19CH O C Band DWDM Module 8 11 Channel 200GHz 100GHz LC PC G657A1 Low Loss Fiber Optic WDM 19CH O+C-Band DWDM Module 1. Product Description The 19CH O+C-Band DWDM Module is a multi-wavelength passive optical component designed to combine O-band and C-band wavelength channels within a single compact module. It integrates 8 O-band channels and 11 C-band channels , providing a total of 19 wavelength channels for optical multiplexing and demultiplexing applications. 2. Product