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. 2020 Jan 21;11:406. doi: 10.1038/s41467-019-14249-0

Fig. 4. Experimental results with photonic FPDA signal processor operating as optical beamforming network.

Fig. 4

a Measured transmission spectrum of the channel from port 4 to port 9 when the voltages are controlled to make resonance wavelength of each MDR aligned progressively. b Measured time delays with the number of the aligned MDRs increasing progressively. c Calculated array factors of a four-element linear PAA when the channel time delay is 13.5 ps. d Calculated array factors of a four-element linear PAA when the channel time delay is 26.4 ps.