Lina Ma, Yu Chen, Zhengliang Hu, Jinxing Huang, Jun Wang, Shiqing Li. An interferometric phase shift fiber Bragg grating sensing system with greatly reduced background phase noise[J]. Chinese Optics Letters, 2018, 16(9): 090601
- Chinese Optics Letters
- Vol. 16, Issue 9, 090601 (2018)
Fig. 1. Schematic diagram of the PS-FBG sensing system.
Fig. 2. Index modulation profile of PS-FBG.
Fig. 3. Output spectra of the PS-FBG sensing system.
Fig. 4. FWHM bandwidth versus (a) phase shift and (b) index modulation amplitude.
Fig. 5. (a) Wavelength shift with a strain modulation from 0 to 1 με
Fig. 6. Simulated phase noise with an OPD of 10 mm and Δ λ
Fig. 7. Simulated results of phase noise at 1 kHz versus OPD when Δ λ
Fig. 8. Measured spectra of the (a) transmission of the PS-FBGs and (b) output.
Fig. 9. (a) The experimental setup for OPD measurements and (b) measured results.
Fig. 10. (a) Measured interference in the time (upper) and frequency (lower) domains and (b) demodulated phase noise level.
Fig. 11. (a) Phase noise level with different OPDs, and (b) phase noise at 1 kHz.
Fig. 12. Measured phase noise level with an interrogation interferometer OPD of (a) 6.8 mm and (b) 10.9 mm.
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Table 1. Parameters Used in Simulation
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