Fig. 4: System-coordinated wireless spectrum management.
From: Ultrabroadband on-chip photonics for full-spectrum wireless communications
a, Schematic of spectral self-adaptation. b, Non-ideal frequency response of the wireless channels in the experiment. c, Optical spectra distortion of the loaded signals for wireless carrier frequencies of 80 GHz (top panel) and 98 GHz (bottom panel), respectively. d, Measured BERs of 120 Gbps 16-QAM signal in different frequency channels. e, Schematic of the setup and principle of active interference avoidance. f,g, Baseband power spectra and demodulated constellation diagrams in the cases of jammed (insets i–v) and separated (insets vi–x) signals at initial frequencies of 25 GHz (f) and 96.55 GHz (g). Insets (i) and (vi) show the power spectral density of the target and interference signals in respective cases. Insets (ii–v and vii–x) show demodulated constellation diagrams and BERs. h, Schematic of frequency alignment between target signal and LO. i, BER versus frequency offset for four types of signals.
