Fig. 1. Structure of phase-shifted fiber gratings

Fig. 2. Amplitude-frequency response and phase-frequency response of phase-shifted fiber grating. (a) Amplitude-frequency and (b) phase-frequency responses of first-order phase-shifted fiber grating; (c) amplitude-frequency and (d) phase-frequency responses of second-order phase-shifted fiber grating

Fig. 3. Integral test of phase-shifted fiber gratings. (a) First-order phase-shifted fiber grating; (b) second-order phase-shifted fiber grating

Fig. 4. Structure of the pulse shaper

Fig. 5. First-order integral of Gaussian pulses

Fig. 6. Flat-topped pulse after shaping. (a) Time domain; (b) frequency domain

Fig. 7. (a) Input Gaussian pulse; (b) triangular pulse after shaping

Fig. 8. Asymmetric triangular pulse. (a) k1=1, k2=-2; (b) k1=2, k2=-1

Fig. 9. Effect of the input signal fluctuation on the output pulse. (a) Flat-topped pulse; (b) triangular pulse