... GHz DWDMTypeMuxDemuxChannel No.4/8/16Center Wavelength, nmCh 21~60 or ITU Standard (customer specify)Channel Spacing, nm0.8Channel Spacing ... dB for 4 channel≤2.5Insertion Loss, dB for 8 channel≤3.5Insertion Loss, dB for 16 channel≤4.5Adjacent Channel Isolation, dBN ... / A ≥25Non-adjacent Channel Isolation, dBN ...