Hello Muhammad,
it is not common to use the term ASE spikes.
ASE bandwidth can be controlled using optical bandpass filters. ASE can be generated using white source, LED, or EDFA without signal at its input. OptiSystem have the required components to adjust the ASE level in certain bandwidth for controlling OSNR at the receiver or at any place in the transmission link. Many examples can be found in the example library of OptiSystem.
Regards,
Ahmad