It seems to be a relatively small amount (about -100dBm). You might want to refer to the amount in the table which is 0 dBm for input power equal to 0 dBm. But this might be a case different from the one whose results are there in the table. This might be the same case as one of the simulations in the figure 11, for example, whose FWM power level is around -100 dBM for input power equal to 0 dBm.