Fan Zhang, Beibei Qi, Baijin Su, Ou Xu, Yuwen Qin. High sensitivity all-fiber bend sensor based on modal interferences in a ring core fiber[J]. Chinese Optics Letters, 2023, 21(5): 051201
- Chinese Optics Letters
- Vol. 21, Issue 5, 051201 (2023)
Fig. 1. (a) Schematic of the proposed sensor. Cross-sectional microscope view of (b) RCF and (c) MMF.
Fig. 2. Propagation field distribution with different structures. (a) SMF–RCF–SMF; (b) SMF–MMF–RCF–SMF; and (c) SMF–MMF–RCF–MMF–SMF.
Fig. 3. Schematic diagram of the refractive index distribution of straight and bending fibers. The inset shows simulation results of the light field distribution at Z = 6500 µm.
Fig. 4. (a) Measured transmission spectrum; (b) FFT of measured spectrum.
Fig. 5. Mode field distribution are obtained by using FEM. (a) LP21; (b) LP31; (c) LP29.
Fig. 6. Experimental setup for the curvature measurement.
Fig. 7. (a) Interference dip (at 1450 nm) evolution with different curvatures; (b) average wavelength-bending response with error bars for four testing results; the inset shows linear fitting of the four measurements.
Fig. 8. Average intensity-bending response with error bars for four testing results; the inset shows the linear fitting of the four measurements.
Fig. 9. (a) Spectral responses under different temperatures; (b) wavelength and intensity response to temperature.
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Table 1. Performance Comparison between Our Sensors and Other Sensors
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