Fig. 1. System structure and optical spectra at different positions of photonic arbitrary waveform generation scheme. (a) Structure of the proposed system; (b) optical spectra of generating square, trapezoid, and triangular waveforms; (c) optical spectra of generating sawtooth waveform

Fig. 2. Relationship between RMSE curves of each waveform and number of Fourier series components.（a）Triangular waveform；（b）sawtooth waveform；（c）square waveform；（d）trapezoid waveform

Fig. 3. Time-frequency diagrams of triangular waveform with different repetition rate. (a)(e) 10 GHz; (b)(f) 15 GHz; (c)(g) 20 GHz; (d)(h) 25 GHz

Fig. 4. Time-frequency diagrams of trapezoid waveform with different repetition rate. (a)(e) 10 GHz; (b)(f) 15 GHz; (c)(g) 20 GHz; (d)(h) 25 GHz

Fig. 5. Time-frequency diagrams of square waveform with different repetition rate. (a)(e) 10 GHz; (b)(f) 15 GHz; (c)(g) 20 GHz; (d)(h) 25 GHz

Fig. 6. Time-frequency diagrams of sawtooth waveform with different repetition rate. (a)(e) 10 GHz; (b)(f) 15 GHz; (c)(g) 20 GHz; (d)(h) 25 GHz

Fig. 7. Triangular and trapezoid waveforms within β in the standard value ±0.15 range. (a) Power difference and RMSE; (b) triangular waveform; (c) trapezoid waveform

Fig. 8. Power difference and RMSE of square and sawtooth waveforms within β in the standard value ±0.15 range.（a）Square waveform；（b）sawtooth waveform

Fig. 9. Triangular wave and trapezoid waveforms within Δθ in the ±3° range. (a) Power difference and RMSE; (b) triangular waveform; (c) trapezoid waveform

Fig. 10. Power difference and RMSE of square and sawtooth waveforms within Δθ in the ±3° range.（a）Square waveform；（b）sawtooth waveform