Fig. 7: The message transmission protecting system and measuring method of the dual-layer encryption waveguide device. | Nature Communications

Fig. 7: The message transmission protecting system and measuring method of the dual-layer encryption waveguide device.

From: Dual-layer optical encryption fluorescent polymer waveguide chip based on optical pulse-code modulation technique

Fig. 7: The message transmission protecting system and measuring method of the dual-layer encryption waveguide device.The alternative text for this image may have been generated using AI.

a The scheme to detect eavesdropping for the waveguide chip; b the output signal powers from the receiver port pumped externally by 30, 50, 70, and 100 mW at 405 nm wavelength, respectively.

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