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. 2022 Jul 14;13:4090. doi: 10.1038/s41467-022-31590-z

Fig. 6. Experimental study of the ADM circuits for THz communications.

Fig. 6

Eye patterns for the THz signals of different bit rates and different carrier frequencies propagating through a an ADM circuit with the optimized Drop action and b an ADM circuit with the balanced Add/Drop action. The measurements were performed at the following ports: (I–III) Drop port, (IV) Through port (Drop action: In port launch within grating stopband); (V–VII) Through port, (VIII) In port (Add action: Add port launch within grating stopband); (IX–XI) Through port, (XII) Drop port (Through action: In port launch within grating passband). The measurements are performed at various frequencies in the grating stopband (143, 148, 151 GHz) and the grating passband (128 GHz), which are also marked by black stars in Fig. 5. c Measured BER versus bit rate of the THz carrier wave propagating through two optimized ADM circuits.