The relative average inter-core crosstalk (IC-XT) among wavelength-division multiplexed (WDM) optical channels in a quasi-homogeneous two-core fiber system exhibiting slight differences on the propagation constant, inverse group-velocity, and the group-velocity dispersion (GVD) between cores is numerically investigated. This analysis is performed using a theoretical formalism that includes fiber nonlinearities in the presence of random perturbations. The results show oscillations on the average IC-XT of WDM channels that mainly depend on the walk-off between cores. These oscillations arise superimposed to the linear wavelength-dependence of the IC-XT caused by the core-coupling coefficient. As transmission power increases, the nonlinearities do not reduce the presence of these oscillations, but slightly modify their amplitudes and periods. These results provide valuable information to fully understand the wavelength dependence of the average IC-XT of real multi-channel MCF systems, especially those of very short reach.

中文翻译：

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准同质多芯光纤中WDM通道的串扰特性


准同质双芯光纤系统中波分复用 (WDM) 光通道之间的相对平均芯间串扰 (IC-XT)，在传播常数、反群速度和群速度方面表现出细微差异对纤芯之间的色散（GVD）进行了数值研究。该分析是使用理论形式进行的，其中包括存在随机扰动的情况下的光纤非线性。结果显示 WDM 通道的平均 IC-XT 振荡主要取决于内核之间的走离。这些振荡叠加到由纤芯耦合系数引起的 IC-XT 的线性波长依赖性上。随着传输功率的增加，非线性不会减少这些振荡的存在，但会稍微改变它们的幅度和周期。这些结果为充分了解实际多通道 MCF 系统（尤其是非常短距离的系统）的平均 IC-XT 的波长依赖性提供了有价值的信息。