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We propose a model, for the first time, to quantitatively estimate theintercore spontaneous Raman scattering (ICSRS) in multicore fber (MCF) based onthe characterization of intercore crosstalk (ICXT). Also, we show the propertisof ICSRS through numerical simulations. Then the impact of ICSRS on quantum keydistribution (QKD) is evaluated. It is revealed that both the forward-ICSRS andbackwardICSRS will reduce the maximum transmisson distance and theforward-ICSRS will reduce more. However, over the range of metropolitan areanetworks, quantum signals are affected only when the powers of classicalsignals are very high in dense wavelength division multiplexing system.Finally, the spontaneous Raman scattering (SRS) generated in single core fiberand the ICSRS generated in MCF are compared. The power variety trend with thetransmission distance of SRS is similar to that of ICSRS, though there aresubtle differences.

Intercore spontaneous Raman scattering impact on quantum key distribution in multicore fber