Fig. 1. Schematic diagram of the microwave FPSK signal generation. RF: radio frequency; PM: phase modulator; PolM: polarization modulator; OC: optical coupler; LO: local oscillator

Fig. 2. Schematic diagram of generating and transmitting FPSK signal in radio over frequency system. (a) Transmission characteristic curve of PM-FBG. SMF: single mode fiber; PC: polarization controller

Fig. 3. FPSK signal. (a) Optical spectrum of optical signal; (b) frequency spectrum of microwave signal

Fig. 4. Temporal waveform of the FPSK signal with carrier frequencies of (a) 12.5 GHz and (b) 9.5 GHz

Fig. 5. (a) Flow chart of digital signal process;(b) eye-diagram of FSK signal; constellations of 9.5 GHz signal (c) before and (d) after phase correction; constellation of 12.5 GHz signal (e) before and (f) after phase correction