Fig. 1. (A) Schematic diagram and (B) principle of the proposed SBS-based arbitrarily phase coded microwave waveform transmitter.

Fig. 2. Measured optical spectra at the output of (a) DPDDMZM, (b) MZM, (c) HNLF, and (d) OBPF.

Fig. 3. (a) Time-domain waveform, (b) extracted phase information, (c) electrical spectrum, and (d) autocorrelation of the generated π phase coded microwave signal with RF carrier of 8 GHz and bit rate of 2 Gb/s.

Fig. 4. (a), (c), (e) Time-domain waveform and (b), (d), (f) extracted phase information of the generated 2 Gb/s at 8 GHz phase coded microwave signal with phase coding degrees of 130°, 80°, and 30°, respectively.

Fig. 5. (a), (d) Time-domain waveform, (b), (e) extracted phase information, and (c), (f) autocorrelation of the recovered 2 Gb/s at 8 GHz π phase coded signal after 25 km SMF transmission and optical attenuator.

Fig. 6. (a) Time-domain waveform, (b) extracted phase information, (c) electrical spectrum, and (d) autocorrelation of the generated π phase coded microwave signal with RF carrier of 16 GHz and bit rate of 4 Gb/s. (e), (g), (i) Time-domain waveform and (f), (h), (j) extracted phase information of the generated 4 Gb/s at 16 GHz phase coded microwave signal with phase coding degrees of 130°, 80°, and 30°, respectively.

Fig. 7. (a), (d) Time-domain waveform, (b), (e) extracted phase information, and (c), (f) autocorrelation of the recovered 4 Gb/s at 16 GHz π microwave signal after 25 km SMF transmission and optical attenuator, respectively.