Fig. 1. Spectra simulated by asymmetrical Gaussianmodel. (a) P(λ); (b) P_c(λ)

Fig. 2. Function curves of P_c(λ) and odd function of its decomposition. (a) P_c(λ) and P_c(-λ); (b) P_co(λ)

Fig. 3. Zero filling before and after spectral signal x(n). (a) Before x(n), when i<N/2; (b) behind x(n),when i>N/2

Fig. 4. Flow chart of the proposed algorithm

Fig. 5. Central wavelengths of the FBG spectra of asymmetrical Gaussian models with different algorithms

Fig. 6. Central wavelengths of spectra of asymmetrical Gaussian model under different SNR with different algorithms. (a) SNR: 0.5 dB; (b) SNR: 1.0 dB; (c) SNR: 5.0 dB; (d) SNR: 10.0 dB

Fig. 7. Block diagram of experimental system

Fig. 8. Linear fitting results of centralwavelengths by each algorithm