Fig. 4: Demonstration of the frequency-comb-steered two-dimensional quasi-TTD beamformer. | Nature Communications

Fig. 4: Demonstration of the frequency-comb-steered two-dimensional quasi-TTD beamformer.

From: Frequency-comb-steered ultrawideband quasi-true-time-delay beamformer for integrated sensing and communication

Fig. 4

a Experimental setup. Four CW lasers are multiplexed and seed the generation of signal and LO combs. In the signal path, the signal comb is modulated by an intermediate-frequency LFM. In the LO path, two stages of EO comb generators are employed, responsible for the generation of x- and y-axis LO combs. The dual combs are then amplified, demultiplexed, and heterodyned to generate LFM signals that feed a 4×4 microstrip antenna array. b Optical spectra of the four sets of dual combs. The sixteen highlighted channels are selected for the beamforming test.

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