This DWDM 4 skip 0 band filter is 3 ports passvie optical component based on TFF (Thin Film Filter) technology, which can split 4 DWDM wavelength into PASS port, and other wavelengths go to REFLECT port.  HyOptic can supply DWDM band filters ITU Grid 100GHz, 200GHz

Features
Low insertion loss
High isolation
Operating temperature -40 to 85 °C
Telcoredia GR-1209-CORE and GR-1221-CORE
PCT 168 hours reliability

Parameters	Unit	Limited Value
Pass  Insertion Ioss	dB	≤0.8
Reflect Insertion Loss	dB	≤0.4
PDL(Polarization Dependent Loss)	dB	≤0.1
Pass Isolation	dB	≥25
Reflect Isolation	dB	≥12
Return Loss	dB	≥45
Directivity	dB	≥55