Zhe Liu, Xihua Zou, Puyu Liu. Sensitivity Enhancement of Fiber Laser Sensors Using Four-Wave Mixing[J]. Laser & Optoelectronics Progress, 2019, 56(17): 170632
- Laser & Optoelectronics Progress
- Vol. 56, Issue 17, 170632 (2019)
Fig. 1. Schematic of experimental setup
Fig. 2. Schematic of light evolution in FWM generation process
Fig. 3. Reflection spectra of grating used in experiment. (a) Reflection spectrum of CFBG; (b) reflection spectrum of PM-FBG
Fig. 4. Output spectral results of experiment. (a) Output spectrum of section A; (b) output spectrum of section A within 50 min; (c) output spectrum of section B; (d) output spectrum of section B within 50 min
Fig. 5. Spectral changes in temperature rising. (a) Output spectra of sensitivity-enhancement device at different temperatures; (b) changes in wavelength difference
Fig. 6. Responses of temperature sensing. (a) Pump wavelength difference Δλp; (b) 1st-FWM wavelength difference Δλ1; (c) 2nd-FWM wavelength difference Δλ2; (d) 3rd-FWM wavelength difference Δλ3
Fig. 7. Package structure of PM-FBG
Fig. 8. Responses of output wavelength to axial strain. (a) Output spectra of system at different strains; (b) λp and λs as functions of axial strain
Fig. 9. Responses of axial strain. (a) Pump wavelength difference Δλp; (b) 3rd-FWM wavelength difference Δλ3
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Table 1. Temperature sensitivities for four types of wavelength differences and parameters for their fitting curves
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