1. Product Title 19CH O+C-Band DWDM Module – 8CH O-Band 200GHz + 11CH C-Band 100GHz 2. Product Overview The GracyFiber 19CH O+C-Band DWDM Module combines eight O-band wavelength channels and eleven C-band wavelength channels through a single COM interface. The module operates across 1260–1360 nm and 1525–1575 nm , using 200 GHz spacing in the O-band and 100 GHz spacing in the C-band . The documented configuration provides a maximum COM-to-channel insertion loss of 3.60 dB ,