Fig. 3: De-chirped signal using the FMCW waveform generated by the time-variant PT-symmetric and conventional FDML OEO.
From: Time-variant parity-time symmetry in frequency-scanning systems
a Schematic diagram of the de-chirp processing link. Illustrations of the instantaneous frequency-time diagram and de-chirped signal of b the time-variant PT-symmetric FDML OEO and c a conventional FDML OEO. Spectra of the de-chirped signal of d the time-variant PT-symmetric FDML OEO and e a conventional FDML OEO. Insert: Zoom-in view showing the 3-dB bandwidth of the de-chirped signal. Details of the de-chirped signal corresponding to f the time-variant PT-symmetric FDML OEO and g a conventional FDML OEO. RBW: resolution bandwidth.
