An overview of some of our results on the intercore crosstalk (ICXT) induced in weakly-coupled multicore fiber (WC-MCF) systems is presented. The random evolution of the ICXT
over time observed experimentally in WC-MCFs is characterized and the correlation between the ICXT field components induced by multiple interfering cores is investigated. The impact of the ICXT on the outage probability of on-off keying direct-detection WC-MCF systems, with |skew×bit rate | ≪ 1 and |skew×bit rate | ≫ 1, is assessed as well. It is shown that the ICXT power
induced by multiple interfering cores is adequately modelled by a χ2 distribution with four degrees of freedom. This means that the ICXT Gaussian field components are ncorrelated or weakly correlated. The measurements of the system performance show that, for the same outage probability, systems with |skew×bit rate | ≫ 1 present an additional ICXT tolerance of about 3 dB compared with systems with |skew×bit rate | ≪ 1.