Fig. 1. A multi-band, large-bandwidth LFM signal parallel generation system based on an OFOM. (a) Schematic diagram; (b) spectrum of signal after first stage phase modulation; (c) spectrum of signal after first stage phase modulation and optical filtering; (d) spectrum of signal after second stage phase modulation; (e) spectrum of signal after second stage phase modulation and optical filtering

Fig. 2. Amplitude variation for the first kind of Bessel function Jnβ (n∈N+ and β∈R+)

Fig. 3. Physical diagram of multi-band radar signals with arbitrary bandwidth based on OFOM. (a) System diagram; (b) enlarged diagram of the OFOM

Fig. 4. R_RFSS variations under different modulation indices for the first and second stage phase-modulated optical sidebands with orders N=5 and M=4

Fig. 5. Spectra and time-frequency diagrams of the signal from the first branch in experiments 1 to 6. (a) Spectra of generated signals; (b) time-frequency diagram of 2.4 MHz bandwidth signal; (c) time-frequency diagram of 6 MHz bandwidth signal; (d) time-frequency diagram of 12 MHz bandwidth signal; (e) time-frequency diagram of 30 MHz bandwidth signal; (f) time-frequency diagram of 300 MHz bandwidth signal; (g) time-frequency diagram of 600 MHz bandwidth signal

Fig. 6. Time-frequency diagrams of LFM signals from the second branch in experiments 7 to 10. (a) X-band pulse signal spectrum; (b) C-band pulse signal spectrum; (c) S-band continuous signal spectrum; (d) L-band continuous signal spectrum; (e) time-frequency diagram of X-band pulse signal with a duty ratio of 10%; (f) time-frequency diagram of C-band pulse signal with a duty ratio of 50%; (g) time-frequency diagram of S-band continuous signal swept at a period of 100 µs; (h) time-frequency diagram of L-band continuous signal swept at a period of 1000 µs

Fig. 7. Generation of low-frequency broadband LFM signals from the second branch in experiment 10. (a) Time-frequency diagram; (b) time domain diagram after matched filtering