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

中文翻译：

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芯间自发拉曼散射对多芯光纤中量子密钥分布的影响

我们首次提出了一种模型，用于基于芯间串扰 (ICXT) 的表征来定量估计多芯光纤 (MCF) 中的芯间自发拉曼散射 (ICSRS)。此外，我们通过数值模拟展示了 ICSRS 的特性。然后评估ICSRS对量子密钥分发（QKD）的影响。结果表明，前向ICSRS和后向ICSRS都会减少最大传输距离，而前向ICSRS会减少更多。然而，在城域网范围内，只有在密集波分复用系统中经典信号的功率非常高时，量子信号才会受到影响。最后，比较了单芯光纤中产生的自发拉曼散射 (SRS) 和 MCF 中产生的 ICSRS。