Fig. 1. Structural diagrams of transmitter and receiver in photonic frequency-hopping system, along with optical spectra of signals at each stage. (a) System structure diagram; (b) local oscillator optical frequency comb; (c) carrier optical frequency comb; (d) selected local oscillator signal; (e) selected carrier signal; (f) modulated signal; (g) combined signal after multiplexing

Fig. 2. Principle of frequency hopping and de-hopping

Fig. 3. Optical spectra of optical frequency comb. (a)(b) Transmitter; (c)(d) receiver

Fig. 4. Optical spectra of signal after carrier-suppressed single-sideband modulation. (a) Single-tone signal; (b) broadband signal

Fig. 5. Spectra of frequency-hopping channels

Fig. 6. Time-frequency diagram of adjacent channel switching

Fig. 7. Measured channel balance and constellation diagram. (a) Transmitter; (b) receiver

Fig. 8. EVM variation curves under different CNRs

Fig. 9. BER curves at different receiver powers and constellation diagrams for each channel