Fig. 1. Theoretical block diagram of SFFT

Fig. 2. Cavity length demodulation system of fiber F-P sensor

Fig. 3. Interference spectrum of FFP-TF

Fig. 4. (a) Simulation results of signal; (b) simulation results of signal spectrum

Fig. 5. FFT spectra of interference signal

Fig. 6. SFFT spectra at different sparsity values. (a) K=800; (b) K=400; (c) K=40; (d) K=4; (e) K=2

Fig. 7. FFT spectrum of interference signal when FFP-C voltage is 40 V

Fig. 8. SFFT spectrum of interference signal when FFP-C voltage is 40 V

Fig. 9. Run time versus signal sparsity K

Fig. 10. Runtime versus signal length N