of diversity
Fig. 4. Experimental setup of distributed acoustic sensing based on a multi-core fiber
Fig. 5. Relationship between the differential phase of one core and four cores and distance
Fig. 6. Differential phase of the aggregated signal in four cores at the disturbance location
Fig. 7. PSD of SMF and MCF at the frequency of 2.5 kHz
Fig. 8. PSD between SMF, one core and four cores in MCF at the disturbance location
Fig. 9. PSD between one core and four cores in MCF with the 8 kHz disturbance frequency
Fig. 10. PSD between each core and four cores in MCF without disturbance
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Table 1. Parameters of seven-core fiber
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Table 2. Parameters of the fan-in and fan-out module
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