Photonic generation of Ka/W dual-band frequency-hopping linearly chirped microwave waveforms with alternating chirp directions

We propose a photonic approach for generating Ka/W dual-band frequency-hopping linear chirped microwave waveforms (FH-LCMWs) with alternating chirp directions, using carrier-suppressed single-sideband modulation, optical frequency-comb selection, and high-speed optical switching. Ka/W dual-band FH-LCMWs with alternating chirp directions are generated over the 31 to 35 and 91 to 95 GHz frequency ranges, respectively, achieving a frequency-hopping span of 60 GHz. By setting the switching period to half of the triangular chirp period, alternating outputs with opposite chirp slopes are obtained. Simulation results show good power balance and spectral flatness in both bands. The ambiguity function exhibits a thumbtack-like profile with 3-dB delay and Doppler resolutions of 4.2 ns and 45.4 MHz, respectively. The proposed scheme provides an effective solution for broadband radar and high-speed wireless communication applications.