Hello Lintang,
Are you able to share with us your osd (OptiSystem design) file? The answer will depend on what you are labelling WDM System. THe WDM Analyzer requires access to noise bins so these must exist. While this is true in the WDM systems it is also present in other modulation setups. If you review the samples folder installed with the product “Documents\OptiSystem 22.0 Samples” and review the Advanced modulation systems you will find multiple examples of the WDM Analyzer tools used. For example within the QAM section review the design “8DWDM Channels 112Gbps Coherent DP-16QAM_Trans with DSP.osd”.
Regards,
Scott