Fig. 8: The analysis of the optical response properties while being eavesdropped. | Nature Communications

Fig. 8: The analysis of the optical response properties while being eavesdropped.

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

Fig. 8

a The top-view microscope when coupling 655 nm signal light with external 532 nm wavelength light pumping in; b the output optical field of the signal source and the curve of relative gain versus different pumping light power intensity; (c) to (e) are the input/output response square-wave with pulse-code modulation for 532 nm wavelength pseudo-code information; (f) to (h) are the input/output response square-wave with pulse-code modulation for 655 nm wavelength pulse-code information.

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