Fig. 7: Model-based analysis of SpRS noise and SKR. | Light: Science & Applications

Fig. 7: Model-based analysis of SpRS noise and SKR.

From: Integration of quantum key distribution and high-throughput classical communications in field-deployed multi-core fibers

Fig. 7: Model-based analysis of SpRS noise and SKR.The alternative text for this image may have been generated using AI.

a Power spectral density of forward and backward Raman noise as a function of fiber length. b Power spectral density of IC-SpRS noise versus fiber length. c Secure key rate as a function of channel attenuation. Quantum signal is always in channel 69 for Fig. (a–c). d Power spectral densities of the Raman noise processes XT-FRS, FRS-XT, XT-BRS, and BRS-XT for a quantum signal in channel 69 (marked by a vertical line), versus the classical channel wavelength. e Raman PSD versus the quantum-signal wavelength. f Secure key rate versus the quantum-signal wavelength. The fiber length is set to 25.2 km in all cases

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