DWDM Optical Add/Drop multiplexer (OADM) is a passive optical device used in WDM networks for adding and dropping one or more 100 GHz DWDM channels in the C-band into one or two fibers, while allowing the rest of the wavelengths bypass to the desired destination. DWDM OADM modules are available in single-sided (east or west) and dual-sided (east and west) configurations up to 2 channels. AscentOptics provide high performance DWDM OADM modules, including dual fiber 2 channels and single fiber 1 channel, packaged in LGX box.